I just tested today 4000 on first slot and 120 on third. So in theory it seems possible to have
2x 4000 + 120 on slower slot and all this in macpro.
For mee it seems great step before big array and expander if it works.
Lets say you put in new 4K card from BM.
One would have to use internal array then.
470 seems great idea but here was talk about it that this ma or may not work (red not all cores are supported).
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Margus
https://iconstudios.eu