Graphics problems

[civ_bruce]

Hi I am getting some weird graphics problems in Civ 4 (see attached screenshots).
My relevant specs are as follows
CPU: AMD 64 3700
RAM: 1GB
GPU: 7900 GT (driver 91.47)
MOBO: Asus A8N-SLI premium

I am running patch 1.61. I have also tried lots of drivers.
The problem does not occur straight away. It happens after a seemingly random period and then keeps happening after that.
If I scroll to a new part of the map and come back the problem is still there. But when I alt-TAB and come back in the problem has cleared.
I realise that the 7900 GT's have had problems but I seem to be able to run all the other potential problem causers (eg 3dMark2006 - Deep Freeze) without any trouble.

Just wondering if anyone has any suggestions or if anyone else has had this problem.

 

[crunch]

try different graphics details level.
try fullscreen vs windowed mode.
try the magic ini file option: SetMaxFrameRate=30.
check for overheating.
underclock your GPU.
...

 

[Mulholland]

Watch out for that card. I have the same card (eVGA geforce gt ko) and had a few similar problems. A reboot would take care of it at first but the problems became worse and worse. Turns out there's a bad batch with memory problems. After troubleshooting to no avail I called the eVGA people and they informed me indeed I have a bad card. I now have an RMA in the works. Call them decribe your graphics problems and most likley get anew working card.