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Thread: 2 Modules better than 4?




  1. #1
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    Default 2 Modules better than 4?

    Hi there.

    I recently RMA'd 4 gigs of RAM - TWIN2X4096-8500C5DF (4gb Dominator) back to Corsair and I decided to get some TWIN2X2048-8500C5D (2gb Dominator) to use in the meantime.

    Now I have the RAM back from Corsair I'd like to use all 4 modules, so I can use 6gigs of RAM. I tried it and I'm getting random crashes all the time.

    So, any suggestions to get all modules playing nicely together?

    Heres some info which can help:
    I'm using Gigabyte P35C-DS3R motherboard. BIOS is F12g.
    RAM is fine individually (8hrs MemTest+)
    The RAM is supposed to be able to run at 1066Mhz and at 5-5-5-15 timings - tested in MemTest+ also.

    I'd rather buy a new/better/different motherboard which can handle 4 modules at this speed and settings than run with only 4gigs of ram.

    Any help would be fantastic

  2. #2
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    Default Re: 2 Modules better than 4?

    http://asia.giga-byte.com/FileList/M...35c-ds3r_e.pdf
    http://www.corsair.com/_datasheets/T...6-8500C5DF.pdf
    http://www.corsair.com/_datasheets/T...48-8500C5D.pdf

    You may need to increase DDR2/DDR3 OverVoltage Control a little for stability. Go into your bios and navigate to PC health Status and find out what your ddr2/ddr3 voltage is reading. If it is below 2.1v which is the Corsair 's recommended voltage for TWIN2X4096-8500C5DF and TWIN2X2048-8500C5D. You will want to manually increase it to the recommended manufacturers specifications. You will need to navigate to MB Intelligent Tweaker(M.I.T.) You will find it in the motherboard manual around page 50
    System Voltage Control
    Determines whether to manually set the system voltages. Auto lets BIOS automatically set the
    system voltages as required. Manual allows all voltage control items below to be configurable.
    (Default: Manual)
    Adjust DDR2/DDR3 as needed.
    DDR2/DDR3 OverVoltage Control
    Allows you to set memory voltage.
    Normal Supplies the memory voltage as required. (Default) "speculation here" because you did'nt post your pc health status Im thinking this is normally about 1.8 @1.9v
    +0.1V ~ +0.7V Increases memory voltage by 0.1V to 0.7V at 0.1V increment. "again speculation here" because you did'nt post your pc health status, but I am thinking you should set it to +0.3
    Last edited by artdrivers; 08-07-2009 at 01:08 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
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  3. #3
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    Default Re: 2 Modules better than 4?

    Hi, yes I forgot to mention I previously used +3 on the DDR2/DDR3 setting. According to EZtune6 it should have been 2.1v

    I decided to check the PC Health Status thing though, and I found something quite strange:

    With the DDR2/DDR3 setting on Normal I got 1.984v in the PC Health Status reading
    With the DDR2/DDR3 setting on [+0.1v] I got 1.824v in the PC Health Status reading
    With the DDR2/DDR3 setting on [+0.2v] I got 1.904v in the PC Health Status reading
    With the DDR2/DDR3 setting on [+0.3v] I got 1.984v in the PC Health Status reading

    I'm very reluctant to go any higher than +0.3v as I've only just got things back from RMA.

    ATM, I'm using only 2 modules (4gb) and have reverted to the Normal setting on the DDR2/DDR3. Back to EZtune6, it shows I am at 2.1v which makes me even more reluctant to go higher than the [+0.3v] setting (especially since it goes red!)

    Finally, back to the 4 module thing... According to the Corsair forums, I should be lowering the memory speed to 800Mhz which seems to defeat the purpose of buying "high spec" RAM.

  4. #4
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    Default Re: 2 Modules better than 4?

    Your modules are tested at their rated speed on 2.1V. If you can't set that, then use the closest you can.

    Don't worry about the voltage setting turning red. If the sticks are rated to a voltage that the mobo manufacturer has decided should go red or flash when selected, it doesn't mean it's going to do any damage. The reason it goes red is because JEDEC standard speeds of RAM are designed to run 1.8V (DDR2-533 @ 4-4-4-12, DDR2-800 @ 5-5-5-18 etc). Your RAM doesn't conform to a JEDEC standard, as it's using a DDR-1066 speed with DDR-800-like timings. This is why higher voltage is needed, and recommended.

