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Old 19-09-12, 12:51 AM
RalphWasntHere RalphWasntHere is offline
Join Date: Sep 2012
Posts: 3
Crossfire 7850 Bandwidth Issues

Just installed my second 7850 today. Everything went fine, no hiccups whatsoever. I boot up, reinstall fresh drivers, and reboot. Then I go and check GPU-Z. What's this?? The second card is being choked of bandwidth! Card numero uno has a bus width of 256 bits while numero dos only gets 32 bits! What gives? I checked CCC, and yes, Crossfire is enabled, so that isn't the problem. What can I do to fix this?

Another thing, the first time I benched with two cards, I got 'correct' performance, that is to say, Heaven scores roughly doubled. But once I applied a relatively minor OC of 140mhz, things went to ***- Heaven ran worse than if I only had one card. I cut the OC, then it continued to suck.

System specs:

i7 3820 @ 4.625ghz 1.3v
ASUS X79 Sabertooth
Phanteks PH-TC14PE_BL
2x HIS Radeon HD 7850
Corsair Force GT 240gb
Corsair TX650M
NZXT Switch 810

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7850, bandwidth, crossfire

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