Yes it will work. I have one, and had it installed in a P3 board running 2X. The card supports 3.3V (2X) and 1.5V (4X) slots. It DOES NOT require extra power via the power supply like its bigger brothers. I will tell you that it is a better card than a GF MX series... but it still stinks in my opinion. This is coming from a current user with the 128MB card. Try loking at a NVIDIA Ti4200. It is a little better than the 9000. That is if you have the extra juice from the power supply. I would suggest at least 300 - 350 Watts if you go for any card that requires extra power.
Mack