Random crashes, heavy artifacting on screen?

As the title says I'm experiencing somewhat random crashes on my just bought system, always shown by my screen showing heavy artifacting.
Actually exactly like this; http://www.revfry.com/images/messedupcard..png

The crashes appears at random times in some games, while immidiatly upon starting other games.
The selection of games that crashes seems random, a selection of games that crash is; counter-strike source, oblivion, left 4 dead and even civilization 4.
However it runs EVE-online like a charm.

I have tried putting all graphical settings to an absolute minimum in all games, while most games could then run for 10-minutes or such they still crashes.
"Most" because left 4 dead seems to work just fine now.

What really confuses me is that EVE-online runs smoothly, it's not exactly easy on the computer.

My specs is;

Motherboard: Gigabyte P31-ES3G bundkort (PCI-E, Intel chipset, FSB1333MHz)

CPU: Intel Family - DualCore E5300 2x2,60GHz (FSB1066MHz)

Ram: Kingston HyperX 4 GB DDR2-1066 PC8500 RAM DualChannel

Harddisk: Samsung 500GB harddisk S-ATAII 3Gb/s Fluid

Graphics card: Nvidia GeForce 9800GT 1024MB PCI-E

Power: 650W ATX 17dB strømforsyning

Xp- Home

I think all drivers are at their newest release (if they aren't, I can't find anything newer)

So, got any ideas as to what causes this?

Thanks

So my card is broken? Or is it working as it should be and just a poor card?
Sorry i'm not much into computer mechanics ^^

To me it also looks like a fried video card. How long a tiem frame did the card actually work?

agree with all... that sir is a bad video card..... Remove and replace.