Topic Title: Crossfire 7770 HD performance WORSE than single 6850?
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Created On: 03/02/2013 07:24 PM
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 03/02/2013 07:24 PM
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I recently upgraded my PC a bit, and removed my single XFX Radeon 6850 HD card for favor of 2 XFX Radeon 7770 HD GHz Edition cards in Crossfire. I uninstalled the old drivers, loaded the new ones, got plenty of power and the rig to sustain it. Even installed the Crossfire Application profiles like a few suggested.

But when I get into a game like BF3 (Before I had clean 40 frames with the 6850) I lag and lose frames like crazy, reduced to only maybe 15 frames. AM I missing something?



CPU: AMD FX-8350 8 Core 4.0GHz

Ram: 8 Gigs

Mobo: ASUS ROG Crossfire Formula V

PSU: XFX 650W 80 Bronze Single Rail

GC: Radeon 7770 HD GHz Edition x2 in Crossfire.

The Geek will inherit the Earth.
 03/02/2013 10:23 PM
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With dual 7770s you should be getting about 160% the performance of a single 6850, taking into account the lesser power of the 7770 and loss due to non linear scaling. I'd suggest running the Catalyst Uninstaller (linked to in the Latest News link), shut down, pull the secondary card, reboot, install drivers, shut down, install second card, reboot, install CAPs, reboot again, and see if that works.

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