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Adding 4th GPU drops hashrate of GPU0 to 4 MH/s
Setup:
4x Sapphire Nitro+ RX 570 4GB
ASUS P5Q Pro Motherboard
Windows 7 64-Bit
Issue:
Every time I add the 4th GPU my hashrates drop from 24 to 4 MH/s on GPU0, regardless of which PCI-E slot I add it to. I've tried everything from swapping slots, risers, and ensuring my BIOS drivers are up to date (mind you it's an old mobo; 2009).
3 GPU's run fine. With the 4th GPU in, 3/4 run normal but GPU0 always dogs to 4 Mh/s. Any idea what's going on here?
4x Sapphire Nitro+ RX 570 4GB
ASUS P5Q Pro Motherboard
Windows 7 64-Bit
Issue:
Every time I add the 4th GPU my hashrates drop from 24 to 4 MH/s on GPU0, regardless of which PCI-E slot I add it to. I've tried everything from swapping slots, risers, and ensuring my BIOS drivers are up to date (mind you it's an old mobo; 2009).
3 GPU's run fine. With the 4th GPU in, 3/4 run normal but GPU0 always dogs to 4 Mh/s. Any idea what's going on here?
Comments
I have 6 cards all on usb powered risers.
All I did was connect my HDMI cable from the monitor to the card that's connected to the PCIe-x16 slot, which was GPU1 in my rig (or 2nd slot from the left). Restart rig and voila it worked. You have to always keep that HDMI cable connected, with or without monitor. Hope that helps.