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Overclocking Gigabyte 7870 Ghz OC Edition in Crossfire issues.

post #1 of 5
Thread Starter 
So I'm trying to overclock these GPU's. I have 2 monitors plugged into the main GPU. 1 Digital and 1 analogue.
Whenever i overclock (with as little as 10 Mhz) I get a strange screen tearing effect happen randomly when moving things around (like windows etc.). GPUTool stress test shows no artifacts... Any idea what it could be?

My Motherboard is ASrock Z77 Extreme 4.

Core Voltage: 1219
Power Limit: +0%
Core Clock: Mhz: 1110 (10 Mhz more than stock)
Memory Clock: 1200 Mhz

The issue happens very frequently when for instance scrolling up and down on a web page.
Edited by LoveTrain - 6/19/13 at 11:44am
post #2 of 5
have you tried plugging the secondary monitor into the 2nd gpu?
post #3 of 5
Thread Starter 
Then I can't do crossfire mode. Crossfire requires that both monitors are plugged into the first GPU afaik.
Crossfire disables the ports on the secondary GPU when enabled.
Edited by LoveTrain - 6/19/13 at 11:47am
post #4 of 5
Thread Starter 
It also happens If I underclock by 10 Mhz. Essentially it just happens when it's not set to stock settings.

Whenever I play a flash video, while the clocks are in any way diffferent (even 1 Mhz) The screen with the flash video will go crazy, like artifacts all over, and then a little later go back to normal. The only way to stop this from happening is hitting Reset in MSI.
Edited by LoveTrain - 6/19/13 at 12:52pm
post #5 of 5
Thread Starter 
So I tried downgrading the bios to an earlier version. Now I get BSOD 0x000007E at start. I can still run with the internal GPU (Intel HD).. Guess I'll have to try and reflash it somehow.
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Overclock.net › Forums › Graphics Cards › AMD/ATI › Overclocking Gigabyte 7870 Ghz OC Edition in Crossfire issues.