Zend certified PHP/Magento developer

GPU struggles only in the primary PCI slot, is this a motherboard issue?

When my GPU is in the primary PCI 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 30fps on Novabench, in the secondary slot I get 90fps.

Is this a problem with the motherboard?

Specs:

  • GPU – Gtx 960
  • Mobo – Asus Z97-AR