Both 5.2e and 5.1c sometimes detect one extra card
.....
There are 6 cards in this rig so GPU 1 and GPU 2 is the same card. Needless to say this does not end well
So far I have managed to run 5.1c over some time but not 5.2e
Windows 10
Most probably mixed-up drivers. Remove the drivers with DDU, then check if they are really removed - they should be listed only as "Microsoft Basic Display Adapter" not as Radeon .... If necessary, run DDU again until you see only "Microsoft Basic Display Adapter"s in the Device Manager, only then install the new drivers.
I suspect this problem is related to how the latest Windows 10 build(s) deals with "Microsoft Remote Display Adapter" when connecting through RDP. I've seen this problem with more then one version of the AMD driver and both in PhoenixMiner and Claymore. All is fine if I reboot the miner and do not connect to it until after mining has started. But if I start the miner after logging in with RDP it will detect 2 GPUS on PCIe 1.
This issue can probably be solved in the miner but I suppose it's not of high importance.