Hi all,
I?m really struggling here. I am a beginner when it comes to mining and no computer wizard either. Anyway, I have built a rig based on the ASRock H110 Pro BTC+ and I currently run it with 4 Radeon Vega 64 cards. I am using the Cast XMR Monero miner together with the AMD Blockchain driver (Version 17.30.1029).

After some trial and error, tweaking here and there and many hours reading posts in forums, Googling and Youtube watching I was able to make the rig work beautifully with 3 Vega 64 running for days and achieving hash rates between 1600-1900 H/s for each card.

However, when I added a fourth Vega 64 to the rig I am suddenly unable to get the Cast XMR miner to recognize the AMD Blockchain driver and I get the, to many, familiar error message "[Suspicious link removed]pute driver NOT detected" when I start the miner. I did run into this problem also before I got the rig working with 3 GPUs and solved it by using the method of toggling of the HBCC Memory. However, this workaround does no longer solve the problem and I end up with each of the four cards producing hash rates of around a 1000 H/s.

Do any of you bright people out there have any idea of what I should do??

Br, Johan

The rig consists of:
ASRock H110 Pro BTC+
4 Radeon Vega 64
1600W PSU
8GB Ram DDR4
Windows 10 Pro (64bit)
Virtual Memory set to 16GB