Help! 3D graphics problem - ATI Radeon 9800xt graphics card

Hi it's my first post here. Really need some expert advice from this forum.

Bought this graphics card on Ebay. The seller claimed card works with my motherboard and Windows Vista - that I can display the Aero glass graphics etc.

The drivers that came with the installation CD was outdated - I didn't know and it crashed my PC (black screen can't see anything) so I had to reinstall Windows. Originally I was on Windows XP but I decided to upgrade OS to Vista. Then I downloaded and installed new drivers from ATI website.

After reinstall, Vista graphics looked alright. However, my 3d graphics were bad! My Windows Experience Index scores were quite good except 3D which is only a score of 3.

Problems of 3D graphics as shown on the following pics:



As you can see, the 3D rendering has gone "weird" and I have vertical stripes on my LCD monitor which is extremely obvious when running 3D screensavers, slideshows & games. Anything to do with graphics, it's bad.

Here are my PC hardware details:

Motherboard: Gigabyte GA-8IEXP Rev 2.0 (Intel 845 chip)
Processor: Intel Pentium 4, 2.4Ghz
Graphics: ATI Radeon 9800xt 256MB AGP (manufactured by HongSun - chinese company)
Power: Antec EarthWatts 430W
Memory: 2 X 512MB (total 1GB) RAM (I'll be upgrading to 2GB soon)

My AGP slot supports 4X graphics card. This card I purchased was 8X but is backward compatible to my motherboard.

I tried to contact seller who refused to help. I also tried to contact the manufacturer but got no reply!

Can someone please help as I don't understand why I have these problems with my graphics. How do I fix this?

Thanks!

OK will try that and see how it goes. Cheers

It seems like it. Try lowering the resolution and the depth (16bit/32bit) and see if that does anything.

It does seem like the GPU has bad VRAM.

clean it out, try again