Any ideas why a PCI-E 3.0 video card would be stuck in 2.0 mode? It idles in 1.1 mode, then when you stress it, it only goes to 2.0 mode. It's set to Auto in the BIOS. Setting it to Gen3 makes the system not boot. This is running on an MSI Z97 Gaming 5 with an i7 4790K. So, it can't be the CPU not having PCI-E 3.0 controller/capability.
The video card is an Asus Strix GTX 980.
The video card is an Asus Strix GTX 980.