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  • Random Haswell BSOD Problems

    I have been getting a BSOD Error (Locale ID) 1033 recently and have the mini dump and XML information available (hopefully I link it correctly into the forum). When I check my event viewer I find something along the lines of a Kernel power issue. It states "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly." I believe it is a power supply issue as I have had some stutter in my games at times followed by my screen going blank and nvidia control panel recovering from a kernel power failure (going off what I remember, not sure if that's what it stated). I have had my PSU for about 4 years now. Can anybody give me a second opinion or look through my mini-dump file to tell me what is wrong? All my hardware is running at stock factory speed and the system load at which it crashes seems to have no difference (whether or not what I'm doing is intensive, it crashed randomly).
    Attached Files
    Last edited by 760slayer; 12-30-2013, 04:40 AM. Reason: Pasted Incorrectly
    Microsoft Windows 7 Pro x64 (SP1) - OS
    Intel i5-4670k Processor - CPU
    MSI Z87-G45 - Motherboard (BIOS version 1.6)
    Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
    Antec TRUEPOWER QUATTRO 1000W - PSU
    MSI GTX770 N770 TF 2GD5/OC - GPU
    CM Storm Trooper Full Tower - Case
    ASUS VH238 23" 60Hz - Monitor

  • #2
    re: Random Haswell BSOD Problems

    Your problem might be due to using an older power supply that isn't fully compatible with Haswell computer systems.
    Can you borrow a recent good quality power supply to test with instead of using your four year old psu?

    Does your system immediately restart after a BSOD occurs?
    If yes, change the system setting so that your system will remain on the BSOD screen so that you can post a picture of the BSOD screen.
    Go to Control Panel --> System --> Advanced system settings --> click on the Advanced tab, click on Settings in the Startup and Recovery section and then uncheck the Automatically restart box in the System failure section. Don't allow the system settings to overwrite any existing dumps. Click OK when you are done and restart your system.

    The easiest way to start is when we know the stop or bug check code that looks similar to: 0x0000009F, sometimes abbreviated as 0x9F in this example.
    There will often be other useful information displayed in the BSOD screen.

    Download, install and run Resplendence Software - WhoCrashed, automatic crash dump analyzer freeware and upload the report in your next post.

    There are several other dump debugging programs that can also be used.
    Once I know the major BSOD bug check code, I can often do a web search using: bsod followed buy the specific 0x?? code.

    Sample WhoCrashed report:



    Sample BSOD screen:
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .

    Comment


    • #3
      re: Random Haswell BSOD Problems

      Click image for larger version

Name:	WhoCrashed.jpg
Views:	1
Size:	144.5 KB
ID:	754064
      Hopefully I link that correctly, I don't visit the forums all too often. Anyhow my PSU not being officially Haswell ready was a concern for me before I even upgraded, but according to The big Haswell PSU compatibility list - The Tech Report - Page 1 my PSU is confirmed to work with the Haswell chips. I will link an image of the BSOD screen next time it occurs.
      Microsoft Windows 7 Pro x64 (SP1) - OS
      Intel i5-4670k Processor - CPU
      MSI Z87-G45 - Motherboard (BIOS version 1.6)
      Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
      Antec TRUEPOWER QUATTRO 1000W - PSU
      MSI GTX770 N770 TF 2GD5/OC - GPU
      CM Storm Trooper Full Tower - Case
      ASUS VH238 23" 60Hz - Monitor

