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Xfire 5850 Core Clock Fluctuating

post #1 of 2
Thread Starter 
Hey guys,

Just need something clearing up.
I have crossfire 5850s, ones a Sapphire and ones a MSI.

I have 2 monitors attached to the first as monitors don't show up on the second if you xfire. I don't think anyway
Maybe something else needing clearing up.

Well obviously seeing as the second doesn't have any monitors attached, at idle it runs at 157/300

But my first GPU runs at 400/1000 which is understandable with 2 monitors but the core clock fluctuates betwen 725/400mhz constantly and pretty consistently. Here have a looksie


Just wondered if its a bug or thats just how it is.
Thanks
Luna
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Luna
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post #2 of 2
The core clock shift has got nothing to do with the number of monitors. Its a feature built into the GPU to save energy (like cool n quiet in case of amd cpus). There are 2/3 predefined "performance states" in the ATI gpus. When the graphics card is not in full use, it throttles down to save some energy. My XFX HD5770 has three performance states.
1. gpu 400MHz, mem 1200MHz, vddc 0.950v
2. gpu 600MHz, mem 1200MHz, vddc 1.000v
3. gpu 850MHz, mem 1200MHz, vddc 1.200v
Hope this helps you.
    
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