The above post I threw out there quickly because you did say ASAP.
I killed a V5 in PCI when I installed one of them V5 cooling kits (big copper heatsinks, Delta fans, heatsinks for memory, etc.). I believe I was either overzealous in removal of the old paste and scratched the chips a bit too much or maybe I mixed the new paste incorrectly (1:1 Arctic Silver). I'm responsible for killing my own card.
I was using the PCI flavor 'cause I've got a p3 933 on a BX chipset. Fortunately I had the AGP flavor also from when I was using a p3 550. Now I'm scared of ruining another card so I have my 933 running at 700 megs. It's a heck of a thing to have to run a 933 at 700 for probably an unreasonable fear.
Anyway, I hope you're smarter than me and it all works out. I'm sure you are and it will and now I'm just rambling. Good luck!