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CrossFire HD 7770 on a x16 x4 Motherboard

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  • Graphics Cards
  • Motherboards
  • HD
  • Graphics
Last response: in Graphics & Displays
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September 6, 2012 12:35:56 PM

Hi,

I have a GA-970A-DS3 motherboard with a HD 7770 running as a single GPU. I've just upgraded to a high resolution monitor (1920x1080), and I'm thinking of dropping in another 7770 for the extra performance in a couple of weeks.

I think with the PCI-E lanes available, this motherboard should support CrossFire. However, I'll have to go with a x16 x4 pairing. Will this effect performance significantly?

More about : crossfire 7770 x16 motherboard

September 6, 2012 12:40:36 PM

Nooooooooooooooooooooo no no no no no no no no no no no no. That's a horrible idea. Crossfiring 7770s is already a poor choice and doing it on a x16/x4 board = :non: 

If you need more performance, sell the 7770 and pick up something more powerful. You shouldn't crossfire anything on x16/x4.
September 6, 2012 12:53:16 PM

BigMack70 said:
Nooooooooooooooooooooo no no no no no no no no no no no no. That's a horrible idea. Crossfiring 7770s is already a poor choice and doing it on a x16/x4 board = :non: 

If you need more performance, sell the 7770 and pick up something more powerful. You shouldn't crossfire anything on x16/x4.


That's OK. I kind of wanted to get a few opinions on this, as I've read that:

a) The HD 7770's scale quite well in CrossFire (Eteknix HD 7770 CrossFire performance review)
b) The loss on a x16 x4 pairing isn't that bad, courtesy of Tom's Hardware (Tom's Hardware: Does CrossFire work at x16 x4?)

But I'm still unsure. How come it's a bad idea to go with the x16 x4 pairing (minus the loss of say 10FPS)?
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September 6, 2012 1:04:34 PM

Well you're always welcome to try it, but here's my thought:

You will lose at least 10% on average over the best case:


That puts you down below 7850 performance territory (which is about the 6970 on that graph). Combined with the issues attendant to a crossfire setup (driver headaches, microstutter, etc), I think you would be better off selling your 7770 and picking up a 7850: The resultant cost shouldn't be much more than the cost of adding a second 7770 and the resulting experience will be much better for you.
September 6, 2012 1:43:53 PM

I can definitely see your point now, cheers. The 7850 sounds like a better idea.
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