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Weird Problem with Radeon 8500 card and Dual G4
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Fresh-Faced Recruit
Join Date: Sep 2004
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I purchased a Radeon 8500 card off eBay to replace my first generation Radeon card in my Gigabit Ethernet, Dual G4 450. The problem is that at random intervals (sometimes right after boot, sometimes after an hour or so) the screen will become distorted with weird green graphics. The only solution is to restart the system.
I thought at first it might be receiving interference from the SCSI 160 card, but after moving it and my T.V. Tuner card to the lower slots (This leaves a one PCI card space between the 8500 in the AGP slot and the other PCI cards), The problem persists.
I'm hoping that someone here has had a similar problem and hopefully found a solution.
TIA.
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Moderator  Join Date: Sep 2001
Location: Arizona
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Is the card a Mac version or a flashed PC card?
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Fresh-Faced Recruit
Join Date: Sep 2004
Status:
Offline
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Moderator Join Date: Sep 2001
Location: Arizona
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It should have said in the auction description.
Another dead give away is if the fan on the card says 'Powered By ATI', which would mean it is a PC card that was flashed.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Fresh-Faced Recruit
Join Date: Sep 2004
Status:
Offline
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The fan does not say "Powered by ATI", it does have the ATI logo on it. With a 12 digit number written above it (starting with PN) and a larger 4 digit number written below it.
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Administrator  Join Date: May 2000
Location: California
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Can you link up a picture of your card? It's likely a flashed card with cheap VRAM that's clocked too high. It's very possible that it could be fixed by downclocking the VRAM.
Launch a DVD movie and look for green or white specks that appear randomly on the picture, that is another giveaway about cheap VRAM on a flashed PC 8500.
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Fresh-Faced Recruit
Join Date: Sep 2004
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A thousand Thank You's. While I still do not know to a certainty that the card was originally build for a PC, decreasing the speed of the memory by 10% has SEEMED (It has been several hours, which if memory serves is the longest its ever operated correctly) to fix the problem (knock on wood).
Again, thank you for your assistance.
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Moderator Join Date: Sep 2001
Location: Arizona
Status:
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Yeah, it is most likely a PC Radeon 8500 LE.
Most 8500 LEs, especially the more generic of the breed, shipped with low-quality RAM that didn't handle high clock speeds. The standard Radeon 8500, built by ATI, shipped with 275MHz memory if I remember correctly. Many generic 8500 LEs shipped at speeds as low as ~200MHz.
The Mac version of the Radeon 8500, although 100% completely and totally identical to the PC version of the card, shipped with the memory clocked down to 250MHz.
Whoever flashed that card of yours, if it was flashed, probably flashed it with the 250MHz Mac ROM, higher than it's LE memory was capable of handling.
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I like chicken
I like liver
Meow Mix, Meow Mix
Please de-liv-er
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Fresh-Faced Recruit
Join Date: Sep 2004
Status:
Offline
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A thousand Thank You's. While I still do not know to a certainty that the card was originally build for a PC, decreasing the speed of the memory by 10% has SEEMED (It has been several hours, which if memory serves is the longest its ever operated correctly) to fix the problem (knock on wood).
Again, thank you for your assistance.
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