2 PC's - Exact/Similar Builds - BSOD's! Related?

Hi fellas,

I was hoping to grab some expert advice on why TWO of the PC's that I've built are having constant BSOD's. Okay so a little background first...

Computer 1 was built this year, 2011, in January. Now this PC has been running smoothly until I decided to reformat it and clear out on the clunk and junk on it. This was back in early September-ish I'd say. So after this, The BSOD's started popping up! Now I have not upgraded any hardware since building in back in Jan 11'.

Here are the important specs for Computer 1.
MOBO: Gigabyte UD3
RAM: 4GB -can't remember the brand
CPU: i5-2500k 3.3Ghz
GPU: Gigabyte HD6950
HDD: WD Black 500Gb
PSU: Antec TruePower 750W
OS: Windows 7 Pro x64

Now onto Computer 2!
So a relative of mine decided to uprade his family PC which was closing in on its 10th birthday. Heard that I'd built a PC and decided to put that family bond that we share to good use :). So he decided he wanted the exact same build as Computer 1 but with slight changes. Here are the specs below. **Indicates changes to the first build.

MOBO: Gigabyte UD4**
RAM: 8GB -can't remember the brand**
CPU: i5-2500k 3.3Ghz
GPU: Gigabyte HD6950
HDD: WD Black 2TB**
PSU: Antec TruePower 750W
OS: Windows 7 Pro x64

Now no more than 1 week after I'd delivered his brand new spankin' PC to him, he came back to me reporting that his PC had been getting BSOD's. Now to be honest, I did sort of see it coming as Computer 1 had already been facing these issues. Upon delivery of Computer 2, I told him to report to me if BSOD'd at any time. I thought that Computer 1 was BSODing of another matter.

Now having 2 PC's that are facing the same issues, I am forced to conclude that these BSOD's might be related. Now I know that both PC's might have their seperate issues causing the BSOD's, but I am convinced somehow the two BSOD's are arising from the same issue.

I have attached the information files for both PC's but for some reason, I was not able to run the perfmon report on Computer 2. It would just give a timeout error during the 'generating report' stage.

Looking forward to any advice that is provided to me!

Cheers.