      Comment


      • #4
        re: Random Haswell BSOD Problems

        So I had to leave the house for a few hours and decided to run a test. I set IntelBurnTest to run 15 cycles at a stress level of high and chose to have the results output to a log that I could check when I got back. I started the test before leaving home at 7:56PM, as of 8:05PM the test finished successfully according to the log. I walked in the door around 11PM and saw my computer frozen with a black screen, no BSOD but fully locked up, according to my LCD on my G510 keyboard it froze at 10:08PM. This would have given the system time to go into idle after the stress test, I think the CPU would have droped into its C7 state using much less power. It if makes a difference I only put my computer to sleep (I know this uses the C7 state) and it never has an issue waking from sleep, I rarely shutdown however I do restart from time to time just because. So it doesn't seem to make a difference whether the system is under load or not, seeing as it has also crash in games where I know the system is under a fairly intensive load. I still believe it is the PSU but I'm not sure whether it has anything to do with the Haswell C7 state or not.I haven't been able to get a capture of the BSOD screen to post yet, just giving some more info to see what others thoughts are.
        Microsoft Windows 7 Pro x64 (SP1) - OS
        Intel i5-4670k Processor - CPU
        MSI Z87-G45 - Motherboard (BIOS version 1.6)
        Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
        Antec TRUEPOWER QUATTRO 1000W - PSU
        MSI GTX770 N770 TF 2GD5/OC - GPU
        CM Storm Trooper Full Tower - Case
        ASUS VH238 23" 60Hz - Monitor

        Comment


        • #5
          re: Random Haswell BSOD Problems

          Click image for larger version

Name:	IMG_20131231_032939.jpg
Views:	1
Size:	145.2 KB
ID:	754065
          Here is a pic of my BSOD.
          Microsoft Windows 7 Pro x64 (SP1) - OS
          Intel i5-4670k Processor - CPU
          MSI Z87-G45 - Motherboard (BIOS version 1.6)
          Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
          Antec TRUEPOWER QUATTRO 1000W - PSU
          MSI GTX770 N770 TF 2GD5/OC - GPU
          CM Storm Trooper Full Tower - Case
          ASUS VH238 23" 60Hz - Monitor

          Comment


          • #6
            re: Random Haswell BSOD Problems

            Oh happy days, multiple random BSODs:
            • 0x7E - SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (from BSOD screen-shot)
            • 0x1E - KMODE EXCEPTION NOT HANDLED (2 reports on 12/30/w013 at 10:16:45 AM)
            • 0xD1 - DRIVER IRQ NOT LESS THAN OR EQUAL
            • 0x3B - SYSTEM SERVICE EXCEPTION

            Let's assume for now that your power supply is not part of the problem.
            I suspect that enabling some of the c-states might be the problem.
            Try disabling one c-state at a time, starting with the highest numbered c-state and re-test.
            This should be easier than testing your system with a different power supply.

            Some web searches that will provide additional information:
            • bsod ???? (where ???? is the bugcheck code number, using the 0x-- format)
            • bsod haswell c-state

            Windows 7 Help Forums is an excellent site and BSOD Help and Support - Windows 7 Help Forums is an excellent starting point.

            Some other programs that might provide additional useful information: Blue screen of death (STOP error) information in dump files.
            BlueScreenView v1.52
            Copyright (c) 2009 - 2013 Nir Sofer

            Related Utilities:
            • WinCrashReport - Displays a report about crashed Windows application.
            • WhatIsHang - Get information about Windows software that stopped responding (hang)
            • AppCrashView - View application crash information on Windows 7/Vista.
            • WhatInStartup - Enable/Disable/Delete the programs that run at Windows Startup.
            Last edited by profJim; 12-31-2013, 04:44 AM.
            Q9650 @ 4.10GHz [9x456MHz]
            P35-DS4 [rev: 2.0] ~ Bios: F14
            4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
            MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
            Seasonic SS-660XP2 80 Plus Platinum psu (660w)
            WD Caviar Black WD6401AALS 640GB (data)
            Samsung 840 Pro 256GB SSD (boot)
            SLI @ 16/4 works when running HyperSLI
            Cooler Master 120XL Seidon push/pull AIO cpu water cooling
            Cooler Master HAF XB computer case (RC-902XB-KKN1)
            Asus VH242H 24" monitor [1920x1080]
            MSI N460GTX Hawk (1GB) video card
            Logitech Z-5500 Digital 5.1 Speakers
            win7 x64 sp1 Home Premium
            HT|Omega Claro plus+ sound card
            CyberPower CP1500PFCLCD UPS
            E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
            Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
            Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
            HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
            win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
            .

