This is happening to me too. I have the Vega Pro II though but same drivers. This is a driver level issue. Apple needs to update the boot camp drivers to include the newest AMD drivers as the newest AMD drivers fixed this Particular issue. Everyone with an AMD card had this issue until AMD released new drivers to fix it and Apple hasn’t implemented the new drivers into boot camp drivers yet.
As a workaround, you can use the “unofficial boot camp drivers“ and that’ll fix the issue since those drivers use the newer drivers from AMD. Be forewarned though, with those unofficial drivers, I experienced random lockup’s requiring hard reset so I went back to the official drivers and am waiting patiently for Apple to update the drivers.
So essentially, your Mac Pro is fine.
EDIT: Also, only COD MW is affected, all other games (That I play) are fine.
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Can't you just use Windows AMD driver? That's what I've been using the whole time in my 5,1 using Nvidia cards.
Oh just saw the other post, looks like AMD doesn't detect W5700X yet? bummer. Might have to just slide in my GTX1080 until then.
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Would the Vega Pro II "Duo" be even better than the non Duo for gaming in bootcamp?
I was looking for the same answer but looks like there isn't that many that uses dual GPU.
Crossfire Game Compatibility List
Grand list of games with their known degree of Crossfire support. Engine: Name of the game's engine if known. Write proprietary if the developer has stated it is an in-house engine but didn't give it a name.
amdcrossfire.fandom.com