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Old 10 May 2016, 19:22   #25
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 20,635
Ok, I now have Acer Predator X34 (3440x1440 100Hz G-Sync. No ULMB/Lightboost but also no more annoying and stupid NVidia Surround issues and 100Hz is just enough for PAL emulation with black frame insertion)

Without black frame insertion G-Sync seems to work very nicely. With black frame insertion it has odd random flicker/"out of sync" updates. Not sure why yet..

G-Sync (or FreeSync, I guess) really is perfect for emulators. Very low input lag, no tearing, no doubled or missed frames.

Only remaining problem is LCD "sample and hold" blur/ghosting that is too visible in low refresh rates (50Hz/60Hz) but perhaps it will be solved with some future G-Sync/FreeSync + ULMB/Lightboost combo mode. Hopefully.. (Black frame insertion does partially solve it but there is too much flicker..)

EDIT: flickering/blank frame was caused by too high refresh rate, it seems display keeps showing same frame if rate exceeds 100Hz even by tiny amount (I need to tweak timing a bit to fix it). Forcing 49Hz (Using display panel FPS Adj) fixed it 100%. Perfect smooth black frame insertion! Yes, even FPS Adj. works perfectly with Variable sync mode, can have vsync like mode with any refresh rate that monitor supports (30Hz to max).

Last edited by Toni Wilen; 10 May 2016 at 20:16.
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