Hmm have i made a boo boo...?

Ive just purchased a Sapphire HD3870 512MB GDDR4 PCIE Dual DVI

I am running a Pentium 4 HT which does have a PCI Express connection...

Im now having doubts as too whether this new card will work...

Will i need a Dual Core Processor and therefore a more meaty motherboard?

This pc is over 2 years old...

Ive read this card has big power supply requirements but then other conflicting statements that it can run on more standard PSU's.

A slightly worried Gil