JJ1217 :
They'll perform basically exactly the same. It really depends on the price. I would go for the Sapphire if its cheaper, if they're both the same price, go for the Asus card.
Sapphire is a little costly.
the mobo i have selected is - ASRock Z77 Pro 3 Motherboard
cpu - Intel 3.4 GHz LGA1155 Core i5 3570K Processor
psu - Corsair CMPSU-500CXV2UK 500 Watts PSU
and cabinet is corsair 300r,
which gpu would you suggest, and please speify as to why? if possible...
and do these both gpu support windows xp??
any other suggestion is welcomed... Thankx