On Mar 23, 2010, at 7:45 PM, John Carmonne wrote:
I just ran AHT and the VRAM failed. Can that be fixed or is it worth fixing?
Sometimes the card can have the wrong firmware for the speed of the chips if it's a flashed PC card, or perhaps is just running to hot. Either way, the result is similar to what you describe, the card starts off OK and then gets more and more video glitches as it warms up. If it's running too hot, a better heatsink or fan will fix it. If the firmware is causing it to run too fast for the chips, the solution is to underclock the card to match the speed to the VRAM chips soldered on the card. This is normally fairly simple. I believe you can even do it using a Preferences Pane called "ATIccelerator II"? If you want to experiment, there is near zero danger when underclocking a card to a slower speed. The only real danger is in overclocking to a higher speed. The OEM Radeon 7500 has 270MHz GPU and 200MHz VRAM. You could try slowing the VRAM and/or GPU to see if that eliminates the problems.
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