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Crossfire OC'ing help

post #1 of 4
Thread Starter 
I have a 6770 and 5770 in crossfire right now, and i originally had just the 6770 alone overclocked to 950/1320 compared to the 850/1200 stock
Temps were fine, stayed around 60 degrees on full load
Now i just got the XFX hd 5770 to put into crossfire, and the temps are pretty hot, best i could do was get 900/1250 because temps would get around 75 degrees, sometimes right around 80, and that seems way too hot
So my question is, can i run 2 cards in crossfire with 2 different clocks, or would the 5770 just bring my 6770 down?
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AMD Phenom ii 1090T GIGABYTE GA-990FXA-UD3 AM3+ HIS radeon hd 6770 MSI Hawk hd 5770 
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My PC
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CPUMotherboardGraphicsGraphics
AMD Phenom ii 1090T GIGABYTE GA-990FXA-UD3 AM3+ HIS radeon hd 6770 MSI Hawk hd 5770 
RAMHard DriveCoolingOS
8gb G skill sniper Western Digital 500GB caviar blue Noctua NH-D14 Windows 7 Home Premium 
PowerCase
Antec Earth Watts Series 750W Thermaltake Element G 
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post #2 of 4

Yes, AMD cards can work at its own core/memory clocks and voltage independent of its sibling in crossfire. Just make sure they sit at x16/x16 or x8/x8 or x16/x8 will be fine too but minor stuttering will be there. If you are not sensitive to it, just ignore it.

 

The 6770 must be the primary and 5770 as secondary card due to slight spec difference in 6770.

 

Edit:

 

It's not true that the clocks will be lowered to match the slower card.


Edited by Ken1649 - 12/21/11 at 7:13am
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ケンジ
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post #3 of 4
From what I understand, you can for sure overclock them separately, but in crossfire they will drop down to the lower clock, which in your case is the 5770 clock.
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post #4 of 4
I know that in the past Crossfire used the lower clock speed, but I believe with CrossfireX you can have 2 separate clock speeds.
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