4K @ 75 Hz?

[Coconutshell]

Hey all, the Acer XB280HK g-sync monitor lists its max refresh rate at 75Hz. Is that actually possible over any current connections? Displayport? I thought the max right now was 60Hz @ 4k, is that wrong?

Thanks!

 

[Brillis Wuce]

75Hz is the vertical refresh rate, not the overall refresh rate. The monitor itself is 60Hz.

As of now, no, 4K cannot go past 60Hz, as that's the max DisplayPort can do.

 

[Coconutshell]

75Hz is the vertical refresh rate, not the overall refresh rate. The monitor itself is 60Hz.

As of now, no, 4K cannot go past 60Hz, as that's the max DisplayPort can do.

Okay, gotcha. So I guess the downside of 4K g- or free-sync is that it only has a range of like 20-30 Hz (40Hz to 60Hz ish) for the variable refresh rate?

 

[Brillis Wuce]

4K monitors are only available at 60Hz right now. The reason being is no cable can support 4K at 144Hz. DisplayPort was the first to do 60Hz, then HDMI 2.0 finally caught up.

Any monitor manufacturer could make a 4K, 144Hz monitor anytime they wanted, but a) there's no cable that could support it, and b) it would be stupid expensive.

Look at it this way...you're pretty well off if you can manage 4K at 60Hz with good settings.

 

[Glenwing]

75Hz is the vertical refresh rate, not the overall refresh rate. The monitor itself is 60Hz.

As of now, no, 4K cannot go past 60Hz, as that's the max DisplayPort can do.

Uhh what? There is no "overall refresh rate". The vertical refresh rate is what people are referring to when they talk about the "refresh rate" of a display.

Generally speaking, monitors that claim 75Hz are actually 60Hz displays that can go up to 75Hz if you lower the resolution to something really low, and that's most likely what's happening here. Same story with the NEC EA244UHD, a "75Hz" 4K display, and same story with most ASUS monitors which often list "30-75Hz" or something to that effect.