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Corsair XMS PC4400C25 issues


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Hi all!


i dunno if i did wrong last time, but instead of posting a topic about it in this forum, i mailed my problem to "'ramguy@corsairmemory.com'" 16 september...


since i still havent gotten a response, i thought i might as well try to post it in here too...


this is the mail ive send 1,5 months ago:


Dear Corsair,


I’m having a very difficult problem.


About a half year ago I bought your Corsair TWINX PC4400C25 DDR-RAM modules and a DFI NF4 Ultra-D. In the beginning all went very well. It was 100% stable at stock settings and I didn’t have any problems with the RAM while over clocking. I had a AMD Winchester 3200+ CPU with normal stock air-cooling, so the barrier with over clocking that I encountered was my CPU, not the RAM. I actually was really happy about the RAM.


In meanwhile I was a frequent visitor of http://www.dfi-street.com

I read A LOT of threads there about issues with all kinds of Corsair RAM and the DFI NF4 series, so I was very happy my Corsair RAM didn’t have any issues and didn’t fail any memtest or prime sessions unless I went beyond the CPU’s capabilities.


But after a few months I started getting stability problems. My system wasn’t stable anymore at settings that were 100% rock stable before.

Since my Winchester CPU wasn’t really that good, I thought that my CPU was the problem, and since I was already planning to replace it with a Venice CPU, I just let it be for a short while.


But when I got my Venice CPU, I decided to first install the newest BIOS on my DFI mobo. Since installing a new BIOS on an unstable system isn’t really smart, I first put all BIOS settings back to defaults (the same defaults that once were rock stable!)

Prime failed within 30 seconds after setting everything back to stock speed.


So I got really worried and started looking for the issue (the DFI mobo has A LOT of settings that can have an influence on stability)


I looked for multiple days without any success, I couldn’t get my system stable anymore.

In the end I just updated the BIOS with a system that was the most stable I could get it, but still unstable…


So I replaced my Winchester CPU with my Venice CPU, and hoped all problems would be over now

But they weren’t, I had EXACTLY the same problem with my brand new Venice 3200+ CPU.


So I started looking again and even further.

The very last thing I tried was something, I guess, NO ONE would ever think that it could be the cause… BUT IT WAS…


THE setting that made the difference in stable and unstable was…. The FSB… and now comes the really weird part…


My system was only stable with an over clocked FSB, and it was unstable with a stock FSB of 200Mhz.

After lots of trying I find out that it became stable when I increased the FSB above 209-210Mhz, and everything below was unstable…

Also not every FSB above 210Mhz was stable, but most were


I am quite sure it is the FSB ALONE that cause stability or not, below I will convince you of the same thing with an example:


With all BIOS settings at stock and multiplier reduced to for example 8, the system would run at 1600Mhz instead of 2000Mhz, which normally should be really easy…

But prime fails within 30 secs…


When I increase ONLY the FSB to 220Mhz the system becomes rock stable

Also with settings like 9x285Mhz the system became rock stable


To be even more sure then I already was, I switched back the Winchester CPU instead of the Venice CPU to see if the Winchester still had the exact same problem. And it did have the EXACT same symptoms (the only difference is that the Winchester needed about 211Mhz FSB instead of 209-210Mhz to become stable)


So I was certain that it wasn’t the CPU… The next thing I was thinking about was that my mobo became broke… So I contacted DFI for help… I explained them the situation, and they thought it could be a broken chipset, and told me to RMA it if necessary through the shop I bought the mobo at.

So I contacted the shop were I bought my mobo, I explained the situation, and they explained my that they wouldn’t mind RMA’ing the mobo, but they advised my to first test it with other RAM.


They told they have had looooots of issues with Corsair RAM and DFI NF4 mobo’s and that they wouldn’t be surprised if this was the real issue.


I told them I didn’t really believe that since I never had memtest problems and I really liked the flexability of the RAM till now… But off course I wouldn’t mind trying this if they provided me with other RAM.


So one day I took my system to that shop, in the hope to RMA the mobo so the problem would be solved.

