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Crossfire mismatched cards

post #1 of 16
Thread Starter 
What would happen if I xfire a 7870 and a 7850? Can I do this? Would the result be worth it? I own a 7870 and was trying to buy a second to xfire with, I accidentally picked up a 7850 from amazon (I searched 7870 and this came up, I was stupid and didn't double check) I did get a deal on it but I am trying to decide if I should keep it of try and return it.

7850
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127663

7870
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127662
post #2 of 16
When you Crossfire 2 cards that dont have the same clock speeds the higher card will downclock to the lower card´s speed
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Seravee
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post #3 of 16
It would be as if you had 2 7850s
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post #4 of 16
Thread Starter 
Will I see a large decrease in performance? I'm hoping to run eyefinity on them. If I OC will it help any?
post #5 of 16
You can crossfire both those cards there sould be no problems in theory other then your 7870 would behave more like a 7850
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Seravee
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post #6 of 16
Thread Starter 
I understand that, but how big of a difference in performance would that be? I'm trying to decide if I should return the 7850 (which I think will be much easier if I don't open it) and wait for a deal on a 7870. Or if I should keep it.
post #7 of 16
Quote:
Originally Posted by Z4XC View Post

I understand that, but how big of a difference in performance would that be? I'm trying to decide if I should return the 7850 (which I think will be much easier if I don't open it) and wait for a deal on a 7870. Or if I should keep it.
I think you sould return the 7850 running 2 cards that are not the same models could give you all kinds of problems think you would be better off with 2 of the same cards
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Seravee
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post #8 of 16
Quote:
Originally Posted by Z4XC View Post

Will I see a large decrease in performance? I'm hoping to run eyefinity on them. If I OC will it help any?
find some benchmarks that show xfire 7870 vs xfire7850. From what I just looked up, the difference between the two cards in a single card setup at 1920x1200 res was at most 7 fps. If you're on a 1080p 60 hz monitor you might just want to keep the card since you won't benefit from going past 60 fps anyway.
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SKYnet
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Antec Kuhler 650 ThermalRight True Spirit 140 Power Windows 10 Ultimate 64 bit Samsung 240 HD TOC 
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post #9 of 16
Thread Starter 
Thanks for your help +REP. I'm done here.
post #10 of 16
hmmmm i dont think the 7870 will downclock.... as far as i read they will work at their own speed. and you can always OC 7850 to match 7870 speed.

Because I was searching recently cause I have 7950 and I want to purchase 7970 and ive read somewhere and a forumer made some benches or calculation or so. They work at their own speed......

well best teacher is of course experience. I will know for sure once I purchase 7970 and xfire with my current 7950.......
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