I recently got a second RX460 for cheap. Now I want to use it with my existing RX460 (the cards are identical) on 10.12.4 in a dual GPU setup. The single RX460 (Lilu, WhateverGreen) runs just fine, but as soon as plug in the second one in the x8 lane slot the system boots to a black screen. I can ssh into that machine, so it's running except the black screen. I also own a 750 GTX (Webdrivers, Lilu, Nvidiagraphicsfixup) which runs very well on the x8 slot, so it must be related to the second RX460. I even flashed the second RX460 to a RX560 and after that the black screen was gone but the card wasn't properly recognized.
$ system_profiler | grep -A35 Graphics/Displays Graphics/Displays: Radeon Pro 460: Chipset Model: Radeon Pro 460 Type: GPU Bus: PCIe PCIe Lane Width: x8 VRAM (Total): 4096 MB Vendor: ATI (0x1002) Device ID: 0x67ef Revision ID: 0x00cf EFI Driver Version: WEAR-104-2017-08-27 Metal: Supported Displays: Hardware: Hardware Overview: Model Name: iMac Model Identifier: iMac17,1 Processor Name: Intel Core i5 Processor Speed: 3,50 GHz Number of Processors: 1 Total Number of Cores: 2
What could be the reason? How do I get the two cards to work?
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