Ameagari

I have a question related to a possible compatibility issue. I have searched all over the internet, all the info about my GA-K8NF-9 motherboard from the gigabyte site has been taken down for some reason I don't understand and I can't check with the info I need.

About a week ago I bought an NVIDIA 9800GT graphic card and I and began to test it out.
Installed all the drivers, no problems so far.. and I started playing games. Any game, no matter the graphic requirements would crash after about 3-4 minutes of playing. All the colours would go nuts and my whole pc would freeze completely. I tried to install the newest version of drivers on the internet (not the ones on the CD I installed the first time). Afterwards, at the windows login screen I could only see a weird blue colour and couldn't select anything.. tried again and again and it worked. Same problem with the games. And afterwards it had problems recognizing my monitor. Mostly all the time, so I couldn't use it anymore.

I went to the producer and requested that they change my graphic card with another one. Now I have a brand new NVIDIA 9800GT but I'm afraid to use it. I don't know if the other one had problems BEFORE I started using it or maybe broke after I used it because of my system, mainly the compatibility of the motherboard/bios with it.

Here's some basic info about my rig:

BIOS


Motherboard


South Bridge




I don't know what else to do, I need suggestions. Thanks.