video card (bought a new one but having problems)

hey guys, so i bought a new video card which is supposed to be better than my current one but when i installed it and tried some games they barely worked (cyrostasis ran so slow i had to stop playing, and i tried doom 3 but it didnt work at all and said the video card couldnt handle the game settings)

my pc specs are

windows xp home edition, intel core 2 duo cpu E4500 (2.2 ghz), 2 gigs of ram, Nvidia geforce 7800 gtx video card (256 mb) , sound blaster X-FI audio sound card,200 gig hard drive.

the new video card i bought is an ATI RADEON HD 4670 (1 gig)

is that card actually better than the card i have? if yes then why does it seem to be worse. (one of my friends told me that the card is not compatible with windows xp cause its a 64 bit card but the card comes with 32 bit drivers and says that its designed for xp and vista)

the card you bought is better than the card you already have.check the connections from the power supply are right.what power supply do you have?

i have no idea what my power supply is. i know nothing about computers. my old video card has a 6 pin connector that connects to a black and yellow cord that connects to the power supply but the new card doesnt have that, it only connects through the gold connector on the side of the card

i have no idea what my power supply is. i know nothing about computers. my old video card has a 6 pin connector that connects to a black and yellow cord that connects to the power supply but the new card doesnt have that, it only connects through the gold connector on the side of the card

wardragon

These guys are right, check your power supply. It may not be enough to run your graphics card.

i just looked inside my computer case at the power source. i have an enermax eg565p-ve (565 watts) the new video card only requires a 400 watt power supply

ok thanks guys. i was thinking maybe the card wasnt compatible or something because of the big 6 prong connector that the old car has and this one doesnt