I have a Sapphire RX Vega 64 since 5 days ago, and I could not make it work as it should be.
I tried with latest Adrenaline Driver (18.12.1), I tried with crimson (17.11.4) driver.
I uninstalled/reinstalled several times both drivers. (I used AMD Clean Utility and DDU to clean all AMD software).
I disabled the fast boot option on Windows 10, i disabled the HDCP option on AMD Settings.
But i still getting black screens and reboots, (Actually using HDMI, i wanted to get a new display, but with this problem, i don't know).
This happen everytime. With NO Stress/No Load, while PC is on Idle. On windows explorer/desktop. Or on the web, and obviously while gaming.
The Explorer reboots (not PC reboot) It throws a black screen with signal loss and then the windows explorer appear again. Rebooting explorer every few minutes (sometimes constant). And sometimes it's a full system reboot.
Another thing. Windows Startup is very slow with Vega installed (Even the Gigabyte Logo from the booting/bios gets lagged). This is not happening with R9 390 or without GPU installed.
The closest I could "make it work" was getting random "stable booting". Sometimes when I booted the PC, i had no issues,
I could run 3Dmark Firestrike, getting between 22,900 and 22,950 Graphics Score. But if I restarted the PC, problems were back again.
The most of the time is a "bad/unlucky" booting. I was getting desktop lag, mouse lag, windows menu lag.
I've read all similar errors and the recommendations, but I still not able to make it work.
I keep my old Sapphire Nitro R9 390, and it works perfect. Before Vega and after Vega.
I don't know what else i can do.
OS: Windows 10 Pro x64
GPU: Sapphire RX Vega 64
MoBo: Gygabyte - GA-Z97X-Gaming 5
RAM G.Skill - Ripjaws X 16 GB (2 x 8 GB) DDR3
Main Storage: Samsung - 850 EVO (250 GB) (SO, Drivers, etc)
HDD: Seagate Barracuda 3 TB (Games, software, etc)
PSU: EVGA - SuperNOVA NEX 750 W (80+ Gold)
Display: HP - 22cwa (via HDMI)
Please, I need your Help. (Sorry for so much text)