Ga-Z87X-D3h Crossfire lacking

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mufcabage

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Sep 13, 2012
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10,510
Hi folks!

I have the GA-Z87X-D3H, along with 2 x Sapphire 7950 Flex edition GPUs. They are installed, powered, bridged, and have Crossfire enabled in CCC.

According to the mobo spec's, the 1st PCIE channel reduces from x16 to x8 in Xfire mode, which it does. The 2nd channel is showing as x4 in GPUz, which is the issue. It should run at x8, and the performance is lacking to reflect that. I get better performance disabling Xfire and going back to 1x16!

My CPU is the Haswell i5 4670-K @ 4GHz.

I've looked through the BOIS and found no way of setting the PCIE channels manually. Have I missed something?

Does anyone use Xfire successfully with this board, and get the 2 x 8 PCIE channels?

Gracias :D
 
Solution
ur6beersaway
You should be in the top (2) 3.0X16 slots. the lowest X16 is the 2.0X16@X4. The (2) pcie X1 slots between the (2) 3.0X16 slots, seem like it would increase the standard X-fire distance between cards, they sell an longer bridge (if needed). As suggested by clutchc 13.10~http://support.amd.com/us/kbarticles/Pages/AMDCatalyst13-10WINBetaDriver.aspx
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mufcabage

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Sep 13, 2012
4
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10,510
There's only the 2 GPUs in the expansion slots - x16 and x8. They're pretty much side-by-side in the case. Besides, would the Xfire bridge reach between slots 1 and 3? It seems like a stretch :p.
I just can't figure out why it seems to be "underclocking" one of them.

Thanks for the input. Will have another look in the BIOS when I get home later.
 
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ur6beersaway

ur6beersaway

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Apr 18, 2013
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You should be in the top (2) 3.0X16 slots. the lowest X16 is the 2.0X16@X4. The (2) pcie X1 slots between the (2) 3.0X16 slots, seem like it would increase the standard X-fire distance between cards, they sell an longer bridge (if needed). As suggested by clutchc 13.10~http://support.amd.com/us/kbarticles/Pages/AMDCatalyst13-10WINBetaDriver.aspx
 
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Solution
M

mufcabage

Honorable
Sep 13, 2012
4
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10,510
Yeah, 13.10 as of last night.
I read through the manual in pdf, and noticed this "When the PCIEX8 slot is
populated, the PCIEX16 slot will operate at up to x8 mode." UP TO x8 mode. So the X16 is running at X4 perhaps?? I assumed it was the X8 running @ X4.
Couple of hours and I'll be able to check...
 
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mufcabage

Honorable
Sep 13, 2012
4
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10,510
I'm using GPUz and the CCC Overdrive window (not overclocking... yet :p) to monitor both cards. Could GPUz be misreporting?
With such a fresh install, I neglected to do one thing - disable ULPS >< After doing so last night, Crossfire seems to be working fine. Seems...
It's hard to tell with a fresh beta driver. All I know is that the 2nd card is working (heavily at times) under load. However, the the 2nd card is still showing X16 @ x4.
I've been using Unigine's Heaven, BF3 and the Intel Extreme Tuning Utility to run the set up through its paces.
 
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clutchc

clutchc

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Apr 22, 2009
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Try using the official driver for your cards. Uninstall the beta driver and run with ver 13.4.
The 1st beta driver locked the 2nd slot @ X1. Maybe the newest beta only allows X4. It'll be a lot of hassle uninstalling the current driver and installing the regular driver, but it would eliminate that as a possibility.
 
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