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Crossfiring question

Last response: in Graphics & Displays
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January 27, 2011 1:52:31 AM

Hello, i recently bought a new computer and i got a 2GB GDDR5 AMD Radeon HD 6950. I would like to crossfire these in the future with full potential and was wondering if it was possible with this set up, heres some of the specs not sure if they are all a factor.


Intel Core i7-2600K OTB 4.1GHz
8GB Dual Channel DDR3 at 1333MHz, AVDT
1TB SATA 3Gb/s,7200RPM
CPU liquid coooling
875 Multi-Gpu approved power supply ( i know ill have to upgrade this, not to sure how much higher ill have to go)

Slots
Memory Slots

MicroATX Motherboard
4x 240-Pin DDR3 SDRAM Slots

Internal Expansion Slots

(2x) PCI-Express x16 (electrical spec: x16/x1 or x8/x8 for dual graphics)
(2x) PCI-Express x1


Not to sure because the card says it needs x16 and this says for dual gfx ill only be doing x8 and x8 so that would mean id only be getting half from both so there would be no point? let me know im kinda new with this - thanks! =-)

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a b U Graphics card
January 27, 2011 3:07:21 AM

you will not be resricted by much with 8X8 with 6950s, when looking at 5870s at 8X8 motherboard, they only loose a couple percent of performance, the 6950 is not much higher performing then that... and I plan on running dual 6870s (once I grab a second gpu) on an 8x8 msi crossfire board. What is the make and model of your power supply? You might not have to replace it as 6950s draw relatively low power compared to most cards in its class.
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January 27, 2011 10:59:29 AM

Nice, uh well im not to sure what the make and model is... haha does this help?

Chassis
Motherboard and Chassis Form Factor

MicroATX Motherboard, Mid-Tower Chassis

i got the Aurora R3 model with the upgraded 875 power heres the link i cant seem to find the make.

http://www.dell.com/ca/p/alienware-aurora-r3/pd.aspx?c=...
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a b U Graphics card
January 27, 2011 11:43:47 AM

jjb8675309 said:
you will not be resricted by much with 8X8 with 6950s, when looking at 5870s at 8X8 motherboard, they only loose a couple percent of performance, the 6950 is not much higher performing then that... and I plan on running dual 6870s (once I grab a second gpu) on an 8x8 msi crossfire board. What is the make and model of your power supply? You might not have to replace it as 6950s draw relatively low power compared to most cards in its class.

Do you have benchmarks of this? I'd be interested to see a review of 6950/6970's at 8x/8x and 8x/4x.
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a b U Graphics card
January 27, 2011 12:05:04 PM

x16x16 is only about 4% faster than x8x8 on average, so you're not losing much. It's x16x4 or even x8x4 that you need to be wary of. There should be no x4 in any graphics set up, ever.
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a b U Graphics card
January 27, 2011 12:19:18 PM

Dougx1317 said:
Do you have benchmarks of this? I'd be interested to see a review of 6950/6970's at 8x/8x and 8x/4x.


8x 4x is gonna hurt you, but 8x8x is fine. Forget where I saw that it was a bench from a while back and I forgot where I got that sorry
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a b U Graphics card
January 27, 2011 12:20:42 PM

good god thats an alienware the psu better be quality, you cannot find out the make and model of the psu? open your case... go to run and type dxdiag and hit enter that should bring up your system specs and please post them
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January 27, 2011 9:47:23 PM

Just orderd it, i dont have it yet. The crossfire option that they had i didint want so i picked there most expencive single card and was hoping to be able to crossfire once i got the computer. Just wanted to check with the pros befor i wasted money on a second card.
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January 27, 2011 10:32:02 PM

oh, and if the x8 x8 isint going to slow me down to much how about the 875 w power supply? because if thats adequate i would like to purchase my second card right now =-).

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a b U Graphics card
January 27, 2011 10:36:32 PM

The 875W power supply should be fine for any two graphics cards. Go ahead and grab your second card. You'll have one heck of a computer. Enjoy it.
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a b U Graphics card
January 28, 2011 12:51:39 AM

yeah as long as it is isnt some no name 875w psu delivering low amps across several 12v rails...
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a b U Graphics card
January 28, 2011 12:52:30 AM

but if its a psu that alienware outfitted you with then I would think it would be fine, I mean damn
you already paid 1500 for the freakin desktop which is outrageous if you ask me
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January 28, 2011 10:18:53 PM

Haha, ya i know it is way more then you would pay to make it. i been looking at alienware computers for like 6 years and alwase wanted one, and not being able to build my own im hoping they will have set me up with a good system.
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a b U Graphics card
January 28, 2011 11:12:47 PM

It looks like they will set you up with a very nice system. It will be even nicer once you get that second card in it.
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!