Considering 2 6850s crossfire but im concerned about power consumption

[fatalshot808]

APPROXIMATE PURCHASE DATE: (e.g.: this week (the closer the better)) Around $400

USAGE FROM MOST TO LEAST IMPORTANT: Gaming(Starcraft 2, Bad Company 2, Bioshock 2, and Etc), Browsing, Movies.

CURRENT GPU AND POWER SUPPLY: 750 Corsair PSU

OTHER RELEVANT SYSTEM SPECS: Motherboard would be ASUS P7P55 LX LGA 1156 Intel P55 ATX Intel Motherboard, 4 Gb of RAM, Intel core I5 750 CPU @ 3.8 GHZ, Right now I'm using a 5770 but Long story short I have to sell it in another system that I've built.

PREFERRED WEBSITE(S) FOR PARTS: Newegg

PARTS PREFERENCES: I wanted to get two HD 6850 Cards but I was concerned about the power usage. I have a 750 Watt PSU

OVERCLOCKING: Crossfire

MONITOR RESOLUTION: 1920x1080 Resolution

ADDITIONAL COMMENTS: Would like to run most games at 1920x1080 the Primary games I will be playing are listed above.

Thanks in Advanced!

 

[mosox]

1 x PCI Express 2.0 x16 (single at x16) 1 x PCI Express 2.0 x16 (at x4 mode, 2.5GT/s)

Your second PCIex16's speed is too low for another video card, it should be x8 or x16 not x4 so no SLI or CF on that mobo.

You can get a HD 6870 now or wait a few weeks for the new HD 6950/6870 that will show up this month.

 

[fatalshot808]

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131620 So if I'm running 2 cards its going to be at 4x mode not 8x each??

 

[mosox]

One will run at x16 and one at x4 - not good. Wait a while for the HD 6950 and you're set. Not the PSU is the problem but the mobo.

 

[jyjjy]

It's a PCIE 2.0 system which means the x4 isn't a big deal. It really shouldn't limit an HD6850 at all. There's a fair number of articles on the subject if you look around.
Also your PSU can easily handle 2 of those cards.
That said waiting a few weeks and getting an HD6950 or HD6970 is probably a better idea. It is always best to use crossfire/sli as an upgrade path rather than a starting point.

 

[fatalshot808]

I heard the power was fine from a few people but for the Crossfire bottleneck I didn't know that. Thanks! I was about to buy those 2 cards but I guess I'll wait.

 

[fatalshot808]

Best answer selected by fatalshot808.