            Comment


            • #7
              re: Random Haswell BSOD Problems

              Originally posted by 760slayer View Post
              I have been getting a BSOD Error (Locale ID) 1033 recently ......
              Recently, as in the system was running fine prior? Or it's a new build?

              Also, your 16GB(4x4GB) HyperX Blu. Since I can't locate a 4x4GB kit, is it actually comprised of two 8GB(2x4GB) kits?

              XMP in the BIOS or have you set their timings manually?

              Have you recently flashed to a newer/updated motherboard BIOS revision?

              Originally posted by profJim View Post
              Oh happy days, multiple random BSODs:
              • 0x7E - SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (from BSOD screen-shot)
              • 0x1E - KMODE EXCEPTION NOT HANDLED (2 reports on 12/30/w013 at 10:16:45 AM)
              • 0xD1 - DRIVER IRQ NOT LESS THAN OR EQUAL
              • 0x3B - SYSTEM SERVICE EXCEPTION
              #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
              ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.


              #2 - Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

              Comment


              • #8
                re: Random Haswell BSOD Problems

                Recently had been within the last month or so, variable. I seem to have solved my issue over at the forum on the Microsoft Community. It was a driver issue and had nothing to do with my PSU, yet I still have my doubt about how long my PSU has left. Just in case your still wondering the model of my RAM kit was KHX1600C9D3K4/16GX. I never enabled any C-states other than what the MB-BIOS initially has enabled. XMP was enabled and I had just flashed my BIOS with an update a few days ago. As I said my problem has been solved. I could be wrong and maybe my system just hasn't decided to surprise me with another blue screen yet, but it has seems to be stable since my last post. For the record I know my PSU it major overkill for my components. I bought it back four years ago when it was pushing much different hardware and at the time I didn't know what I needed. I really only need a good 600W PSU, but I've already got this, until it goes out at-least. Unless there is a reason to change anything else I believe my system is up and running as it should once again, thanks for the help guys.
                Last edited by 760slayer; 01-02-2014, 12:06 PM.
                Microsoft Windows 7 Pro x64 (SP1) - OS
                Intel i5-4670k Processor - CPU
                MSI Z87-G45 - Motherboard (BIOS version 1.6)
                Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
                Antec TRUEPOWER QUATTRO 1000W - PSU
                MSI GTX770 N770 TF 2GD5/OC - GPU
                CM Storm Trooper Full Tower - Case
                ASUS VH238 23" 60Hz - Monitor

                Comment


                • #9
                  re: Random Haswell BSOD Problems

                  You're welcome, glad to hear that your BSOD problem seems to be fixed.
                  It's amazing how providing detailed information and letting BSOD experts look over the information helps to quickly solve the problem.

                  I think that your psu is highly rated and should have several more years of useful life left in it.
                  eXtreme Power Supply Calculator is a very useful site to determine the proper power output level for your system and the RealHardTechX PSU Review Database site can help you find information about who really made your psu model and they provide psu review links to some of the best psu review sites.

                  If you want, I can change the thread title to Random Haswell BSOD Problems (or something similar) that better describes the problem.
                  The BSOD 1033 part of thread title has no meaning.

