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ATI 5870 and 5970 crossfire?

Last response: in Graphics & Displays
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February 13, 2010 6:55:34 PM

Hi everyone,

Is it possible to crossfire an ATI 5870 and an ATI 5970 on a ASUS Rampage II GENE motherboard?

thanks a lot :) 
a b V Motherboard
February 13, 2010 8:15:24 PM

Ye....yes. HD5970=2x HD5870. Though the HD5870 will underclock itself a bit.
a b V Motherboard
February 13, 2010 8:34:48 PM

Yes you can crossfire them. No the 5870 will not downclock itself, as long as it doesn't overheat anyway.
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a b V Motherboard
February 13, 2010 8:54:31 PM

A 5970 is two underclocked 5870s that performs equal to two 5850s. I suggest you OC the 5970 a bit so it performs equal to 2x 5870s.
February 13, 2010 9:07:46 PM

ok cool. As i've ordered a 5870 which should be coming on monday and i wanted to crossfire it with a 5970 instead of buying 2 5970s which is a bit over priced.
a b V Motherboard
February 13, 2010 10:04:58 PM

megamanx00 said:
Yes you can crossfire them. No the 5870 will not downclock itself, as long as it doesn't overheat anyway.



Really? I don't recall that, :p .
February 13, 2010 10:29:33 PM

I reckon the 5870 will downclock itself because isn't crossfire basically a replication of graphics cards to boost power. The 5870 will try to replicate the 5970 so it will change its setting accordingly?
a b V Motherboard
February 13, 2010 10:39:22 PM

When oc'ing card A, and then crossfiring it with stock card B, A will downclock itself. The HD5970 uses the HD5870 core/EVERYTHING, just downclocked.
February 13, 2010 10:46:55 PM

Not all the time, I remember some guy SLI'ing 2 7800GT's and his ASUS one (OC'd) kept its clock, his Zotac one (Stock) overclocked itself.
Either way with a good PSU you can OC the 5970 just as much if not more than the 5870.
February 13, 2010 11:00:12 PM

I thought SLI was different than Crossfire. If my info is correct SLI dose not downclock the faster of the two cards, this was patched back in the 17#.## drivers? And Crossfire has allways downclocked the faster card. Dont know if my info is old, havent heard anything about this in awile.
a b V Motherboard
February 13, 2010 11:32:13 PM

+1lovepoint for paperfox. <3
February 13, 2010 11:50:04 PM

I'm just saying, both CF & SLI can be erratic at points.
!