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budhardy

macrumors member
Original poster
Sep 19, 2017
39
103
DC
Hi, I have a

Dell S-Series 27-Inch Screen LED-Lit Gaming Monitor (S2719DGF); QHD (2560 x 1440) up to 155 Hz; 16:9; 1ms Response time; HDMI 2.0; DP 1.2; USB; FreeSync; LED; Height Adjust, Tilt, Swivel & Pivot

I go into my settings on my MacBook Pro and I only see 60hz. I pressed option on scaled and still only get 60hz. I have a usb-c adapter that connects my HDMI cable to my monitor. How can I enable the 144hz?

Thanks
 

konqerror

macrumors 68020
Dec 31, 2013
2,298
3,694
What model is the USB-C to HDMI converter? It probably isn't HDMI 2.0 compatible. You also didn't say what model or generation your Mac is.

It's probably best to go USB-C to DisplayPort, since DisplayPort is native in pretty much all USB-C ports while HDMI isn't.
 
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budhardy

macrumors member
Original poster
Sep 19, 2017
39
103
DC
What model is the USB-C to HDMI converter? It probably isn't HDMI 2.0 compatible. You also didn't say what model or generation your Mac is.

It's probably best to go USB-C to DisplayPort, since DisplayPort is native in pretty much all USB-C ports while HDMI isn't.

MacBook Pro 15-inch 2017
 
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Dhock_Holiday

macrumors regular
Sep 17, 2019
188
170
Are you running in clamshell mode? I have always had bad luck with converters, USB-C to HDMI cables are pretty cheap and will likely alleviate the problems your having.
 
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joevt

macrumors 68040
Jun 21, 2012
3,076
1,396
DisplayPort 1.2 has more bandwidth than HDMI 2.0 so it will get better results at certain resolutions. Use a USB-C to DisplayPort cable. If that doesn't work, then try SwitchResX.

What USB-C to HDMI adapter are you using? You can use the AGDCDiagnose command to discover the max DisplayPort link rate and width (should be four lanes of HBR2). There exist DisplayPort 1.2 to HDMI 2.0b adapters (for HDR) and DisplayPort 1.4 to HDMI 2.1 adapters (for 4K 120Hz).
 
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