I'm wondering about this as well...was thinking about grabbing this 64TB OWC and splitting the 2019 Mac Pro right down the middle of that...but what is the most powerful GPU you can put in the Mac Pro that will run on the WINDOWS side of things??
https://eshop.macsales.com/item/OWC/SSDACL8M264M/
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I would love to see an independent review of this card. Cannot find one to this date.