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Problematic 2x512 XMS Corsair PC4400C25PT


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First I would like to say hello to all.


Excuse me if my english is not perfect but it is not my native language. I have 2 sticks of Corsair PC4400C25PT.They are not matched pairs (Twinx) but they were bought at the same time from the same store from same shipment. I live in Bulgaria (Easter Europe) and here there are not TwinX kits available with this Memory - so 2 sticks were bought with the idea to work in dual channel. I have done so before with Corsair Value/XMS memory for a long time and have never experienced the problems I have now. First when I installed them I had Intel Platform (P4 2400 Northwood + ASUS P4P800-X) and I did whole night 12 hours prime95 at 200FSB DDR400. I had problems booting in OS with 2.5-4-4-8 so I changed it to 3-4-4-8 and had no errors for 12 hours in prime95 as I stated above. The motherboard is quite the budget one so I switched to NF4 SLI recently with Epox 9NPAJ SLI and Athlon64 3000+ as this memory is stated to work on this chipset on Corsair's website. I got the memory working at 2.5-4-4-8 set to manual and all other settings set to AUTO. I let Memtest86+ 1.65 loop 2 times at DDR400 and at DDR550 with no errors at those timings. But when I boot in OS I test for stability with Prime95/Orthos and get errors in munites. I will give a screenshot in this thread too. In the screenshot the processor is at Default Speed in order to limit the problem to memory. The memory is also set to DDR400 (FSB 200 1:1) 2.5-4-4-8 set from BIOS and It gives error in under a minute. I have set Vdimm to 2.8 from bios since 2.75 is not available (so it is written in corsair's website about 9NPAJ/+ SLI - both MB use same bios). My question is the RAM gone bad ( I searched the forum and found numerous threads about problems with same PC4400C25) or do I need to make another setting in BIOS? One more thing is that the reseller of Corsair Memory removed this kind of ram from their pricelist which for me is quite weird.


If anyone here can help out please feel free to reply :)


P.S. I can write all my BIOS settings on Ram if that will help. The only ones that are manual are :

CAS# 2.5

RAS# To CAS# Delay 4

RAS# Precharge 4

Cycle Time 8


Edit1 : I have taken out the dimms and I will write all the numbers written on them. They have Corsair's Logo and Holographic stickers.

CMX512-4400C25PT XMS4404v1.1 0522197-0

XMS4400 512MB 550MHz 2.5-4-4-8

This is written on both packages.

Serial Numbers on stickers are probbaly from reseller :

512D55011080501 and 512D55011080507

sticker on the back same for both : 34201005

Info on papersheet :



then there is barcode and this number :

8 70584 00434 9


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If you are not over clocking I would set the memory voltage to 2.75 Volts and then set the timings to Cas 2-3-2-6 with the Ras to Cas set to "3" and then test the modules one at a time with http://www.memtest.org to be sure


OK. I did as you said. I set Vdimm to 2.8v since there is only 2.7/2.8v and in corsair's website there are tests on Epox 9NPAJ/+ SLI with this setting. I used manual timings 2-3-2-6 with Command rate set to AUTO(2T). I did 2 loops of memtest86+ on each module with no errors. Then i booted into OS and started prime with CPU at stock speed - this removes it as being the failure. Then I tested each of the two modules in single channel at these timings. One failed quite fast in both Orthos and Prime95. But the second didn't so I left it to test today all day long while I was at work. I came back just now and it had given error on 5th hour. Below are the screenshots. So what do I do now :(




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