Mark_168 :
I thought I'd give this monitor a shot as my first 4k. BestBuy is having a sale today at $279., so it's about the cheapest I've seen. Even though I just bought the Nvidia GTX1080 and it doesn't take advantage of the freesync, I don't want to spend the money to get a gsync monitor. Hope it works out ok.
NVidia has a new feature called Fast Sync you may want to check out.
It's for fast-paced games where you can render over 2X the rate of your monitor. Without getting into the technical details, it's similar to normal VSYNC ON so there's no screen tear but there's slightly less LAG than normal VSYNC because it can grab a newer frame. The GPU runs unlocked, but you still only display 60FPS as you take the last, complete frame prior to the refresh cycle and display that. The higher the number of complete frames you can generate, the less lag you get.
We'll have a better idea once it's tested.
So if you like fast paced shooters you may want as low as 1920x1080 if it's a lot smoother than 1440p/4K.
I also wouldn't recommend playing many games at 4K even with a GTX1080. Playing at 2560x1440 is probably ideal for most games.
In case you didn't know you can scale by ASPECT RATIO in the monitor or in the GPU. I don't see a difference myself, but with a 4K monitor it MAY be that the GTX1080 is faster at scaling than the monitor's scaler. You can try both and see if you notice a difference.
(if you scale by aspect, and scale on GPU, it simply always outputs the monitor's native resolution such as 4K and does all the scaling on the GPU first. If you scale on the monitor it sends the output, such as 1920x1080 to the monitor and the monitor scales that up)