I recently purchased a second RX 480 GPU from Asus and planned on running the two of them in crossfire. When I turned on my PC I got no display from anything. Since then I have been troubleshooting for nearly 3 days. I would test both cards in both pci-e slots, plug a cable into the motherboard, etc. I would occasionally get a display from the older GPU or sometimes from my onboard graphics, but even when I could successfully boot into windows with a display, the newer Asus 480 would not appear on the AMD crimson settings.
Specs are as follows:
MOBO: MSI Z170A Gaming M7
CPU: Intel i5-6600K
RAM: 16 GB HyperX Fury Black
GPU1: XFX RX 480 Blower Style
GPU2 ASUS Strix RX 480 OC edition
PSU: EVGA supernova 750w G2
Specs are as follows:
MOBO: MSI Z170A Gaming M7
CPU: Intel i5-6600K
RAM: 16 GB HyperX Fury Black
GPU1: XFX RX 480 Blower Style
GPU2 ASUS Strix RX 480 OC edition
PSU: EVGA supernova 750w G2
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