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graphics card - GPU struggles only in the primary PCIe slot. Is this a motherboard issue?

When my GPU is in the primary PCIe slot, I sometimes get loads of garbled sound when I run the audio through the HDMI. The GPU also performs far worse on benchmarks. In the primary slot I get 30 fps on Novabench, in the secondary slot I get 90 fps.


Is this a problem with the motherboard?


Specs:



  • GPU - GTX 960

  • Mobo - Asus Z97-AR

  • CPU - Core i5 4460

  • OS - Windows 10

  • BIOS Version/Date - American Megatrends Inc. 0902, 08/05/2014

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