GF6600 harware problem?

[zibalunas]

I've been having problems with my GF6600(AGP) for quite some time now. It all started back in windows xp . For example when i played games, textures started to flicker in all colors of the rainbow(looks like overheating). Later i got another issue, starting any Direct3D application (i think) would crash windows (for example when i paly movie with media player). Eventualy after one of these crashes windows didn't recover So i tried reinstalling windows, immediately after reinstall i ran media player and windows crashed again and failed to start (so i thought this was a sign from God to use linux fulltime). Now on Linux if, i enalbe AGP, X freezes and i get Xid errors(with both 71x and 81x drivers). So i gues my hardware is responsible for this. Now for the question, how to pinpoint the cause of the problem? Is there any way to test my GF6600 & Motherboardfor hardware errors? (maybe there is some kind of program for this, me memtest or smth.) Maybe someone who had similar experience could help me.

here's my hardware:
AMD Sempron 3100+
Epox 8HEAI (VIA K8T890CD + VT8237R AGPset)
GeForce 6600

Edit:
I just noticed interesting thing, both my video card and motherboard SHOULD support AGP 8X but:

[agent_jdh]

This sounds very similar to when my old FX5900XT started dying with bad memory chips. It needed replacing - ironically with a 6600GT (under warranty, it was only 9 months old).

You _could_ try underclocking the card's memory, but short of swapping in another card to check your setup it's hard to say 100% that it's a faulty card.
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