The AMD FreeSync Review
by Jarred Walton on March 19, 2015 12:00 PM ESTFreeSync vs. G-SYNC Performance
One item that piqued our interest during AMD’s presentation was a claim that there’s a performance hit with G-SYNC but none with FreeSync. NVIDIA has said as much in the past, though they also noted at the time that they were "working on eliminating the polling entirely" so things may have changed, but even so the difference was generally quite small – less than 3%, or basically not something you would notice without capturing frame rates. AMD did some testing however and presented the following two slides:
It’s probably safe to say that AMD is splitting hairs when they show a 1.5% performance drop in one specific scenario compared to a 0.2% performance gain, but we wanted to see if we could corroborate their findings. Having tested plenty of games, we already know that most games – even those with built-in benchmarks that tend to be very consistent – will have minor differences between benchmark runs. So we picked three games with deterministic benchmarks and ran with and without G-SYNC/FreeSync three times. The games we selected are Alien Isolation, The Talos Principle, and Tomb Raider. Here are the average and minimum frame rates from three runs:
Except for a glitch with testing Alien Isolation using a custom resolution, our results basically don’t show much of a difference between enabling/disabling G-SYNC/FreeSync – and that’s what we want to see. While NVIDIA showed a performance drop with Alien Isolation using G-SYNC, we weren’t able to reproduce that in our testing; in fact, we even showed a measurable 2.5% performance increase with G-SYNC and Tomb Raider. But again let’s be clear: 2.5% is not something you’ll notice in practice. FreeSync meanwhile shows results that are well within the margin of error.
What about that custom resolution problem on G-SYNC? We used the ASUS ROG Swift with the GTX 970, and we thought it might be useful to run the same resolution as the LG 34UM67 (2560x1080). Unfortunately, that didn’t work so well with Alien Isolation – the frame rates plummeted with G-SYNC enabled for some reason. Tomb Raider had a similar issue at first, but when we created additional custom resolutions with multiple refresh rates (60/85/100/120/144 Hz) the problem went away; we couldn't ever get Alien Isolation to run well with G-SYNC using our custome resolution, however. We’ve notified NVIDIA of the glitch, but note that when we tested Alien Isolation at the native WQHD setting the performance was virtually identical so this only seems to affect performance with custom resolutions and it is also game specific.
For those interested in a more detailed graph of the frame rates of the three runs (six total per game and setting, three with and three without G-SYNC/FreeSync), we’ve created a gallery of the frame rates over time. There’s so much overlap that mostly the top line is visible, but that just proves the point: there’s little difference other than the usual minor variations between benchmark runs. And in one of the games, Tomb Raider, even using the same settings shows a fair amount of variation between runs, though the average FPS is pretty consistent.
350 Comments
View All Comments
ggg000 - Thursday, March 26, 2015 - link
Freesync is a joke:https://www.youtube.com/watch?feature=player_embed...
https://www.youtube.com/watch?v=VJ-Pc0iQgfk&fe...
https://www.youtube.com/watch?v=1jqimZLUk-c&fe...
https://www.youtube.com/watch?feature=player_embed...
https://www.youtube.com/watch?v=84G9MD4ra8M&fe...
https://www.youtube.com/watch?v=aTJ_6MFOEm4&fe...
https://www.youtube.com/watch?v=HZtUttA5Q_w&fe...
ghosting like hell.
Mangolao - Friday, May 22, 2015 - link
Heard free sync still have issue..... on TFT central ; the G2G is actually at 8.5ms instead of 1ms when connected with free sync on DP.... http://www.tftcentral.co.uk/reviews/benq_xl2730z.h...cgalyon - Thursday, March 19, 2015 - link
Good review, helps clear up a lot with respect to these new features. I've long thought that achieving a sufficiently high FPS and refresh rate would take care of things, but it's not always possible to do that with how games have pushed the limits of card abilities.I'm still on the fence about whether or not I should upgrade my monitor. These days I do a lot of my gaming on my TV by running it through my AV receiver. However, there are some games (like Civilization V) that just don't translate well to a couch-based experience.
Owls - Thursday, March 19, 2015 - link
So gysync is overhyped garbage? Who would have thought?invinciblegod - Thursday, March 19, 2015 - link
Based on that statement, freesync is also garbage.LancerVI - Thursday, March 19, 2015 - link
I wouldn't say gsync was garbage. I would say gsync was DRM. Expensive DRM at that.FriendlyUser - Thursday, March 19, 2015 - link
At least it's not overhyped and costs less.fatpenguin - Thursday, March 19, 2015 - link
What's Intel's plan? Will they be supporting this in the future?duploxxx - Thursday, March 19, 2015 - link
Intel will bring another version: INTnosync, since the iGPU is not capable of running anything at decent FPS on the display res shipping today.....MikeMurphy - Thursday, March 19, 2015 - link
Which is precisely why Intel will benefit most from adaptive sync.