How to make the lower gpu primary. r9 290 xfire, asrock z77 extreme 4-m

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A

Actech

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Dec 14, 2014
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as the title really guys :) my top card is a reference sapphire r9 290 and the lower one is a sapphire r9 290 tri-x. the tri-x won't fit on top so it has to go on the bottom, is there any way to make it the primary?

any help is greatly appreciated :) full spec below

I5 3570k @ 4.2GHz
Asrock z77 extreme 4-m
Sapphire r9 290 Tri-x and Reference card in crossfire
4x4GB Avexir Blitz 1.1 2133 MHz
Samsung 840 pro 128GB SSD (boot drive)
WD Caviar Green 2tb HDD
Corsair RM1000W PSU

I think that's everything :p
 
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barto

barto

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Apr 20, 2009
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I don't think it's possible, but I could be wrong. Typically, the top most slot configured as the primary card.

For what reason do you want the Tri-X as the primary card? With SLI and CF, both cards will run at the same speed.

 
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A

Actech

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Dec 14, 2014
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4,510
are you sure? it seems to vary, and the tri-x is also a lot cooler so I know it won't underclock it at all

edit; they definitely do not run in sync, just ran valley with 2 GPU-Z's running (so I can see each card at the same time) and this is what I saw. right is the reference and the left is the tri-x

3WiaVPc


I've heard of others doing it on different motherboards was reading a forum post about a guy with an MSI motherboard) but can't seem to find the option on my asrock :/

 
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A

Actech

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Dec 14, 2014
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4,510
well I've given the reference card a small overclock to reach the same as the tri-x anyway (it was less overclock than I was running on it before I went xfire)
 
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