Well see thats what i was told about the Visiontek2400, and thats what i thought, but using the beta 8.9 drivers , the 2400 is working better then ever, i can my older games much better.
Now with the 8400GS, it played Crysis better, but that was about it. My 6200 OC ran circles around the 8400GS in terms of overall performance. I don't believe any of these PCI cards is held back because of my computer, i think its a driver issue.
There was about 6 older titles 1999-2004 pc games that was choppy as hell using the 2400HD, but again using the 8.9 those games work just fine, getting around 60-92 fps. I think with the 8400GS card, either the PSU required was too strong = 300 or the card is actually weaker then the 2400 and 6200.
The 2400 PSU requirement is 270
The 6200 - 250
Maybe under 300watts is my limit. And maybe you are right now, because there are a few other folks who bought the 8400GS PCI and they can play Bioshock and other games with ease. So yea maybe you are right. Maybe the 8400GS is just one of those cards which i can't use. who knows. I am buying the 8500GT next tho and see how it does.