How to increase refresh rate with external display?

[original poster]

Hi guys,

I have just bought an early 2016 MacBook and an LG 38UC99 (http://www.lg.com/us/monitors/lg-38UC99-W-ultrawide-monitor)

I have connected it via USB-C however am only getting 30Hz refresh rate, how do I increase this to 60 as I am getting lag with my mouse.

Any help would be greatly appreciated!

Kind Regards,
Chris

 

[BeatCrazy]

Are you running 10.12.1?

 

[original poster]

I am, however I have it running perfectly at 75Hz now!

 

[BeatCrazy]

I am, however I have it running perfectly at 75Hz now!

I wouldn't have expected 75Hz to be possible. What did you do to get it unstuck from 30Hz?

 

[original poster]

I followed a guide that I found on 9to5 Mac which worked perfectly!

See attached.

 

[RyanC1384]

I followed a guide that I found on 9to5 Mac which worked perfectly!

See attached.View attachment 672396View attachment 672397

Did you have to use this hack? Or was it something else over at 9 to 5?

 

[pugxiwawa]

How did you connect to the monitor? USB-C to Apple Digital AV Multiport Adapter and then HDMI 2.0? I'm having problem getting 2016 MB to run at 60hz with LG 27UD68. Any help would be greatly appreciated. Thanks.

EDIT:
Nevermind, this is the new monitor that comes with USB-C port. Time to upgrade...

 

[vipergts2207]

How did you connect to the monitor? USB-C to Apple Digital AV Multiport Adapter and then HDMI 2.0? I'm having problem getting 2016 MB to run at 60hz with LG 27UD68. Any help would be greatly appreciated. Thanks.

EDIT:
Nevermind, this is the new monitor that comes with USB-C port. Time to upgrade...

All the USB-C multiport adapters I've seen only support 4K at 30 Hz. You'll need a dedicated USB-C to HDMI adapter for 60 Hz, IF the rMB supports 4K at 60 Hz in the first place.

 

[BeatCrazy]

All the USB-C multiport adapters I've seen only support 4K at 30 Hz. You'll need a dedicated USB-C to HDMI adapter for 60 Hz, IF the rMB supports 4K at 60 Hz in the first place.

Yes, the '15/'16 MacBooks support 4K 60Hz. You either need to do it via USB-C, or use the Caldigit USB-C dock w/firmware update installed, the you can do HDMI 2.0 or DP. No hack needed on the MacBook, just Sierra.