Up until now, I went with the "G-Sync monitors can't upscale" wisdom, and that only GPU upscaling works.
Well, today I decided to experiment with ToastyX's CRU
on a 1440p G-Sync monitor (an XG2703-GS) that has better-than-average upscaling when using HDMI. However, HDMI means no G-Sync.
So I added custom 1280x720 and 1920x1080 resolutions to see if I can get monitor upscaling to work over DisplayPort. And lo and behold, quality upscaling by the monitor itself is possible. It's much sharper than the default GPU upscaling (which blurs the image and also "muffles" the colors too much.) However, with 1920x1080 it only accepts 60Hz, and with 1280x720 only up to 75Hz. Anything higher will just result in a black picture with the OSD saying "0x0 0Hz". G-Sync can STILL be used even with monitor upscaling. Which is weird.
Any explanation as to what's happening here? The monitor's scaler seems to activate here. However, G-Sync still works. How's that possible?
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