Is my Radeon 9800 failing?

Hi!
I've got a 2003 model 1.8GHz Powermac G5 (single processor) with an ATI Radeon 9800 video card - this card was a build-to-order option at the time I purchased the system.
A couple of day ago I started to experience strange artefacts/corruption appearing on my screen. Rather alarmingly, the artefacts show up in screen captures I make (can post screen shots if anyone thinks it would help...).
I've taken the following steps to try to identify the problem:
1. Rebooted (obviously!).
2. Reseated the video card in it's AGP slot (I'm comfortable working inside computers so I'm pretty sure I didn't break anything whilst doing this...).
3. Reset the PRAM on the G5.
4. Booted from a Firewire drive into TIger (I'm running Leopard on the G5's internal HDD) to rule out any OS issues.
5. Tried a different monitor and a different display cable.
6. Changed screen resolution, refresh rate and colour depth in system preferences.
The problem persists after trying each of these steps. I have noticed that screen behaves OK when the computer is first switched on or after it's been woken from sleep - it takes a few minutes for the corruption to kick in - perhaps suggesting that the fault only develops when the card has had time to heat up? With the machine powered up, the cooling fan on the Radeon card seems to be spinning away as per normal.
I haven't installed any new hardware or software recently.
I can really only conclude that my video card is dying - unfortunately I don't have access to a spare card to check this out. My next step is to order a replacement card from Apple (grits teeth at cost...), but I wonder if anyone here has experienced any similar problems, or if I'm missing something obvious....
Thanks in advance for any help!
Matt

Here's an update on the situation: With some work booked in for early next week, I needed to get the system back up and running again ASAP.
I ordered and received a Radeon X800 XT card from Apple. It worked perfectly for about an hour and then the problem came back - even worse than before. I was now worried that the fault might have been on the logic board all along...
...However, some research on ATI/AMD's website, and also some further digging on these boards suggested that there is a known and unresolved problem with the latest batch of X800 XT cards. A call to ATI's support desk with my serial number confirmed the card I'd received new that morning was one of the effected batch (so why, you might ask, have they not be recalled and are still being sold?).
I got back in touch with Apple and was offered either a replacement or a refund (the support staff were very helpful). Since they couldn't guarantee that a replacement card wouldn't be from the same batch and therefore have the same problem, I requested a refund and ordered my only other option: A Radeon 9600 256MB.
It does kind of sting having to pay so much for such a vintage GPU and essentially a downgrade to my original card, but on the upside, the new card arrived this morning and my system has been running flawlessly for the past several hours (keeps fingers crossed it stays that way!), plus I've gained a dual link DVI port.
I do, however, want to have a go at resurrecting my 9800 card - so thanks to Tom for the link to the Arctic Cooling solution he provided above. I think it's going to sooner rather than later before you can't get new AGP cards for macs, so it would be good to know I have a spare on hand...
Matt

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    I don't wish to sound redundant here, but I've been reviewing the vendor's page:
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    I tried all the drivers (the new and the old drivers).  Even if all are updated, it freeze.
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    What Bas said about 30+ amps on the 12v rail does have merit. Even if you don't use it now there may come a time when you want to upgrade the system and certainly you won't want to buy yet another PSU then. A High end vid card now takes almost as much as the CPU to operate. Now days the 12v rail is the most important. Past systems regulated everything off the 5v railk and 12v was used mostly for powering drive motors. Now though the MB's use the 12v line to regulate all the voltages for the CPU, Chipset and other features as does the Vid cards. 3.3 volt lines are used for memory so we hardly use any 5v nowdays.
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    If the computer shop gives you a bunch of bull about power needs havbe them stop by the forum and we can help set them straight on this. There is more than enough data from MSI and historical data here that suggests that 16a on the 12v rail is certainly not enough. Hey I am not trying to sell you anything. I am just trying to help you get it right. The computer shop is the one trying to sell you something we just feel they are selling the wrong junk.

  • Does 10.5.6 Support Dual displays for Radeon 9800 Pro Mac Edition cards?

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    Hi there,
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    Hi-
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