It very likely will but be careful that the card you get is PCIe version 2.0 not 2.1 since the 2.1 has had issues with motherboards with version 1.x slots which is what I believe you got.
Cheers rolli, appreciated that was one thing I wasn't looking out for.
And dadiggle, it's a brand called high power there supposed to be ok, the 1000 I got retails at £200 and managed to get it off eBay for £15, so a bargain really.