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Issue with crossfired 7850's

post #1 of 8
Thread Starter 
Hello,

I've searched for my specific issue but cannot seem to find the correct tissue.

i5 3570k (oc removed for crossfire config)
Corsair RM750 psu
Windows 7 64-bit
ASUS HD7850 2gb (stock clock at 860)
Powercooler HD7850 2gb (stock clock at 910)

I recently purchased a Powercooler HD7850 2gb from this forum and decided to crossfire it with my current ASUS HD7850 2gb.

I have no issues when running the Powercooler as my primary card except heat - With Heaven and 3dMark I'm running about 90C on the powercooler and 54C on my ASUS card. I know the ASUS has the better cooling performance so I figured I would go ahead and run the ASUS as my primary and have the Powercooler run as secondary in my x8 slot.

When I run the ASUS as primary and the Powercooler in the x8 slot I have immediate system freeze when I enable crossfire through CCC. I have followed the typical remove drivers, install primary card (ASUS), shut down, install 2nd card w/o bridge, let drivers install, shut down, install bridge, then enable crossfire but I still have the system freeze when I click "enable crossfire".

I figured at first that my psu (at the time a Corsair 600m) was not giving enough power from the rail for both cards (which was a dumb idea since switching the cards had no power issues). Alas, I needed to upgrade the psu anyways, so I grabbed a RM750 which had 2x 6pin pci-e cables. The same issue is still present with the new psu.

Now, I'm starting to think the issue lies in the clock speeds of the Powercooler. It is factory clocked to 50mhz higher than the clock of my ASUS. I know the system will automatically downclock the higher MHz card but I'm not sure if that only happens when the higher clocked card is the primary in the x16 slot.

I guess my question is whether or not the higher MHz card will automatically downclock if it is the secondary card?

If that isn't the issue I'm completely stumped.
post #2 of 8
install powercolor and MSI Afterburner to set core manually to 860 then add in CF and see if that makes any difference.

can also check out this link if you want to fix those temps on that powercolor-
http://www.overclock.net/t/1203636/official-amd-ati-gpu-mod-club-aka-the-red-mod

couple more links that may be of interest-
http://www.overclock.net/t/560996/xxcrossxfire-clubxx-because-ones-not-enough
http://www.overclock.net/t/1231670/official-the-amd-radeon-7800-owners-club
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HAF Dragon
(17 items)
 
Blue Dragon
(11 items)
 
W10M
(8 items)
 
CPUMotherboardGraphicsGraphics
AMD FX 9370 Asus Crosshair V Formula Z Asus R9-290 DCUII ~ ɌЭÐ M§D Asus R9-290 DCUII ~ ɌЭÐ M§D 
RAMHard DriveHard DriveHard Drive
AMD Radeon™ RP1866 Performance Series OCZ VERTEX 3 OCZ VERTEX 3 Seagate Hybrid drive 
CoolingOSMonitorKeyboard
CoolerMaster Seidon 240M WINDOWS 7 ULTIMATE 64-BIT BenQ XL2420T LOGITECH G19 
PowerCaseMouseAudio
Coolmax 1200W gold+ Coolermaster HAF 912 LOGITECH G300 Sound Blaster Tactic 3D Omega 
Other
ASUS PCE-AC68 WIRELESS ADAPTER 
CPUMotherboardGraphicsGraphics
AMD FX 4130 MSI 990FXA-GD80 MSI 7870 HAWK MSI 7870 HAWK 
Hard DriveOSMonitorKeyboard
OCZ VERTEX 4 WINDOWS 7 ULTIMATE 64-BIT BenQ XL2420T LOGITECH G19 
PowerCaseMouse
seasonic m12II 850w ANTEC NINE HUNDERED LOGITECH G300 
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post #3 of 8
Thread Starter 
Went ahead and downclocked the Powercooler to 860 to match the ASUS but still run into the system freeze. This time I was faced with a BSOD after a few flicks of the monitor screen.

Thanks for the links
post #4 of 8
Thread Starter 
Bump to hope someone has an answer for this issue.

Thanks
post #5 of 8
What drivers are,you running ?? Could you try the 13.12 driver as they were mist stable for me when i was running my 7850's with an OC
post #6 of 8
do the normal uninstall and install of driver included in the steps you took but this time before rebooting to install new driver - clear your cmos.

now, before enabling crossfire in ccc, make sure overdrive is disabled and in msi - check the box to sync the gpus, then enable crossfire.

installing driver: just use the latest whql (13.12) to uninstall the existing driver and use express, then shutdown, then clear the cmos.. run 13.12 again to install it using express again.
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Second Intel Rig
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1000 360/240 10 64 28 2160 
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850 540 
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post #7 of 8
Thread Starter 
Sorry for the delay.

All instructions were followed - Uninstalled all AMD drivers, shut down, reset CMOS, installed 13.12, rebooted, then froze on the windows login screen.

I figured, ****, maybe I shouldn't have had the 2nd gpu in when I installed the drivers. So I redid the steps without the 2nd gpu in and loaded everything without any issues until I installed the 2nd gpu and had the same system freeze.

I'm flabbergasted and at this point I think I've come to the realization that this mobo simply does not want the powercooler in the x8 slot.

I guess I'll look into aftermarket gpu cooling
post #8 of 8
Thread Starter 
Instead decided to reseat the stock cooler on the powercooler and cleaned the stock thermal and replaced with some random AS5 that I had sitting around.

Ran a few tests at full load and didn't pass 65C. I suppose the powercooler was just pleading for attention and I wasn't giving it enough. Typical
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