PSU and GFX card spec

[Epburpee]

I want to buy a GFX card that I'll be able to SLi a few months down the line and also one that will work with my system. Is the Sapphire 11179-09-20G HD 6870 1GB GDDR5 or are there better deals/choices at the moment. I've got £200 tops for it.

Mobo - Asus p8z68 V Pro :
RAM - 8GB KG-Skill Ripjaw (DDR3, 1600Ghz):
CPU - Intel Sandybridge i5 Quad 3.3Ghz;
GFX - ?????? £150
SC - Asus Xonar D1 7.1 PCI Sound Card
PSU - 800W Corsair Gaming Series; £80
Cooling - Corsair CWCH60 Water Cooler
HD - 320 gig Seagate Bara. 3.5" 72rpm

Can some1 tell me what difference will be with SLi in terms of performance ? I've never really known about it or how much it improves gaming, and don't know what to expect.

Will I need more than 800W? If so whats a good 900W psu choice?

Cheers for any help

 

[Sasahara]

Make sure it has 2 GB Ram. Buying a 1GB card for a power user would be a mistake.

 

[shadow_boxer]

Make sure it has 2 GB Ram. Buying a 1GB card for a power user would be a mistake.

Depends on the resolution he's playing at. I would go with either a GTX560Ti or a 2GB 6950 which is right at the top end of your budget. You should be able to pick up a fairly good deal on another 6950 when the next genation 7xxx cards are released as people with no doubt be looking to upgrade.

 

[Epburpee]

Thanks. My friend is going to give me an old ATI radeon which I think I might use to tide me ove till there's some better deals on GFX cards. The mobo has got some integrated gx too