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Question about primary card in a Crossfire setup

post #1 of 3
Thread Starter 
Okay, I just set up my first Crossfire configuration yesterday, after getting a new graphics card.

Right now, I have these cards in my system:
XFX Radeon HD5770 XXX Edition
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150464
MSI Radeon HD5770 Hawk
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127490

Now, their specs are slightly different. Nothing major, but right now I have the XFX in my primary PCI slot, and the MSI in the secondary slot.

Does it make a difference which is in the primary, or shouldn't it matter? I know that the stronger card in a Crossfire will usually lower its specs to match the weaker card, so I didn't know if having the stronger card in the primary slot would make any difference to it being in the secondary slot or not.

Also, how does overclocking work in a Crossfire setup? Do I have to OC both cards separately, or is there a way to do it together? I've never overclocked a graphics card before, but MSI has a lot of OC software tools that comes with it...
post #2 of 3
Use CCC or MSI Afterburner for clocking, and clock each card separately.

Which slot really shouldnt matter. I would say it definitely doesnt matter, but i see strange results with overclocking my cards at different clock rates, and my 'stronger' card as you put it is in my second slot.
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Skeleton
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CPUMotherboardGraphicsRAM
955 BE 4GHz Gigabyte 990FXA-UD3 PC 6990 + Gigabyte 6950(unlocked) 16GB G.Skill 1600 CL8 
Hard DriveMonitorPowerCase
OCZ SSD 51" Plasma + 2x 46" LCD Antec 900W Antec Skeleton 
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post #3 of 3
doesnt really matter which card you put where. but since one is reference cooled and one not configure them so that you save heat if possible. also, there should be an option to enable syncing between both cards for your overclock settings.
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