Thanks a lot! I was missing the "setx" I tried with -di 01 (it was not a typo) and it works with both cards now!! It's strange though, I think it worked with the space in between before, at least the GPU's were recognized.
Anyway, I happy I got a working solution, not going to question the logic behind it. Thank you so much!
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As others have said, "set" does not persist across boots whereas "setx" persists across boots. I believe your error comes from not having the '='
set GPU_FORCE_64BIT_PTR=1
set GPU_MAX_HEAP_SIZE=100
set GPU_USE_SYNC_OBJECTS=1
set GPU_MAX_ALLOC_PERCENT=100
set GPU_SINGLE_ALLOC_PERCENT=100
ZecMiner64.exe