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Screen out of range errors

Level 7
Hi all. Ok was having "out or range" errors and "no signal" on display (Asus PG279Q ROG Swift 27inch) . Tested GPU and mobo and they seem fine. Tried safe mode but problem persisted. Have tested with another screen and different cables and problem is still there. Swapped to another PCI lane and problem went away for several hours then came back. Swapped to a different GPU port (video out) and problem went away but has come back. At the moment I am swapping between PCI lanes whenever problem comes back. I have updated drivers with no change. I have stress tested both GPU and CPU to see if any errors come up but nothing. I've changed to lowest settings with and without gsync and still the same errors. I have been told to RMA mobo and cpu as the cpu is now suspect. Anybody know what else might be the cause?
Case: Phanteks Enthoo Primo
Mobo: Asus Maximus viii Extreme
CPU: i7 6700k @4.6
HDD: 3 X Samsung 1TB SSD 850 PRO SATA 6Gbps
Ram: 16g DDR4 Extreme Group 3733Mhz
CPU Cooler: Corsair Hydro Series H110i GTX
GPU: ROG GTX 980ti Matrix
Sound: Asus Essence 7:1
Optical: Pioneer BDRW
PSU: Corsair HX1200i 1200W '80 Plus Platinum
OS: Win10 pro x64