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Thread: Z77A-GD65 + i5 2500K Overclocking - How to start?




  1. #51
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Well, yeah, that could be an option :)

    Aaaaaanyway, well, after increasing to 1.4, I'm seeing more stability on Prime, passed the first 400K AVX FFT and now on another 128K AVX FFT test, it's been testing for 20 minutes and no BSOD, so looks like it may have been the Vcore, but of course, I'll only know in a few hours.

    I'm stressing large FFTs now, after hopefully completing, I'll move on to small FFTs and then Blend

    I guess you're right, you gotta test for stability as much as you can.

    To be honest, I didn't do any stress or stability testing when I first built the system, I tend to rely on components when they run at their stock speeds, I just don't have the energy for it :)
    CPU: i5 2500K @ 4.5GHz (45x100 1.35V) ~ BIOS 10.5
    Motherboard: MSI Z77A-GD65
    Memory: 2x4GB Corsair Vengeance DDR3-1600 9-9-9-24
    GPU: XFX Radeon 7950 Black Edition 3GB
    Soundcard: Native Instruments Audio 8 DJ
    HDD: WD 1TB Caviar Blue
    Cooling: Zalman CNPS10X Extreme
    PSU: Seasonic X-650 80+ Gold
    Case: Corsair Obsidian 650D

    OS: Windows 7 Ultimate x64
    Gamepad: Microsoft XBOX360 Wireless Controller + Wireless Gaming Receiver
    Wireless Set: Logitech Cordless Desktop LX710
    Monitor: LG 42LE5300 42" Led FHDTV [1080p @ 60Hz]

  2. #52
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Overclocking is like racing, how fast are you willing to spend....
    ....money
    ....effort
    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
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  3. #53
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Yeah yeah I know :D

    Anyway, how far would you push the Vcore on the 2500K? I know that Intel says max safe voltage is 1.52 but is it really? The Gurus as MSI said that they prefer not to cross 1.4, what do you think Jim?

    Can you also please explain how Prime95 AVX is different than the regular Prime95? Chike said that it uses double the memory, but I'm running large FFTs now and only 1.3GB is being used.
    Last edited by Zach_; 06-20-2012 at 01:43 AM.
    CPU: i5 2500K @ 4.5GHz (45x100 1.35V) ~ BIOS 10.5
    Motherboard: MSI Z77A-GD65
    Memory: 2x4GB Corsair Vengeance DDR3-1600 9-9-9-24
    GPU: XFX Radeon 7950 Black Edition 3GB
    Soundcard: Native Instruments Audio 8 DJ
    HDD: WD 1TB Caviar Blue
    Cooling: Zalman CNPS10X Extreme
    PSU: Seasonic X-650 80+ Gold
    Case: Corsair Obsidian 650D

    OS: Windows 7 Ultimate x64
    Gamepad: Microsoft XBOX360 Wireless Controller + Wireless Gaming Receiver
    Wireless Set: Logitech Cordless Desktop LX710
    Monitor: LG 42LE5300 42" Led FHDTV [1080p @ 60Hz]

  4. #54
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Your cpu won't live as long with high voltages, but what does this really mean?
    Will your cpu only last 5 years instead of 10 years?
    Are you willing to upgrade your cpu cooling to run at higher speeds.
    From my Core2Duo overclocking, I found that for a 10% speed increase, benchmarks improved 5%, half the amount, but real world performance increases often weren't really noticeable. To me, it boils down to how much better your games and programs run at higher speeds.

    In general, if Intel's max cpu voltage is 1.52 volts using air or water cooling, I'd be comfortable at that voltage, and possibly up to 10% higher.
    But I'd like to know how and why the "experts" say to keep it at 1.4 volts.
    I think that their 1.4 volt recommendation is for Ivy Bridge cpu's, and not for Sandy Bridge.
    Ivy Bridge seems to go bananas heat wise above 1.4 volts.
    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
    .


  5. #55
    Chike is offline Senior Member
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Now don't twist my words, I said double the memory access. The AVX can do x2 operations per clock and thus increases memory bandwidth, which is of course putting more stress on the "I/O".

  6. #56
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    Your cpu won't live as long with high voltages, but what does this really mean?
    Will your cpu only last 5 years instead of 10 years?
    Are you willing to upgrade your cpu cooling to run at higher speeds.
    From my Core2Duo overclocking, I found that for a 10% speed increase, benchmarks improved 5%, half the amount, but real world performance increases often weren't really noticeable. To me, it boils down to how much better your games and programs run at higher speeds.

