incompatibility??

[kanshos]

i am running windows xp on an ECS K8M800-M2 motherboard, 512mb of ram and two hard drives, one 80gb and one 40gb. I recently bought ans asus n6200 128mbddr agp8x graphics card. I tried installing the card in my PC. I installed the drivers and directX and my card was working fine. However, when i run a game, after five or so minutes of playing, it will either quit the game and give me an error message(Prince of Persia), or freeze the video but still play the game sounds(Tomb Raider 3). After that, i cant run any games and if i run "dxdiag", AGP Texture Acceleration is greyed out and Direct£D Acceleration fails, giving me a "failed to create device" error message.
Is my graphics card incompatible with my board or possibly has it got something to do with ram?, what about updating the BIOS?
Please, please, please, please, please help

 

[micker377]

Could be overheating of the video board, or too weak of a power supply. Does this board require a separate molex plug, and if so does your power supply have the plug for it?

 

[kanshos]

Im not very experienced with computer hardware so i dont know what a molex plug is. This is my motherboard.

http://www.ecs.com.tw/ECSWeb/Products/ProductsDetail.aspx?DetailID=555&MenuID=0&LanID=8

I have an ATX-400 power supply so i dont think power supply is the problem.
What about the ram issue, could that be the problem?
Im using 2 HANON 256 mb PC400 DDR sticks
Iv been led to believe that the ram and PC clock have to be running at the same speed for you system to run efficiently. I went into the settings and
in the Advanced Chipset Features, under DRAM Clock/Drive Control:

Timing Mode = [Manual]
Memclock Index value = [100MHz] (with option to go up to 250MHz)
CAS# latency Tcl = [3]
the User COnfig Mode = [Auto] &
MTRR = [continuous]

HOWEVER

under Frequency/Voltage Control:

DIMM Voltage Adjust = [2.60V] (range 2.55 - 2.70)
Auto Detect PCI Clock = [Enabled]
Spread Spectrum = [Enabled] &
CPU Clock = [200MHz]

Sorry to be unflinchingly detailed but i'm not sure what info is important and whats not. But anyway, isnt my Memclock Index value supposed to be the same as the CPU Clock speed. If so, what should I set these values to? Will this solve the graphics issue. What about updating the BIOS?

PLEASE HELP!!! I HAVE SCOURED THE NET FOR ANSWERS BUT I CANT FIND ANY DETAILED AND DEFINITE INFORMATION REGARDING THIS. I WOULD GREATLY APPRECIATE EVEN THE SLIGHTEST HELP.

Kanshos