So, am I right to assume that you're looking to replace your 2x 780Ti GPUs? Because if so: A. Why? Are you actually encountering performance problems? B. How do you not have enough money to get into G-sync? Also, I wouldn't expect the 390X to compete with Titan X. If they release a 395X, that might do it.

A. Maybe he sees a bigger picture with open standards, not everyone's into proprietary stuff especially when there's a choice. B. How can you assume he's loaded, maybe he has got a loan to buy what he could and anyway that's his business don't you agree? Lastly, your expectations sound like AMD have lost already but the reality is 50/50. No one knows which way it'll swing atm.

I'll just add this from the pcper article, as it is important to understand the differences between G-sync and Freesync as the real difference kicks in when FPS is below the minimum refresh rate of the monitor. http://www.pcper.com/files/review/2015-03-18/GSYNC%20vs%20FreeSync.png

I'll start by explaining FreeSync. The red dashed line represents when FreeSync is in its variable window (Ryan's 'Experience Zone'). For the BENQ panel, that zone is 40-144 Hz. Outside of that zone we shift to the orange dashed line. From observations and measurements I've taken, the BENQ panel 'sticks' at 40 Hz when game FPS levels drop <40 FPS. For that situation, the BENQ panel behaves like a fixed 40 Hz refresh rate display, and does what you would expect if V-Sync is on or off (judder or tearing). I will say that since it is refreshing at a relatively low rate, that the judder / tearing is more pronounced than it would be on a regular 60 Hz LCD. On the high end, the BENQ remains at 144 Hz when the game output is >144 FPS, also following the same V-Sync setting in the AMD driver, meaning it will either tear or judder, but at such high frame rates it is much harder to percieve either effect. Now for G-Sync. I'll start with at the high end (black dashed line). With game output >144 FPS, an ROG Swift sticks at its rated 144 Hz refresh rate and the NVIDIA driver forces V-Sync on above that rate (not user selectable at present). This does produce judder, but it is hard to perceive at such a high frame rate (it is more of an issue for 4k/60 Hz G-Sync panels). The low end is where the G-Sync module kicks in and works some magic, effectively extending the VRR range (green line) down to handling as low as 1 FPS input while remaining in a variable refresh mode. Since LCD panels have a maximum time between refreshes that can not be exceeded without risk of damage, the G-Sync module inserts additional refreshes in-between the incoming frames. On current generation hardware, this occurs adaptively and in such a way as to minimize the possibility of a rendered frame colliding with a panel redraw already in progress. It's a timing issue that must be handled carefully, as frame collisions with forced refreshes can lead to judder (as we saw with the original G-Sync Upgrade Kit - since corrected on current displays). Further, the first transition (passing through 30 FPS on the way down) results in an instantaneous change in refresh rate from 30 to 60 Hz, which on some panels results in a corresponding change in brightness that may be perceptible depending on the type of panel being used and the visual acuity of the user. It's not a perfect solution, but given current panel technology, it is the best way to keep the variable refreshes happening at rates below the panel hardware limit. Given that it is more likely for current games to dip less than 40 FPS than to exceed 144 FPS, and having witnessed both technologies first-hand, I personally find it extremely important to stay in a variable refresh mode at the low end of the LCD panel's variable range. I'll gladly take the potential slight flicker of G-Sync over the 40 Hz judder/tearing of the BENQ. The take home point from my observations is that when gaming lower than the variable range, FreeSync panels retain the disadvantages of the V-Sync on/off setting, but amplify those effects as the panel is refreshing at an even lower rate than a standard display (e.g. 60 Hz).

So, am I right to assume that you're looking to replace your 2x 780Ti GPUs? Because if so: A. Why? Are you actually encountering performance problems? B. How do you not have enough money to get into G-sync? Also, I wouldn't expect the 390X to compete with Titan X. If they release a 395X, that might do it.

From what I heard, Titan X is 36% faster than the R9 290x at 4K. http://www.techspot.com/review/977-nvidia-geforce-gtx-titan-x/page11.html and from latest leak says R9 390x is 60% faster than 290x at 4K. http://www.guru3d.com/news-story/more-radeon-r9-390x-specs-leak.html And if you put Titan X as Ref. performance. Number will go like this. 4K resolution 290X => 73.5% Titan X => 100% 390X => 117.5% 🤓

So, am I right to assume that you're looking to replace your 2x 780Ti GPUs? Because if so: A. Why? Are you actually encountering performance problems? B. How do you not have enough money to get into G-sync? Also, I wouldn't expect the 390X to compete with Titan X. If they release a 395X, that might do it.

Yes.. Because I want to support a standard and not proprietary hardware added to a monitor (g-sync) that adds a pretty high premium price tag.. My other issue with g-sync monitors is that they almost all have only one connectivity option, display port. I typically run several pc's at the same time doing various tasks.. I also play my PS4 and Xbone on my pc monitor... I cant do that with a g-sync monitor.. What I want is a 27-28" 120-144hz 1440p variable refresh rate monitor that has display port, dvi and hdmi connectivity options... And so far I haven't found that with g-sync..

Yes.. Because I want to support a standard and not proprietary hardware added to a monitor (g-sync) that adds a pretty high premium price tag.. My other issue with g-sync monitors is that they almost all have only one connectivity option, display port. I typically run several pc's at the same time doing various tasks.. I also play my PS4 and Xbone on my pc monitor... I cant do that with a g-sync monitor.. What I want is a 27-28" 120-144hz 1440p variable refresh rate monitor that has display port, dvi and hdmi connectivity options... And so far I haven't found that with g-sync..