    The first thing Corsair themselves would recommend for RAM issues is to use the max rated voltage for the sticks. The second would be to increase MCH (northbridge voltage step by step to see if stability is reached.

    It's true that in some cases you may need to drop speed if filling all RAM slots. This has been the case for a long tiome. People have problems at times with 12GB (6x2GB) on i7 systems. The fact is that high speed RAM's pretty much worthless performance wise. Sure, you see big numbers in synthetic bandwidth tests, but real world performance gain ranges from "a little bit" to absolutely nothing.

    See the following thread and pictures of performance in far Cry 2 for how little difference there is between DDR-800 and DDR-1066, remembering some programs may gain a little more, and others less:

    http://forums.tweaktown.com/f69/newb...tml#post310404

    By the way, Newb needs help is the thread title, not an insult to anyone.
    Last edited by Psycho101; 08-07-2009 at 02:18 AM. Reason: Edited for clarity.
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  5. #5
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    Default Re: 2 Modules better than 4?

    BIOS is F12g
    After your explanation on increasing voltage it seems to me you may have a beta bios that has not worked out some of the details and you should flash your bios to F12 which is not a beta bios. This may fix the bios ddr voltage issue you are having. What revision do you have? rev.1.x, 2.0, or 2.1?
    GIGABYTE - Support&Download - Motherboard - BIOS - GA-P35C-DS3R (rev. 1.x)
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
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    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
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  6. #6
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    Default Re: 2 Modules better than 4?

    On second thought you may want to download and flash that F7 bios for a ddr voltage issue first. I don't know how much fact there is in it It has been said you should'nt jump many Bios flashes at 1 time as in F1 to F6 or F6 to F12. This has been considered to be bad. I personally only jump 1 or 2 at a time. I don't know how many times you flashed your bios before getting to your current bios but this is something you should look into. You may have skipped 1 that you needed.GIGABYTE - Support&Download - Motherboard - BIOS - GA-P35C-DS3R (rev. 1.x)
    Last edited by artdrivers; 08-07-2009 at 06:14 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  7. #7
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    Default Re: 2 Modules better than 4?

    My motherboard is revision 2.0
    The 12g bios I got was from Janus Yeh in May 2009. I'm not sure if he still posts here. I have previously had the F8 and F9 bios's. Prior to that it was the F3 bios which came with the motherboard. Would you suggest flashing the F7 first and then the F12?

    Also another query... With regards to the voltage, I have set the voltage to [+0.5v] and on the PC Health Status page the voltage says 2.038v - close to 2.1 I guess
    Meanwhile, with EZtune6 the voltage shows 2.3v which is quite scary. I'm not sure which is the correct reading.

    edit: Also used the F11 bios which gave me enough problems so as to ask for the most up to date bios from Gigabyte (the F12g one).
    Last edited by kakahara; 08-07-2009 at 09:04 AM.

  8. #8
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    Default Re: 2 Modules better than 4?

    I agree with you your bios could be giving you a false reading or your software is. We already know that the bios is miscalculating and raising it in .05 increments so it is a good reason not to trust it's results. You may want to flash F12 and see if it changed it and if it did'nt then go from there. I believe this would be the safest procedure. Another way to test DDR volts is with HWmonitor 1.14 It is here misnamed CPUID----> CPUID
    Oh yeah use the rev.2.0 F7 or F12 found here ---->
    http://www.gigabyte.us/Support/Mothe...ProductID=2631
    It looks like this and my vin 1 is ddr2 voltage ----->

    By artdrivers at 2009-06-24
    Last edited by artdrivers; 08-07-2009 at 09:16 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  9. #9
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    Default Re: 2 Modules better than 4?

    Ok, I just downloaded CPUID Hardware Monitor - its given me a proper DDR label which is 2.13v on Value/Min/Max (same on all 3)

    Since you suggested the CPUID HM, the reading on Speedfan v4.38 also says 2.13v (Vcore2 is the label there)

    Is it worth bothering with the F7 bios then?

  10. #10
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    Default Re: 2 Modules better than 4?

    Yes! I would most definitely want to get the bios reading and working correctly. If you download the F12 bios and put it on a floppy and reboot and use the end key at bootup instead of del You will go directly to your Qflash setup screen and it is a good easy way to update the bios. But you probably already know that.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


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