                  Thanks for the update.
                  Q9650 @ 4.10GHz [9x456MHz]
                  P35-DS4 [rev: 2.0] ~ Bios: F14
                  4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
                  MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
                  Seasonic SS-660XP2 80 Plus Platinum psu (660w)
                  WD Caviar Black WD6401AALS 640GB (data)
                  Samsung 840 Pro 256GB SSD (boot)
                  SLI @ 16/4 works when running HyperSLI
                  Cooler Master 120XL Seidon push/pull AIO cpu water cooling
                  Cooler Master HAF XB computer case (RC-902XB-KKN1)
                  Asus VH242H 24" monitor [1920x1080]
                  MSI N460GTX Hawk (1GB) video card
                  Logitech Z-5500 Digital 5.1 Speakers
                  win7 x64 sp1 Home Premium
                  HT|Omega Claro plus+ sound card
                  CyberPower CP1500PFCLCD UPS
                  E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
                  Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
                  Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
                  HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
                  win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
                  .

                  Comment


                  • #10
                    re: Random Haswell BSOD Problems

                    Go ahead and change the title of the thread, it may help somebody else find it easier if they run into the same issue. I'm always happy posting here, I always get a quick response that makes for a quick resolution.
                    Microsoft Windows 7 Pro x64 (SP1) - OS
                    Intel i5-4670k Processor - CPU
                    MSI Z87-G45 - Motherboard (BIOS version 1.6)
                    Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
                    Antec TRUEPOWER QUATTRO 1000W - PSU
                    MSI GTX770 N770 TF 2GD5/OC - GPU
                    CM Storm Trooper Full Tower - Case
                    ASUS VH238 23" 60Hz - Monitor

                    Comment


                    • #11
                      re: Random Haswell BSOD Problems

                      Done, the new thread title name will make it easier for others to find in the future.
                      I also added 3 thread tags.

                      BTW, I really like your new forum avatar!!
                      Q9650 @ 4.10GHz [9x456MHz]
                      P35-DS4 [rev: 2.0] ~ Bios: F14
                      4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
                      MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
                      Seasonic SS-660XP2 80 Plus Platinum psu (660w)
                      WD Caviar Black WD6401AALS 640GB (data)
                      Samsung 840 Pro 256GB SSD (boot)
                      SLI @ 16/4 works when running HyperSLI
                      Cooler Master 120XL Seidon push/pull AIO cpu water cooling
                      Cooler Master HAF XB computer case (RC-902XB-KKN1)
                      Asus VH242H 24" monitor [1920x1080]
                      MSI N460GTX Hawk (1GB) video card
                      Logitech Z-5500 Digital 5.1 Speakers
                      win7 x64 sp1 Home Premium
                      HT|Omega Claro plus+ sound card
                      CyberPower CP1500PFCLCD UPS
                      E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
                      Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
                      Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
                      HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
                      win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
                      .

                      Comment


                      • #12
                        re: Random Haswell BSOD Problems

                        Click image for larger version

Name:	BSOD.jpg
Views:	1
Size:	137.5 KB
ID:	754078
                        It seems my BSOD is somewhat of a Phoenix, as soon as one is gone another arises. I suppose I will open another forum on the MS Community as well since the original is closed since I chose an answer. In the mean time if you could tell me anything about this that would be great.
                        Microsoft Windows 7 Pro x64 (SP1) - OS
                        Intel i5-4670k Processor - CPU
                        MSI Z87-G45 - Motherboard (BIOS version 1.6)
                        Kingston HyperX Blu PC3-12800 16GB (4x4GB) DDR3-1600MHz - RAM
                        Antec TRUEPOWER QUATTRO 1000W - PSU
                        MSI GTX770 N770 TF 2GD5/OC - GPU
                        CM Storm Trooper Full Tower - Case
                        ASUS VH238 23" 60Hz - Monitor

                        Comment


                        • #13
                          re: Random Haswell BSOD Problems

                          Are you using any external devices connected to this computer? If so disconnect every thing but the keyboard, mouse, and monitor and see if these BSODs continue, or cease?
                          #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
                          ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.


                          #2 - Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

                          Comment


                          • #14
                            re: Random Haswell BSOD Problems

                            _ So you couldn't stay away from the forum and now you have a different bsod to deal with.