I'm looking for a 2560x1080p 144hz 1ms monitor. Whether it's free or g sync will probably determine what my next graphics card will be.

Xb270hu I noticed that all the graphs in this article were of the XB270HU (IPS G-Sync) monitor and not the XG270HU (TN Freesync) monitor. Why is that?

I noticed that all the graphs in this article were of the XB270HU (IPS G-Sync) monitor and not the XG270HU (TN Freesync) monitor. Why is that?

Yeah that is a typo from my side, I still need to redo the charts. It should read XG270HU.

So totally waiting for a freesync display that does 20hz. I can just imagine 30fps capped games being an annoyance.

So totally waiting for a freesync display that does 20hz. I can just imagine 30fps capped games being an annoyance.

On that note, I would not even play 30fps limited games. But I agree that 40Hz min is quite low as too many games have sections where fps may drop below 40. 30Hz as minimum working refresh is target for me. Minimum upper refresh fro me is 144 and 1440p. This screen is almost perfect for me.

On that note, I would not even play 30fps limited games. But I agree that 40Hz min is quite low as too many games have sections where fps may drop below 40. 30Hz as minimum working refresh is target for me. Minimum upper refresh fro me is 144 and 1440p. This screen is almost perfect for me.

Yeah I'd rather not play 30fps limited either tbh. Now waiting for 10bit ips panel with 2xhz-120hz tho I will be fine with 75 upper limit too. I like em colors 😀

lol at the guy talking about brain cells and IQ. Get some manners to start with you spoiled bigot.

Yeah that is a typo from my side, I still need to redo the charts. It should read XG270HU.

Are you going to review the XB270HU?

Now that FreeSync/GSync have become reality, I am thinking what's their REAL advantage over 144Hz/high MHz monitors? Yes I know: Vsync thats as responsive as Vsync OFF, but how noticeable is 144Mhz tearing.. really. I know it's there...

Now that FreeSync/GSync have become reality, I am thinking what's their REAL advantage over 144Hz/high MHz monitors? Yes I know: Vsync thats as responsive as Vsync OFF, but how noticeable is 144Mhz tearing.. really. I know it's there...

Stutter occurs when FPS and refresh rate are mismatched whether VSync is on or off. VSync on pushes back frames causing the "soft sync stutter" Hilbert frequently mentions in his G-Sync / FreeSync reviews where frametimes jump between 1 / refresh rate and 2 / refresh rate. G-Sync / FreeSync solve both by giving us the fluidity of VSync on @ refresh rate now equal to FPS without the input lag associated with VSync on. The real advantage - fixed refresh rate should never have existed with sample-and-hold technology such as LCD in the first place. We understand this was because CRTs had to refresh their screen at a constant speed but now this isn't the case. The funny thing, however, is that we used to assume that only CRTs needed to constantly refresh the screen so as to avoid artifacts (phosphor decay in the case of CRT which leads to flicker if not excited in time during the next refresh). This assumption has been proven false first with the overclockable Korean monitors (changing the refresh rate caused a change of color with the 2013-(early)2014 PLS panel batch), and now with G-Sync and FreeSync. If LCD panels don't get refreshed in due time, the pixels will fade away, causing flicker. Granted, the effect would be more extreme in CRTs given that phosphor decay happens extremely fast ~1-2ms so the CRT has to keep drawing the image, but this raises the question as to whether LCD can really be called a "non-refresh" technology.

Stutter occurs when FPS and refresh rate are mismatched whether VSync is on or off.

That would depend on frame delivery and it's consistency (Vsync off) No stutter with relatively even frame delivery. This is smooth as it gets: http://abload.de/img/titan_000.bmpwiu8a.jpg This is problematic, less so on high fps: http://abload.de/img/7990.bmp60u5c.jpg

More importantly, where are the drivers?

No mention of the Ghosting issue mentioned in the PCPer review and some others? Could be a disaster for this "standard" if additional hardware is required in Freesync monitors to resolve this issue. Seems that may be the case since Nvidia states in the PCPer article:

NVIDIA claims its G-Sync module is tuned for each display to prevent ghosting by change the amount of voltage going to pixels at different refresh rates, allowing pixels to untwist and retwist at different rates.

Ghosting Concerns: http://www.pcper.com/reviews/Displays/AMD-FreeSync-First-Impressions-and-Technical-Discussion Example video comparison: https://www.youtube.com/watch?feature=player_embedded&v=-ylLnT2yKyA Edit: Someone did post on the Ghosting issue and included a jpeg. I've also added video comparison.

That would depend on frame delivery and it's consistency (Vsync off) No stutter with relatively even frame delivery. This is smooth as it gets: http://abload.de/img/titan_000.bmpwiu8a.jpg This is problematic, less so on high fps: http://abload.de/img/7990.bmp60u5c.jpg

Even if it's perfectly even frame delivery, if it's not at a perfect divisor of the refresh rate, it will stutter. Lock 45FPS at 60Hz and try it out. Then change your refresh rate to 45Hz and try 45FPS again. You're sampling an input of 45Hz at 60Hz --> stutter.

just installed catalyst 15.3, and proved that U28D590D doesn't support FreeSync... not surprised but a little disppointed

just installed catalyst 15.3, and proved that U28D590D doesn't support FreeSync... not surprised but a little disppointed

How / why would it possibly support FreeSync?