Dissapointed....

Was unlikely to be PSU, imho. Mobo, CPU or RAM, then (in that order of likeliness). My worry is your mobo is damaging the GPU(s), so if I were you, while you know the GPU is OK (perhaps re-confirm that is the case in your friends rig since it has been back in your mobo) I wouldn't be wanting to put it back in that mobo. What mobo does your friend have? If you can try your CPU and RAM in his mobo, and all is OK, you've eliminated everything but your mobo.
 
bit of topic what kind of lines were u getting? i get some sort of flickering in games on 4870 on my second build happened since i upgraded from vista to win 7.
 
How can CPU affect this anyway ?
I doubt its the ram also, ive did all tests possible and everything is fine.

He has a asus Crosshair III motherboard.

Sigh... i dont think he is even bothered with this anymore lol, but ill ask him
 
Have you tried with a different power lead? i mean the lead that connects to the psu from the mains socket.

If that doesn't change anything try rma the motherboard.
 
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You say you ran memtest, how long for? Have you tried running memtest while also stressing the gpu and cpu?

If your cpu and gpu are idling then your case isnt getting that hot, maybe the memory is only failing when temperatures are high?

You say you removed one stick and tried that, did you try putting that back in and removing the other?
 
Dunno if this has been suggested or not, but if you dont get much luck, have you considered just returning the likely culprits - mobo, cpu, RAM - under distance selling regulations (assuming whatever time limit for that isn't up already). That's your legal right. Then just buy again! RMA process doesn't seem to be working for you!
 
Ive got another problrm..

So i turned my PC on the side and tried to take 1 stick of ram out etc etc to see if it would fix another problem.

instead of turning the PC straight up i did it upside down and the PSU came off. i turned it back to straight and turned on the computer, no display. now the PSU is making a buzzing noice when moved or something.

Did the PSU die and kill something else with it ? :/
 
Alright, Ive ruled out the following:

Monitor
Power Supply
Graphics Card
RAM
CPU

Which leads to one more thing - Mobo, which is what everyone said I should RMA.

BUT - I was reading up on this people haivng similar problems and I could never find anyone write anything about a motherboard, so its kinda strange.

Ive used different cables for monitor etc and different GPU adapter, also diff PC.

Well anyhow.. idk when ill send it, maybe ill just buy a new one straight away
 
your still having problems?!
thought you wouldve fixed it after nearly a month of not posting in this thread.
well good luck anyway with the RMA hope you find the problem soon.
 
I had this exact same problem with my 4870, with feint horizontal lines across the screen ONLY in games. Found out that on my VGA monitor with VGA to DVI adapter it would produce these lines no matter what but with my DVI monitor and proper DVI cable it was a perfect picture.
 
Ive tested the cad and adapter at fiends house and he didnt get anything though.

What I did was first just shove in my card inside his PC on his monitor, without lines
So we swapped monitors over, no lines
Swapped adapters on my monitor, no lines.

So ?
 
It depends if I've been unlucky, I still dont know what it is and Mobo doesnt sound likely at all. Tens of threads ove read, no one even thought about the mobo.
 
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