Unlike "Freesync", G-Sync doesn't actually have a minimum refresh rate, it does the trickery of using double or triple or higher of the refresh rate when it goes too low.
Freesync now does the same basic thing at the GPU end if the monitor has sufficient adaptive sync range. The maximum Freesync refresh rate must be at least 2.5x the minimum rate for it to work. This does definitely restrict the number of monitors it works with, but the feature is there.
At this point a top-end Freesync implementation is as good as G-Sync as far as I'm aware, but Freesync allows much simpler and crappier implementations as well.
afaik Freesync still doesn't do dynamic frame rate overdrive (As in adapting overdrive parameters to every single transition type between frame rates).
Which happens to be another feature that requires the G-Sync FPGA with lookaside DRAM cache.
And there's no way that AMD's "Low Framerate Compensation" doesn't have a latency/synchronization penalty, as you are limited to the transfer rate of the cable/protocol, and thus have to either speculatively send the "compensation" frame at a speculative frame time, and thus risk missing the frame window of the next frame, or you have to wait a frame, and ad a 1 frame latency to the whole thing. While G-Sync only has to send a couple bits of data to indicate that the frame hasn't changed yet if the frame rate is under the panel physical limits, which is essentially instantaneous.
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ant6n - Thursday, January 26, 2017 - link
What's the minimum refresh rate? Does the G-Sync work will with games running, in fps ranges of 20-60fps.Communism - Friday, January 27, 2017 - link
Unlike "Freesync", G-Sync doesn't actually have a minimum refresh rate, it does the trickery of using double or triple or higher of the refresh rate when it goes too low.Communism - Friday, January 27, 2017 - link
It's one of the many things that having the onboard DRAM for it's FGPA allows it to do that "Freesync" cannot.Communism - Friday, January 27, 2017 - link
FPGA*, Curse you lack of edit ability.wolrah - Friday, January 27, 2017 - link
Freesync now does the same basic thing at the GPU end if the monitor has sufficient adaptive sync range. The maximum Freesync refresh rate must be at least 2.5x the minimum rate for it to work. This does definitely restrict the number of monitors it works with, but the feature is there.http://www.amd.com/Documents/freesync-lfc.pdf
At this point a top-end Freesync implementation is as good as G-Sync as far as I'm aware, but Freesync allows much simpler and crappier implementations as well.
Communism - Saturday, January 28, 2017 - link
afaik Freesync still doesn't do dynamic frame rate overdrive (As in adapting overdrive parameters to every single transition type between frame rates).Which happens to be another feature that requires the G-Sync FPGA with lookaside DRAM cache.
Communism - Saturday, January 28, 2017 - link
And there's no way that AMD's "Low Framerate Compensation" doesn't have a latency/synchronization penalty, as you are limited to the transfer rate of the cable/protocol, and thus have to either speculatively send the "compensation" frame at a speculative frame time, and thus risk missing the frame window of the next frame, or you have to wait a frame, and ad a 1 frame latency to the whole thing. While G-Sync only has to send a couple bits of data to indicate that the frame hasn't changed yet if the frame rate is under the panel physical limits, which is essentially instantaneous.