The 128 DDR ATI Radeon 9800 agp card in my Dell Dimension 8300 was replaced several times under warranty, & has now failed out of warranty. Where can I find a suitable replacement? My power supply is 250W, is that a problem? The few websites I have found that mention a card's power demand do not show any that low.
It's unlikely your graphics card failed because the PSU was under-rated as bloo meeny implies (Dell under-rate their PSUs anyway), but on account of some other underlying problem. If you don't know what this is, the replacement is likely to fail also. Did Dell ever mention what the cause may be?
Unless you buy a secondhand one, a reasonably good AGP graphics card is very expensive & will require more power to run than your 9800. And it's likely that it will also fail on account of a bad motherboard.
I would buy a new system, rather than keep repairing something that's likely to fail again & again. G