UPDATE: This is old information, posted before G-SYNC was released. Blur Busters now has a G-SYNC monitor (see Our Preview of G-SYNC) with ULMB. 85Hz strobing is confirmed, however, 144Hz strobing is not available.
Good news for people who want “LightBoost” style strobing at other refresh rates, to reduce GPU requirements (85fps @ 85Hz) or to reduce input lag (144fps @ 144Hz) during low-persistence mode!
The web has revealed several clues about G-SYNC’s optional fixed-rate strobe mode:
(A) The G-SYNC upgrade datasheet has 85Hz added.
(B) AndyBNV suggested on NeoGAF the low-persistence mode is superior to LightBoost.
(C) The YouTube video of John Carmack at G-SYNC launch, was very suggestive.
(D) Many articles mentions 85Hz as a CRT frequency that stops flickering for many people.
(E) The pcper.com livestream suggests a very high fixed refresh in low-persistence mode.
Upon analysis, both 85Hz and 144Hz are available strobed modes with G-SYNC, in addition to existing common 100Hz and 120Hz strobed modes, like today’s LightBoost. More strobed modes (e.g. 60Hz) might be available. You heard it here first at Blur Busters.