High refresh rate w/ eGPU & 2019 13" MBP

ws07

macrumors member
Original poster
Jul 26, 2011
38
5
Hi - I'm struggling to get high refresh rates running on my 2019 MacBook Pro 13" (loaded config although I doubt that matters?). Running Catalina 10.15.3

- I am running a Vega 64 w/ 8GB of HBM memory in a Razer Core X enclosure w/ a fully specced Thunderbolt 3 cable to the MBP
- (2) ASUS 27" PG27U 4K / 144Hz displays via DisplayPort cables directly to the Vega 64

Both displays are running at 3840 x 2160 but only at 60 Hz. I have tried borking around in the System Preferences and with the QuickRes utility to try to see if I can override somehow.

I feel like I'm missing something obvious... I knew that the internal iGPU would only support 4K @ 60 Hz but believed that for productivity/desktop use the Vega 64 should have been quite happy w/ 4K @ 120 Hz over DisplayPort directly?

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mmomega

macrumors 68040
Dec 30, 2009
3,554
1,723
DFW, TX
On my wife's Mac mini and eGPU, Vega64, on the Samsung 5K2K 48" monitor it will go to 120Hz.

Now getting that directly within macOS was more of a struggle.
I remember having to play with a 3rd party app called SwitchResX that allow you to choose resolutions and refresh rates that for whatever reason macOS won't always show are available.
And playing around in the monitor menu system.

But I would check SwitchResX.

Then once you believe it is at 100-144, you can go test it at https://www.testufo.com/refreshrate
 

ws07

macrumors member
Original poster
Jul 26, 2011
38
5
Thank you! This did the trick - I uninstalled QuickRes which didn't seem to support refresh rate setting and installed SwitchResX.

The test website you referenced validated that the setting up to 120 Hz did the trick.

How bizarre that MacOS doesn't do this automagically, or support changing it manually anywhere that I could find.
 
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mmomega

macrumors 68040
Dec 30, 2009
3,554
1,723
DFW, TX
Thank you! This did the trick - I uninstalled QuickRes which didn't seem to support refresh rate setting and installed SwitchResX.

The test website you referenced validated that the setting up to 120 Hz did the trick.

How bizarre that MacOS doesn't do this automagically, or support changing it manually anywhere that I could find.
Yeah this was the first over 100Hz panel I've bought and I do remember 1-2 builds showed refresh rate in settings and then it went away and some point and I never saw it again and had to go to SwitchResX.

Happy this helped out.
 
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