But when we tested the system with other RAM (OCZ) we noticed that all stability issues disappeared, and that it would be rock stable once more, even at stock speeds…


This really surprised me… The RAM I always thought of being very compatible with my system, despite of all other users having problems with it, did seem to cause instability…

The owners of the shop told me they weren’t surprised at all. They explained me that despite all effort that DFI did to get the corsair RAM compatible, and despite that this type of RAM contains TCCD chips, like many other manufactures use, Corsair seemed to do something different with their RAM causing all kinds of weird problems.


So now I knew… It was my Corsair RAM causing the problems… luckily for me the system was only unstable at stock settings, so it wasn’t really an urgent matter, so I just went back home and reinstalled my system.


Unfortunately this isn’t the end. Cause when I got back the system seemed stable (over clocked that is) at first sight (memtest, prime, occt don’t have any problems)

But now im having random blue screens


They don’t occur while stressing the system at all, so I don’t think its an over clocking issue


They occur very random, sometimes while doing nothing, sometimes while doing something…


I am afraid also this is the memory, I just don’t know what to do with it…


I’m pretty sure that the memory isn’t defective, and that it would work when putting it in another brand of mobo…


I’m sure you guys aren’t new to these compability issues with DFI NF4 mobo’s, so I was hoping if you guys might be able to tell me whats next…


Cause I am becoming quite clueless in meanwhile


I bought this memory for A LOT of money (260 euro) and in meanwhile its only worth 190 euro, so if I wane sell it I would prolly only get 150 euro for it (perhaps)

So that wouldn’t be really interesting


I also don’t think RMA’ing could be a solution, since it’s a compability issue, and not a defect….


I really hope you know a solution for my increasingly difficult problem.


Thanks in advance,




well, 1,5 months later, im still having the random bluescreens


and im really getting tired of them too


plzzz help me out here peepz

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Dude im experiencing exactly the same thing that happened to you. Worked fine for a few months, then all of a sudden i start getting random reboots and blue screens. Its gotten worse now. Im using the same mem as you. I also have the DFI NF4 SLI DR mobo which started having the problems on. Went out and bought the ASUS premium thinking it was a motherboard issue, but it was doing the same on that board. Although with my ram, im getting errors in memtest on both sticks. Each tested on there on. I myself am waiting for a response from CORSAIR. Have to wait and see how long:[pouts:
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  • Corsair Employees

Moving this thread to Compatibility Section!


Please make sure you have the latest -3 BIOS installed for your MB (download the Beta version) and load optimized defaults settings, and try the following BIOS settings;


TwinX512 or Twinx1024-3200Xl

Genie BIOS/DRAM Configuration

DRAM Frequency Set: 2:1 or 400MHz or 200 (if option are 133/166/200)

Command per Clock: Enabled

SDRAM CAS Latency: 2T

SDRAM RAS to CAS Delay (tRCD): 2T

SDRAM Row Precharge (tRP): 2T

SDRAM Active to Precharge Delay (tRAS): 5T

And leave the rest at AUTO setting

Genie BIOS

FSB BUS Frequency: 200

LDT/FSB Frequency ratio: 5X

LDT Bus Transfer Width: 16 16

CPU/FSB Frequency ratio: Auto

PCI Ex: 100

K8 cool N’ quiet: Disable

CPU VID Start Up Value: 1.55

CPU VID Control: 1.55

CPU VID Special Control: Auto

Chipset Voltage Control: 1.6

DRAM Voltage Control: 2.8

All other settings are motherboards defaults

Then please test them one at a time with http://www.memtest.org and let’s make sure it's not some other issue! I would run the test for at least 2-3 passes to be sure!

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atm the moment im using the latest stable bios (623-3), and u are suggesting me to use a beta bios?


im very skeptical about using a beta bios for a mobo


if that beta bios (704) was so good and stable, they would have brought a stable version of it looooooooooong time ago according to me (cause its very old allready)


are u sure that this 704-3 bios is better, AND, especially, STABLE?

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man i'm happy i found this post i'm running pc440025cl on my asus right now but just orderd a dfi ultra d and was wondering if the combo would work my oc right now is 2834*12 and very stable but wanted to get higher. my only worry was will this corsair run in the dfi adn get me higher oc's. if it increased any of your oc's how and by how much.
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