Monitor works fine on HD resolution but has low refresh rate on UHD

[manu354]

Hi,

I just bought a UHD monitor 3840 x 2160.http://www.harveynorman.com.au/computers-tablets/computers/monitors/samsung-24-ultra-hd-led-lcd-monitor.html

I have a MSI laptop with a gtx 970M

The first thing I noticed that the mouse was "slower" (It wasn't exactly slower kind of hard to describe) on the monitor than on my laptop screen, I thought this was just the low refresh rate (30hz) of the new monitor, however when I changed the resolution settings to only HD the FPS looked fine, mouse moved much more smoothly and videos played with supposedly higher fps.

Anyone know whats wrong?

Thanks!

 

[BrandonYoung]

Make sure your laptop can output either hdmi 2.0+ or displayport, if you want 4k @ 60hz.

 

[manu354]

Make sure your laptop can output either hdmi 2.0+ or displayport, if you want 4k @ 60hz.

GS60 2QE GHOST PRO 4K is the laptop, i'm pretty sure it can do HDMI 2.0, but I cant find any confirmation online.

 

[Solandri]

GS60 2QE GHOST PRO 4K is the laptop, i'm pretty sure it can do HDMI 2.0, but I cant find any confirmation online.

Haswell/Broadwell only supports HDMI 1.4. It will only do 4k @ 24 Hz.

The nvidia GM204 core (965m, 970m, 980m, GTX 970, GTX 980) supports HDMI 2.0. But in the vast majority of Optimus laptops, it's used as a co-processor, and does not drive the HDMI out connection. There are a handful of Optimus laptops rigged so the nvidia GPU does drive the HDMI port. And a couple which have a BIOS option to disable the Intel GPU and use the only nvidia GPU.

If your laptop supports either of these options, then it should be able to do 4k @ 60 Hz. But the fact that it's only getting 4k @ 24 Hz means in all likelihood the Intel GPU is driving the HDMI port. You'll have to check your BIOS options to see if there's a way to turn the Intel GPU off.

Edit: That laptop has mini-displayport output. You should be using that to drive your 4k monitor. It supposed displayport 1.2, which can do 4k @ 60 Hz.

 

[manu354]

GS60 2QE GHOST PRO 4K is the laptop, i'm pretty sure it can do HDMI 2.0, but I cant find any confirmation online.

Haswell/Broadwell only supports HDMI 1.4. It will only do 4k @ 24 Hz.

The nvidia GM204 core (965m, 970m, 980m, GTX 970, GTX 980) supports HDMI 2.0. But in the vast majority of Optimus laptops, it's used as a co-processor, and does not drive the HDMI out connection. There are a handful of Optimus laptops rigged so the nvidia GPU does drive the HDMI port. And a couple which have a BIOS option to disable the Intel GPU and use the only nvidia GPU.

If your laptop supports either of these options, then it should be able to do 4k @ 60 Hz. But the fact that it's only getting 4k @ 24 Hz means in all likelihood the Intel GPU is driving the HDMI port. You'll have to check your BIOS options to see if there's a way to turn the Intel GPU off.

Edit: That laptop has mini-displayport output. You should be using that to drive your 4k monitor. It supposed displayport 1.2, which can do 4k @ 60 Hz.

Okay thank you! The monitor has only display port, not mini dp. Will a converter from mini to full display port work? Or will a mini dp to hdmi converter be able to use 30hz?

 

[chenw]

There should be DP cables that's full size DP on one end and a Mini DP on the other (the DP cable that came with my BL3201PT is like that), so no need for converters.

 

[manu354]

There should be DP cables that's full size DP on one end and a Mini DP on the other (the DP cable that came with my BL3201PT is like that), so no need for converters.

Mine are both full DP