No dont. It might seem like a good deal but the card is obsolete and its gonna get crushed by the 4870 get that one.
Really? Please link me to these great benchmarks you've got of an unreleased card!!
Dude, the card was released just months ago and it still is beating the new GTX280 in most of the benchmarks. It's not obsolete.
That card at $300 dollars is worth it. I think it's worth it even if you put 100-125$ into a new PSU, just make sure it fits in your case.
BTW, I don't think the 4870 is going to beat the 9800GX2.
^Agreed. The 4870X2 probably will, but not the 4870.
$300 for a GX2 is a steal....I'd say go for it with a new power supply since whatever PSU came with that system is not going to be enough. Overclocking your CPU would help a lot too, although if it's an HP system then probably the BIOS is locked and the motherboard crap (for overlocking at least).