Quote from: sivanko on February 04, 2018, 10:26:41 PM

Hello all,

I have an "interesting" problem. I have four rx560 4gb GPUs, two XFX and two MSI Aero. XFX are on x16 slots on MBO, MSI on x1, on risers.
The problem is that GPU0 and GPU1 are on 12 MH/s but GPU2 and GPU3 are 5,3 MH/s.
I flashed them with BIOSes from this forum. I tested MSI on WIN10 and it goes for a 14 MH/s and XFX is max 13 MH/s.
Linux Mint, 4.10 kernel, amdgpu-pro.17.40 driver, for a blockchain.
Claymore 10.5, ETH/sia
Two PSU, 400W and 550W, MBO AM2+, quad core proc, 8 GB RAM. There's plenty hdd space, 16gb swap.

Now, the problem is that's too low hashrate on two cards, I don't have an idea how to fix it. I tries some solutions from net but no avail. Commands from claymore seems not working.
Can anyone help me with this? Would it be better if all four GPU are on risers?

I have 3 x1 on MBO and 2 x16, so I am planing for a fifth GPU but...not till I solve this problem.

Would have initially said check your page file, but it seems to match your 4x4gb @ 16gb.

I'm thinking here is some sort of BIOS limitation - can I ask what CPU you are using? It's not an APU is it?

There is some sort of bottleneck when you are running more than 2 cards - most of those boards are rated for SLI, but it really depends on the board with anything more than that.

I recommend maybe getting a cheap AM3 board with a Piledriver or maybe an FX6300, should run stable.