Gigabyte GA-Z97X-UD7-TH unstable when setting BIOS to PCIe GEN3 or AUTO

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hershbergien

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Jan 10, 2016
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I just built a system using a Gigabyte GA-Z97X-UD7-TH motherboard and an EVGA Geforce GTX 970. When I set the BIOS to PCIe mode GEN3 or AUTO the system fails to boot into Windows most of the time or will crash shortly after logging in. It will always start correctly as long as the NVIDIA drivers aren't loaded or if I use the Intel iGPU.

I have tried the latest NVIDIA drivers as well as those shipped with the video card. I have also tried a different Geforce 970 GTX, the Gigabyte Geforce GTX 970 ITX and it suffers from the same problem.

If I set the PCIe mode to GEN2 then the system is completely stable.

Should I be concerned that I can't use my motherboard with PCIe mode AUTO/GEN3? Should I RMA it?

OS: Win10 64bit
MOBO: GA-Z97X-UD7 TH (rev. 1.0)
BIOS: F6 2015/09/19 (latest as of 1/10/2016)
GPU: EVGA 970 GTX SSC ACX 2.0+
CPU: Intel i7-5775C
RAM: 32GB Crucial (BLT4KIT8G3D1608DT1TX0)

Any advice would be appreciated
 
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cin19

cin19

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Mar 14, 2011
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It will always start correctly as long as the NVIDIA drivers aren't loaded or if I use the Intel iGPU.
Click to expand...
I have also tried a different Geforce 970 GTX, the Gigabyte Geforce GTX 970 ITX and it suffers from the same problem.
Click to expand...
What is your PSU? maybe the PSU does not have enough power for the gtx970. Also do you try the gpu in other pcie slot? Maybe the 1st pcie slot has problem.
Also try update the chipset driver too by using the onboard igpu.
 
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hershbergien

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Jan 10, 2016
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I'm using a Seasonic 650W power supply. The 3v, 5v, and 12v rails are within expected values. The power supply is two years old.

When I put the GPU in slot 2 (and update the BIOS accordingly) it does not recognize the card in slot two. I haven't tried that since I figured out the issue was the PCIe mode.

EVGA tech support confirmed the video card has the latest firmware. I also confirmed the BIOS is the latest version.

I spent about 30 minutes on the phone with EVGA tech support running down their checklist at which point he shrugged and couldn't provide a good answer. I'm still waiting to here from Gigabyte.
 
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H

hershbergien

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Jan 10, 2016
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It wasn't the motherboard after all. It was the Intel i7-5775C CPU. I ran various test configurations with an ASUS Deluxe motherboard with Thunderbolt II support and an i7-4790K. On both motherboards the i7-4790 with the GTX 970 worked in PCIe mode GEN3. The i7-5775C CPU could not run in PCIe mode GEN3 on either.
 
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