Hello. I've got two cards, both 1070 ichill same exact model, one of them works 100% and the other works ONLY on amd platform (ryzen or older) and it does not post in any Intel platform but works completely fine in a ryzen board. I've tested it in 5 boards with different cpus, rams etc. Always works on amd but not Intel. I've also noticed that it doesn't work in amd if it was in a riser, (only works on a full 16x slot) the riser is confirmed working and I tried more than 3 risers. What could possibly cause this? Why does it work on AMD but not Intel? And why does it only work on a full 16x slot but not 1x when the other card I have works fine in all cases?

Thanks in advance <3

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Posted after 1 hour 53 minutes 2 seconds:
Forgot to mention that if it's the secondary card, device manager sees it as unknown memory controller and SM BUS.