Hi everyone.
I have built my rig around a Gigabyte H370M DS3H, with an i7 8700K and 16GB of DDR4 RAM Corsair Vengeance LPX 2400MHz (dual channel kit).
Intel 5 series 512GB M.2 SSD and a Kingston 240 GB SATA SSD.
In the last 3 months I changed 4 times my GPU.
Before people start to ask why AMD graphics: I need it because I'm also running Hackintosh.
1 GPU: Sapphire NITRO+ RADEON RX 580
on main PCIE slot it would boot but I would get a very laggy BIOS and in Windows it would crash when installing the drivers;
second PCIE slot it worked flawless but limited to 4x;
2 GPU: XFX RADEON RX 580 GTS XXX:
no problem with PCIE slot but drivers were buggy; constant driver crashes;
3 GPU: KFA2(Galax in N.America) GeForce GTX 1070 Ti EX-SNPR WHITE
no problems what so ever - worked like charm;
needed to replace it because Apple - nVidia feud over Mohave drivers
4 GPU: Sapphire NITRO+ RX Vega 64:
PC would boot 90% of the times:
MEMTest - no memory errors;
when restarting I get 5 short beeps and no image (according to Gigabyte manual error is for bad CPU);
but after a few CTRL+ALT+DEL or Power Off-On cycles, it POST's normally and boots in Windows;
sometimes (1-2% of times) it's very laggy when it boots in WIndows;
swapped PSU from a Zalman 700W to a Segotep GP900G 800W;
I've reset the BIOS n-times, flashed all available BIOS versions, set-unset CSR, swapped PSU for a better one etc. but the 5 short beeps are still there.
I am starting to suspect the main board might be faulty.
I'dd appreciate some help!
Thank you
