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- Jan 10, 2012
ati has changed the naming structure, what 7000 card equals the 200 card and what will xfire with what?
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7970=?
- Thread starter caddi daddi
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OP
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- Jan 10, 2012
- Thread Starter
- #3
what about my 7850 and 7770?
OP
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- Jan 10, 2012
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- #6
ok, here is what I found at the amd site, it looks like the cards have to be the same family, 79xx with a 79xx and so on.
it also looks like the 79xx cards will not crossfire with the 280x cards, I would have thought this would be possible as the 280x and 79xx cards are the same, or so I thought.
it also looks like the 79xx cards will not crossfire with the 280x cards, I would have thought this would be possible as the 280x and 79xx cards are the same, or so I thought.
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- Jan 12, 2012
AMD 7770 is the R7 250X CD, 7850 = R9 270.
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- Jan 12, 2012
On this note, when crossfiring does it need to be the same Brand and Model card?
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No. You can interchange brands. You can crossfire different models, but the higher performance card will downclock to the lower performing cards levels/speeds.
OP
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hhhmmmmmm, I have never tried running them at different frequencies, I have only set them both to the lesser card with my gtx 760's.
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Interesting. Didn't know that. You'd figure it would cause issues in xfire having two cards running at different speeds. Or it would just negate the speed increase on card 2 and not use the extra 100mhz of processing power.
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Sorry if I wasn't clear, I meant for example two 7970's with different clock speeds. Though my question was answered so thanks.
OP
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so, I can recall my asus top 7970 from prison and crossfire it with the other card I have on the way!!!!!
oh!!! wait!!!! that sucks, why did I buy the gtx770 then..........
oh!!! wait!!!! that sucks, why did I buy the gtx770 then..........
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- Feb 6, 2011
Nope, both cards run at different speeds.
As an example, I ran 3d mark11 yesterday with both cards@1100 and I got this result:
http://www.3dmark.com/3dm11/8867378
Then one@1100 (as it crashes above 1125MHz) and the other@1200 and I got a (much) higher score:
http://www.3dmark.com/3dm11/8867882
http://www.3dmark.com/3dm11/8867378
Edit: there is a 100MHz CPU speed, but that will never count for 5% extra, which is closer to the 2nd card GPU core increase divided by 2.
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It may not show in scores, but I bet it increases latency. There is some activity that has to sync that mis-match up. I would run both the same... but perhaps that is more my OCD talking than any facts.
This is more along the lines of what I was thinking. There's got to be *something* that get's slowed down by the difference in speed. Microstutter?
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