If you're owner of a FX5900 (non ultra) graphic card, you might be interested in this story.
There have been few reports on the net lately, stating that is possible to mod it to FX5950 Ultra, simply by flashing it's bios, with the bios of 5950 ultra, possibly by the same manufactured.
Well, I tried it yesterday, and it's absolutely true, and now I'm happy owner of this high end graphic card.
Drivers are reporting now FX5950 ultra, which is the same card as 5900, only clocks are now much higher, from 410/7? to 475/900, resulting in increase from 5000 to 6100 3dmarks. I might OC it a little bit more, but I didn't have time to play with that yet.
It works fine and there's no smoke coming out of it.
My model was Gainward 5900, 256mb RAM (not a golden sample), so if you're buying new card, consider this one, I'll be happy to send you the bios which worked with me.
My friend did the same thing with Radeon 9800, and he has 9800 pro, but I don't know any details.
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Bojan Tarticchio