                            BSOD 0x50 = PAGE_FAULT_IN_NONPAGED_AREA is a common error.
                            The bsod screen-shot lists the luafv.sys file as the probable cause.
                            On my win7 Home Premium system, this file is located in the C:\Windows\System32 folder.
                            A web search using: bsod 0x50 luafv.sys provides links that might be helpful.
                            Another useful search is: bsod bugcheck list for quick information and descriptions of individual bsod codes.

                            BSOD 0x50 is a memory related problem but there can be many causes.
                            I don't recall if your cpu and/or memory is overclocked.

                            Make sure that you create a saved bios profile for your current settings.
                            If you have a saved bios profile that you know is not overclocked (and is stable), load this non-o/c'd profile and run with it for a while to see if any bsod's occur.

                            I've had a few 0x50 bsod's on my system from time to time and the fix that worked for me was to "detune" my memory a little or increase Dram voltage settings the smallest amount possible. This approach might work for you and you can try it. I recommend that you open a new bsod debug thread at the Microsoft Community site or at the BSOD Help and Support - Windows 7 Help Forums site.

                            Any questions?

                            Attached is the LUAFV.sys properties information from my system:
                            Click image for larger version

Name:	LUAFV.SYS File Pproperties.png
Views:	1
Size:	27.2 KB
ID:	754079
                            Last edited by profJim; 01-02-2014, 09:33 PM.
                            Q9650 @ 4.10GHz [9x456MHz]
                            P35-DS4 [rev: 2.0] ~ Bios: F14
                            4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
                            MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
                            Seasonic SS-660XP2 80 Plus Platinum psu (660w)
                            WD Caviar Black WD6401AALS 640GB (data)
                            Samsung 840 Pro 256GB SSD (boot)
                            SLI @ 16/4 works when running HyperSLI
                            Cooler Master 120XL Seidon push/pull AIO cpu water cooling
                            Cooler Master HAF XB computer case (RC-902XB-KKN1)
                            Asus VH242H 24" monitor [1920x1080]
                            MSI N460GTX Hawk (1GB) video card
                            Logitech Z-5500 Digital 5.1 Speakers
                            win7 x64 sp1 Home Premium
                            HT|Omega Claro plus+ sound card
                            CyberPower CP1500PFCLCD UPS
                            E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
                            Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
                            Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
                            HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
                            win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
                            .

                            Comment


                            • #15
                              re: Random Haswell BSOD Problems

                              My bet for the BSOD culprit is a newer crapola Nvidia driver, or a recent update of the Adobe Flash player used by browsers. Newer Nvidia driver means anything from mid 2013 forward. My personal two most prolific BSOD generators.

                              A few observations regarding Haswell to remove doubt for the OP.

                              The Haswell PSU compatibility thing is very rarely a problem. The basis is a Haswell processor going into such a low power state at idle, the 12V PSU rail will not see/have the minimum load it requires, and become unstable, usually voltage fluctuations. This occurs on older or cheap PSUs

                              If your PSU is a single 12V rail design, and you have at least one 12V fan in your PC case, no issue. How many PC builders will have systems where the ONLY 12V rail load is the CPU voltage regulators? That's right, next to none. Use a HDD or Optical drive, you're fine... wait, they could power down when not used, but a zero load, I doubt that. Use a video card, HA! What Haswell PSU issue?

                              If you have a truly multi-12V rail PSU, then a little load balancing is in order. If your PSU derives its 5V and/or 3.3V rail from the 12V rail (like a Seasonic Gold or Platinum) then you can ignore this too.

                              Having C7 enabled by default in an Intel 8 series chipset board is not a given. C-States are usually set to Auto, which is not really enabled. You may be required to choose C7 as the lowest C-State. Set C7 (and the other of course) to enabled and monitor your CPU power usage, nothing in a desktop PC approaches it.

                              Windows Sleep does not put a processor into a C7 state, the CPU is dead off.

                              Comment

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