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TWIN2X2048-6400C3 errors


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Ok for the past week I have been trying to isolate the cause of my MEMTEST errors. Prior I had the system running stable for several months and have made zero changes to the system.


I started getting BSODs so first test was with MEMTEST which showed errors.


NOTE: system is and never was overclocked, used SLI Memory Enabled for memory timings running on an ASUS M2N32-SLI motherboard with Athlon 6000+ CPU.


So I began testing just one stick at a time to isolate which stick is bad, and low and behold individually the sticks run MEMTEST just fine. I even tested various memory slots to see if maybe a memory slot is bad.


Now I decided to reset my BIOS to default but then enable just SLI Memory (setting VDIMM volt to 2.1V also) and run the tests again. This time after 5 passes no errors. Ok great, went back to the BIOS and checked YES for Plug-n-play OS and Enabled Q-Fan. Then ran the tests again, lots of errors this time. Reset PNP and QFan and ran the tests overnight. After 18 passes I had 17 pass and 1 fail.


So any ideas of what I should do to isolate my problem? I am thinking it could be Memory, Motherboard or Power Supply. PSU is the Seasonic S12-600.



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This DRAM has been tested with either Asus M2N32-SLI Premium or Deluxe

Try these settings:

AI Over Clock Tuner: Manual

CPU External Frequency: Manually set to 200MHz

DDR2 SDRAM Clock: Manually set to 800MHz

PCI Express Freq: 100<jz

PCI Freq: 33.33

Performance Mode: User Define/Manual

DRAM Timing Selectable: Manual

SDRAM CAS Latency: 3T

SDRAM RAS to CAS Delay (tRCD): 4T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 9T

SDRAM Write Recovery Time: 5

Write to Precharge Delay: 15

Command Rate: 2T

DDR2 SDRAM Voltage: 2.4v

Advanced voltage control

CPU Vcore offset:_Disabled

DDR2 Termination: 0.5x

CPU to NB HT: 1.200V

NB to SB HT: Auto

NB Core/PCI-E: Auto

SB Core/PCI-E: Auto

SB Standby core: Auto

Chipset Core Voltage: Auto


This DRAM is pretty high end for such a setup. I'm not certain if you can run it on such a system with 2.1v. Try these manual settings and 2.4v on the DRAM.




Note the 3-4-3-9 @ 2.4V. Now you can set to the SPD manually with 5-5-5-18 and 1.9V and test as well. You can also set to 4-4-4-12 and 2.1V and test. Manually is the way to go with this very high end DRAM.



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Please note that I have the TWIN2X2048-6400C3 (no DF at the end). My memory does not have the heatsink that is on the DF version, it just has a heat speader. I was under the impression that the voltage for this memory should be 2.1V max, however I strongly suspect that if I bump the voltage up it may solve my issues.


Look what I found



and it states 2.2V, so I will give it a run tonight at 2.2V. On the FAQ page on this forum about this memory it states 2.1V.

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Ok so I tried a few things lastnight.


First I bumped the voltage to 2.2V, and I immediately getting errors in MEMTEST.


So I bumped it down to 2.150V and it took a couple of minutes before getting errors.


So down to 2.1V and it did not get any errors after a few full passes, let it run overnight and it did get a few errors during the overnight run.


I am currently letting it run at 2.050V to see how that goes, will let you know when I get home this evening.


Does this give anyone ideas as to what might be causing the issue?

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  • Corsair Employees
at 2.2 volts did you test the modules together or one at a time? If both modules have the same problems when tested individually then there may be some other issue. If one passes and the other fails, you may have a bad module.
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I did not test the modules seperately at 2.2V.


However just got home after letting the machine run MEMTEST with both modules at 2.05V. MEMTEST ran for about 12hours with ZERO errors and 23 full passes.


Is it safe to call it stable? Or should I do more testing?

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