artifacting and instability - possible causes?

[xxTurbonium]

Basically: was having artifacting/crashing issues with my 6800GT (stock clocks, never overclocked), so I figured it was dead.

I moved it over to another computer to make sure. I'm stability testing it now and there is NO artifacting or issues whatsoever.

Is it possible that a bad rail (4-pin molex) on my computer is the cause of the issues?

Here are my rails: http://img.photobucket.com/alb...493/photohub/rails.jpg

And some screens (often worse than what is even shown here, like massive polygon dancing and such):

http://img.photobucket.com/alb...ohub/artifacting-1.jpg
http://img.photobucket.com/alb...ohub/artifacting-2.jpg

Could it even be the VGA port maybe? The computer I'm testing it on right now uses a DVI monitor, while the original "trouble" computer uses VGA monitor.

I'm really kind of confused here...

I've also considered temps, but the average GPU temp range in full load in my computer would be around 65-75C (well within spec).

The computer it is running in now with no issues... the temp was 67C last time I checked.

The card itself is kept relatively clean and dust-free (I cleaned it with compressed air once every few months). The fan runs fine (I even tried running it at 100%). I doubt it's a heat issue at all...

Please help?

 

[tigersty1e]

The only thing I could think of is putting a different video card in the computer that is causing problems.

 

[xxTurbonium]

I did... it works fine, but the problem is it doesn't require an extra power connector like the 6800GT (it's a 9600 Pro).