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thinking of crossfire

Mr.Cookie said:
Hi

Thinking of getting a 7970 to crossfire with my windforce 7950 anybody see any problems.

i5 3750
XFX750 PSU


Simon
Click to expand...

Get a 7950 instead of a 7970 to crossfire. If you have a 7970 in there you will have to overclock the 7950 past the 7970 clock speeds to get equal gpu usage. Its just easier and more sensible to use 2x7950's. The HIS Ice-Q 7950 would compliment your 7950 WF well as it exhausts all its heat out the rear of your case.

I have the same PSU for my 7950 crossfire setup so you're fine there.

Make sure you overclock that cpu as much as you can. In a few games it will bottleneck those 7950's slightly. Battlefield 3/4 and Crysis 3 are a few that spring to mind. Generally speaking though, you'll be fine.
 
Cheers, only reason behind getting the 7970 was the today only cost, and thought i'd use it as main card with the 7950 in the second slot, so if a game didn't like xfire i'd atleast us the more powerful one. :)
 
I agree with matt unless your picking up a realy cheap 7970 just get a 7950, if i didnt already have a pair of 7970's then 7950 crossfire is what i would go for
 
without thread stealing was wondering if it was worth going crossfire 7950 when only running one monitoer and at 1080p? would it just be overkill? or a good way to futureproof myself?
my motherboard is x16 and x 4 would there be a big difference with slot 2 only being x4?
cheers chris
 
Chris i'll be at 1080p so will do some benchmarks if you want (and 7950 on offer), any particular games, my mobo is also 16 and 4
 
You lose about 3-10% performance depending on the game/benchmark. Tested 7950 crossfire on a x16 x4 setup. Your mileage may vary.
 
chris-82 said:
without thread stealing was wondering if it was worth going crossfire 7950 when only running one monitoer and at 1080p? would it just be overkill? or a good way to futureproof myself?
my motherboard is x16 and x 4 would there be a big difference with slot 2 only being x4?
cheers chris
Click to expand...

Overkill?
Probably....
Worth it?
Yes

I just crossfired my 7950 and the difference is phenominal!
 
chris-82 said:
thanks for the feedback guys,im very tempted will see what tomorrows prices bring will need another gpu block though!

i have a 650 watt ocz psu this one:http://www.overclockers.co.uk/showproduct.php?prodid=CA-056-OC&groupid=701&catid=123

would this be enough to run crossfire 7950's?
(I5 2500k @ 4.5 1.38v roughly,2 hdd's,1 ssd)
Click to expand...

General concensus is that everything on stock clocks probably just.
However it's PSU related so caution should always be used, most people recommend a 750w (I went for the 850w Seasonic to be certain)
 
Sorry to jump in on this but I too am thinking of cross firing my 7950. Although I think its a Frozr something or the other (not sure which brand).
Would that matter if I crossfired with the HIS?

Also I currently have a Q6600 @ 3.2GHz which I realise is getting on a bit, but is this going to be a significant bottleneck for me in game terms? Have to say so far with my one 7950 all games run silky smooth at 1920 x 1200 with a basic level of AA.
 
chris-82 said:
thanks for the feedback guys,im very tempted will see what tomorrows prices bring will need another gpu block though!

i have a 650 watt ocz psu this one:http://www.overclockers.co.uk/showproduct.php?prodid=CA-056-OC&groupid=701&catid=123

would this be enough to run crossfire 7950's?
(I5 2500k @ 4.5 1.38v roughly,2 hdd's,1 ssd)
Click to expand...

Steveocee said:
General concensus is that everything on stock clocks probably just.
However it's PSU related so caution should always be used, most people recommend a 750w (I went for the 850w Seasonic to be certain)
Click to expand...

I briefly tried xfire 7970 with a 2500K all at stock clocks with my OCZ ZT650w. It ran fine, but who knows how it'd pan out in the long run? I definitely would not recommend OC'ing.
Besides, our PSU's only have one set of 6/6+2 pin cables, so you'd have to run the second card off a couple of Molex-PCIe adaptors like I did which isn't the way to go :)
 
Well card turned up today and is now in system, biggest annoyance so far is the fact that i now cant use 5 of my 6 sata ports :rolleyes: so as i've found power cables for xfxi'll be testing :D
 
All set up and running, had a bit of a muppet moment but we wont talk about that :D

Done a little overclock 1050/1300 and it was all quite happy valley score of 3200, so biting on the heals of 780s and Titans for £400 :D

Only downside so far has been the sata locations on my mobo reducing me to a 64gb SSD as i cant get at any other connections :(

Would also like to that LtMatt for the excelent tutorial :)
Simon
 
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