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Blue Screen of Death when playing games

Last response: in Windows 7
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March 3, 2011 2:58:17 PM

Hello dear fellows. It's my second problem I have that I am posting on this site, and hopefully you will help me fix it too :) . Basically, I am getting BSODs some time after I play a computer game. It happens within 10 minutes of playing Call of Duty: Black Ops, around 2 hours of Need for Speed: Hot Pursuit, and almost 12 hours of World of Warcraft. It happens all the time in those games, and I don't know why. What I am sure it's not windows issue, might be some program that I use, but definitelly not windows, because I reinstalled them twice already trying to fix this problem. Here's my PC specs:

Mainboard : MICRO-STAR INTERANTIONAL CO.,LTD MS-7376
Chipset : AMD 790FX
Processor : AMD Phenom X4 9550 @ 2200MHz
Physical Memory : 4096MB (4 x 1024 DDR2-SDRAM )
Video Card : NVIDIA GeForce 8600 GT
Hard Disk : Seagate ST3500320AS ATA Device (500GB)
CD-Rom Drive : Optiarc DVD RW AD-5200A ATA Device
Monitor Type : Samsung SyncMaster - 20 inches
Network Card : Realtek Semiconductor RTL8139/810x Fast Ethernet Adapter
Operating System : Windows 7 Ultimate Professional Media Center 6.01.7600 (32-bit)
DirectX : Version 11.00
Windows Performance Index : 5.9 on 7.9

I've also managed to take a picture of one blue screen, it might not be the best quality, but here it goes:
LINK
Also, I don't know if it's relevant, but 10 seconds before BSOD I hear a strange sound coming out of my PC, it sounds as if something is stuck and stops.

Also, sorry if I posted in the wrong section.

Thanks for your efforts in advance!

EDIT: I apparently forgot to say that I have tested my memory. I did 14 passes total, 2 passes for 2 sticks, 3 passes for one stick and 7 passes for the last one (had to go out, so just left it there). There were absolutely no errors. However, I noticed some differences between the ram sticks, so I took 3 photos for 3 different sticks:
http://img851.imageshack.us/img851/7969/dsc01393.jpg
http://img846.imageshack.us/img846/8444/dsc01394.jpg
http://img830.imageshack.us/img830/8760/dsc01395bw.jpg

Notice the different RAM frequency on one and difference "CAS" setting on another one. Might it be my problem?

EDIT2: Here are minidump file archive, 14 BSODs in total: http://www.megaupload.com/?d=SEXEWYQJ
March 5, 2011 1:44:29 PM

Bump...
a b $ Windows 7
March 5, 2011 2:22:42 PM

Your RAM should have the same timings and speed... this could be the source of your problem. While you don't necessarily need matched pairs, they are at least guaranteed to work together without causing issues. It also helps if your RAM is all the same brand with identical specs.
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March 5, 2011 4:29:48 PM

Zoron said:
Your RAM should have the same timings and speed... this could be the source of your problem. While you don't necessarily need matched pairs, they are at least guaranteed to work together without causing issues. It also helps if your RAM is all the same brand with identical specs.


So what should I do?
a b $ Windows 7
March 5, 2011 4:34:51 PM

Replace your enough of your RAM so all of the sticks have the same specs.
March 5, 2011 7:52:44 PM

Well, that sounds costy.. Wouldn't removing 2 sticks of RAM that do not match to others work to check out if it's really the problem?
a b $ Windows 7
March 5, 2011 8:44:25 PM

Certainly would be something to try, yes.
March 6, 2011 8:58:40 AM

Hmm okay I did that. Will see how that goes. However, I have noticed one more strange thing! On the RAM sticks I removed (and both on those that are on my PC), it says all are of same brand AND type, all DDR2-800. However, memtest86 still thinks 2 of them are DDR-400... Could they be broken or something? I have also included mini dump files in the original post, could anyone who can read them check them out, please?
March 7, 2011 3:27:46 PM

Bump..
March 8, 2011 9:37:50 AM

Okay, this definitely seems a memory issue, I ran memtest with all memory sticks all together, and got 2 errors in 1 pass:

Failing adress: 000aa125bf8 - 2721.1 MB and 000ae125bd8 - 2785 MB.
Good: fff7ffdf on both errors;
Bad: fff7ffff on both errors;
Err-bits: 00000020 on both.

It is possible to know which memory stick is failing? because if I test one by one, it gives no errors... Also, what does "setting: DDR2 (128 bits)" mean? When I tested them one by one, it said 64 bits on everyone of them.

Last thing. Since I identified this as a memory issue, could a mod transfer it to memory forums?
!