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is a 5850 a worthwhile crossfire companion for a 5870

post #1 of 9
Thread Starter 
So with my new eyefinity setup I am finding that even at 5760x1080 the 5870 handles it pretty well, and frankly because of that I dont want to spend the full amount for a 5870, but I wouldnt mind a little more horsepower, how would a 5850 do in that situation?

Thanks ahead of time
TLP
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post #2 of 9
a 5850 overclocked can beat a stock 5870
    
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by Yoko Littner View Post
a 5850 overclocked can beat a stock 5870
Does that translate to crossfire performance?
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post #4 of 9
There hasn't been a TON of info on this combination but from what i've read it's pretty decent when you overclock the 5850. If you do go this route let us know I'd like to compare my 2x5870 setup with the 5850/5870 setup. I was actually debating going the 5850/5870 route myself, but then I bought a used HIS 5870 off someone here for $190 shipped. And those 5870's have been going on sale recently at newegg and other sites. Maybe wait a bit and see if a good deal pops up?
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post #5 of 9
yes.
    
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post #6 of 9
The 5870 will down clock to match the speed of the 5850. If you get them both running the same speed however, there shouldn't be a problem though.
     
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post #7 of 9
I borrowed my roomate's 5870 to test crossfire with my 5850 before I got a second 5850. I had my 5850 Oc'd to 875/1200 and left his 5870 to stock. I ran heaven stock settings at 1920X1080 with the 5850OC/5870 combo and got a score of around 1675. After I got my second 5850 I was getting around 1495 on the same benchmark at stock clocks, and with the 2 5850's OC'd to 835/1200 I would get around 1595 on the same benchmark.

The 2 5850's had to be ran at slower clock speeds because I had no voltage control over the second card I got.

Hope that gives you an idea
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by killeraxemannic View Post
I borrowed my roomate's 5870 to test crossfire with my 5850 before I got a second 5850. I had my 5850 Oc'd to 875/1200 and left his 5870 to stock. I ran heaven stock settings at 1920X1080 with the 5850OC/5870 combo and got a score of around 1675. After I got my second 5850 I was getting around 1495 on the same benchmark at stock clocks, and with the 2 5850's OC'd to 835/1200 I would get around 1595 on the same benchmark.

The 2 5850's had to be ran at slower clock speeds because I had no voltage control over the second card I got.

Hope that gives you an idea
And thats a good point, need to find a reference design to ensure I have voltage control. Hmmmmm


I really should just hold off, turning AA down at such a high res hasnt really affected image quality but has saved my FPS, just have that itch to get more horsepower
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post #9 of 9
Quote:
Originally Posted by TheLastPriest View Post
And thats a good point, need to find a reference design to ensure I have voltage control. Hmmmmm


I really should just hold off, turning AA down at such a high res hasnt really affected image quality but has saved my FPS, just have that itch to get more horsepower
Yes.... My original card was a Ref card and my second was a crappy xfx non ref piece of junk. It had no voltage control and 850 was the absolute max core clock I could get on it. It was loud and ran hot, and died after a few months.... I am now awaiting RMA so I can sell it off for cheap to help pay for my 570
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