    In general, if Intel's max cpu voltage is 1.52 volts using air or water cooling, I'd be comfortable at that voltage, and possibly up to 10% higher.
    But I'd like to know how and why the "experts" say to keep it at 1.4 volts.
    I think that their 1.4 volt recommendation is for Ivy Bridge cpu's, and not for Sandy Bridge.
    Ivy Bridge seems to go bananas heat wise above 1.4 volts.
    I don't think he was referring to Ivy since the dude runs 2 Sandys at very high clocks of over 5GHz, 2600K and 2700K, here's what he said:

    Always best to check the Intel datasheets for both the CPU series 'and' the chipset. Intel changed how they list some CPU voltages as of late. They give absolute max. VCore instead of the industry recommended max. of a 1.400v. limit. It is highly recommended to not exceed that for an everyday use type machine. On any given day, components are getting swapped out on a number of rigs. Makes life interesting. One week will run Turbo OC, the next a CPU Ratio OC, the next a raw OC with no power saving enabled. I do maintain the 1.400v. limit though (except for any extreme OC runs of course). You are on the right track. Trial and error within the specs is the best advice I could give you.
    Basically he says that 1.52 is the absolute max Vcore (Meltdown point?) and that the industry safe voltage is 1.4
    Your thoughts?

    I'm willing to plunk down another 50-70USD for a better cooling solution if need be but honestly, except for the CNPS10X Extreme being a bit noisy, I think it performs really well, keeps my temps at or below 70C at max stress, if there's a need to upgrade it, do tell :)

    Now about Prime, looks like Vcore was the issue, I've been running a large FFT test with Vcore 1.4 for exactly an hour and it seems stable, hopefully it will complete 8-10 hours of large FFTs and then I'll move to small FFTs.

    Now don't twist my words, I said double the memory access. The AVX can do x2 operations per clock and thus increases memory bandwidth, which is of course putting more stress on the "I/O".

    Oh sorry Chike, I thought you meant double usage of memory. Don't get mad :) :) :)
    CPU: i5 2500K @ 4.5GHz (45x100 1.35V) ~ BIOS 10.5
    Motherboard: MSI Z77A-GD65
    Memory: 2x4GB Corsair Vengeance DDR3-1600 9-9-9-24
    GPU: XFX Radeon 7950 Black Edition 3GB
    Soundcard: Native Instruments Audio 8 DJ
    HDD: WD 1TB Caviar Blue
    Cooling: Zalman CNPS10X Extreme
    PSU: Seasonic X-650 80+ Gold
    Case: Corsair Obsidian 650D

    OS: Windows 7 Ultimate x64
    Gamepad: Microsoft XBOX360 Wireless Controller + Wireless Gaming Receiver
    Wireless Set: Logitech Cordless Desktop LX710
    Monitor: LG 42LE5300 42" Led FHDTV [1080p @ 60Hz]

  7. #57
    Chike is offline Senior Member
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    I don't know who gives this guy his information, but in Intel SB datasheet the VID range for the CPU is 0.something to 1.52v max (never said absolute).
    Both I/O and SA voltages exceed their "max" by overclockers, question is how lucky do you feel.

  8. #58
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    A web search using: i5-2500k maximum voltage provides quite a few differing opinions.
    With decent cooling, up to 1.42 volts is probably safe for gaming or when maximum performance is needed.
    I suggest going with two different stable bios profiles, one for 24/7 "normal" operation and one for gaming.

    If I had your setup, I would measure cpu voltages with a DMM with different LLC settings.
    Maybe the MSI LLC setup isn't that great.
    In Sin's z77/IB review with a Gigabyte board, I think he recommended the Turbo LLC setting, and not to use the Extreme LLC setting.

    With older LGA775 setups, enabling LLC would let you run with slightly lower cpu voltages.
    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
    .


  9. #59
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    yeah I read that too but I thought 1.52 is the absolute voltage, I've also read a review in which I remember the reviewer writing that 1.4 is nothing for Sandy Bridge CPUs but it's a lot for Ivys...

    Well, in that case, 4.8 might be an option :)

    So far my large FFT test is running for 2 hours and looking good.

    More updates to follow.
    CPU: i5 2500K @ 4.5GHz (45x100 1.35V) ~ BIOS 10.5
    Motherboard: MSI Z77A-GD65
    Memory: 2x4GB Corsair Vengeance DDR3-1600 9-9-9-24
    GPU: XFX Radeon 7950 Black Edition 3GB
    Soundcard: Native Instruments Audio 8 DJ
    HDD: WD 1TB Caviar Blue
    Cooling: Zalman CNPS10X Extreme
    PSU: Seasonic X-650 80+ Gold
    Case: Corsair Obsidian 650D

    OS: Windows 7 Ultimate x64
    Gamepad: Microsoft XBOX360 Wireless Controller + Wireless Gaming Receiver
    Wireless Set: Logitech Cordless Desktop LX710
    Monitor: LG 42LE5300 42" Led FHDTV [1080p @ 60Hz]

  10. #60
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    Default Re: Z77A-GD65 + i5 2500K Overclocking - How to start?

    More updates to follow.
    Thanks for the warning

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