Hello,

I've got 2x R9 290 4GB, 1x 470 4GB, 1x 570 4GB. 750W 80GOLD PSU
I've mined for about 1 month with these 4 AMD GPU's without any trouble.
HW set up was my personal PC: HP Pro 3500 MT with i7 CPU 3370 and 16GB DDR3 on Windows10.

I thought that would be a waste of HW and bought ASUS P5W DH on i975x with Core2Duo E8400, installed Windows 7 SP1 as Win10 reboots by itself after updates.
PC boots normally with 3 cards attached, but with 4 freezes on "Starting Windows", keyboard light goes off and screen freezes. Safe mode is also unable to boot.
I've tried to remove each and every card, as well as use different PCIE ports but it always boots up with 3 cards, freezes with 4.

Would that be an issue with PCIE lanes provided by CPU?
I've read that 4 GPU's are possible to work on i975x chipset.

Drivers are up to date - I installed INF_allOS_9.1.2.1008_PV.exe

Any advise? Maybe BIOS settings?

Regards,
zeezoo