I recently assembled a new mining rig using the ASUS PRIME Z270A motherboard as a foundation. My original intention was to configure 4x EVGA GeForce GTX 1080 Ti SC BLACK Gaming edition GPUs using EWBF CUDA MINER.
After successful setup setup with one GPU connected via a Version 006 powered USB riser (6 pin PSU -> Molex), I began adding one card at a time. Up to 3, I had no issues. Upon adding the 4th GPU, the white VGA LED on the motherboard locked in, and the computer would not post. I attempted using multiple riser cards, USB cables, PCIE slots, and even connecting the 4th card directly to the mobo via PCIE 16x slot (third one down from the CPU). Same condition every time, and clearance of the issue each time the 4th card was removed.
In looking through my device manager listings for graphics adapters, 4 are shown: 3x 1080 Ti and an Intel listing (onboard graphics). It is the latter (onboard graphics) that is currently feeding my display.
I realize that was a long, wandering post, so I’ll get to my question: O was wondering if anyone had any similar experiences, and if so, what the culprit was. Obviously, I haven’t ruled out that the card itself might just be defective, but I was wondering, too, if there might be a BIOS change I need to make in order to support the 4th card (e.g., disabling onboard graphics).
FWIW, ASUS tech support basically told me that the board isn’t designed to handle more than 3, but the forums seem to indicate numerous people have found ways around this.
Thanks, in advance, for any suggestions/assistance.