Have you tried win+p keyboard combination in Windows?He talked about using SwitchResX to turn off the internal display but that's just under macOS. What about under windows? I've got a 1440p/144hz display I'd like to use when I'm gaming.
This under clocked 5700 XT with 16GB of RAM outperforms its higher clocked PC counterpart in 4K gaming for what I play, and RDR2 is no walk in the park, so if that isn't the RAM compensating to the point of outperforming a 2080TI (by 2fps) as well, then I have no clue. This card is the best available and the 5700 isn't that far behind based on numbers or price, if you need it you probably know, and this VRAM is massive future proofing for this iMac hands down. Again, it outperforms the PC market equivalent and leader in performance and price. This iMac is one of the better deals in high end gaming until RDNA 2 and Ampere.
Might be but that is also my point. Buy 5700 XT for the extra 10-15% performance or 16GB VRAM if you really need it now or just have the cash. For me it's not worth the 67% price increase compared to 5700. I will be gaming in 1440p for better performance even in the future and saving my money.
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