5K2K at 120Hz with Mac Mini M4

[Beau Slim]

I still stand by my assumption that HiDPI is not supported for resolutions above 3072.

My M4 Pro mini arrived yesterday, and I'm seeing 3360x1418 and 3200x1350 HiDPI modes for my LG 34WK95U using the included TB cable to connect directly or daisy-chained through my Dell monitor's TB interface. I think you said you had the "BK" version but it is my understanding that our monitors are identical but packaged differently.

Sequoia 15.2

 

[maksakal]

My M4 Pro mini arrived yesterday, and I'm seeing 3360x1418 and 3200x1350 HiDPI modes for my LG 34WK95U using the included TB cable to connect directly or daisy-chained through my Dell monitor's TB interface. I think you said you had the "BK" version but it is my understanding that our monitors are identical but packaged differently.

Sequoia 15.2

Yes, they're identical. The BK version is the business model with an extended warranty.

It's an interesting result, suggesting that the M4 Pro supports higher resolutions. However, there's still no indication of how Apple plans to address this issue or will they at all...

 

[maksakal]

what about the mouse, it keeps hanging with betterDisplay, that's irritating

Not something I've experienced so far.

I experience this frequently and it can be quite frustrating. Mirroring is not a solution in the long run.

 

[kasakka]

Here is why you want TB5 i.e. Display Port 2.1:

Yes, DisplayPort 2.1 is capable of supporting 8K at 120Hz with HDR, but it depends on the configuration and compression settings:

1. Bandwidth: DisplayPort 2.1 offers a maximum raw bandwidth of 80 Gbps with a usable bandwidth of 77.37 Gbps after overhead. This makes it capable of driving 8K120 in certain configurations.

2. Compression:

• Without compression, 8K120 (10-bit color, RGB or 4:4:4 chroma) exceeds the available bandwidth, so it would require DSC (Display Stream Compression) to fit within the bandwidth.

• With DSC, 8K120 HDR is achievable and visually lossless.

3. Cabling:

• You would need a certified Ultra-High Bit Rate (UHBR) DisplayPort cable to utilize the maximum bandwidth of DisplayPort 2.1.

4. Hardware Support:

• Both the GPU and monitor must support DisplayPort 2.1 and be capable of handling the resolution and refresh rate.

In summary, DisplayPort 2.1 can indeed push 8K120 with HDR, but compression (e.g., DSC) will typically be required for this resolution and refresh rate combination.

Believe one thing, I have an old ATI 5770 on a MacPro 2008 and 2009 that can drive 4K60 i.e. 3840 non-HiDPI and 1920 non-HiDPI

But you never know if in 2-3 years you wanna just buy like a 54" an LG or Sony 8K120 OLED or MiniLed TV!

2¢ Laters...

Except we have no idea if Apple's computers fully support it with the maximum bandwidth. The only display on the market atm that truly benefits from DP 2.1 is the Samsung G9NC superultrawide.

Yet on the M4 Pro/Max its scaling options are still severely limited, so the extra bandwidth from DP 2.1 seems to be totally useless and it still needs to be run as two displays.

By the time DP 2.1 becomes actually relevant you might as well buy a M5 or M6, so I'd go for the base Mac Mini atm.

 

[apple_lh]

It's not necessary to discuss this issue. The M1/M1Pro was able to do it right, why the M4/M4Pro shouldn't?

 

[allxmyxlovin]

FWIW, I just replaced my LG-40WP95C (was not able to do 3840x1620 in HiDPI) with the Dell U4025QW and to my pleasant surprise the option for 3840x1620 was available. I'm using an M4 Max MacBook 16 inch.

 

[klambrec]

I experience this frequently and it can be quite frustrating. Mirroring is not a solution in the long run.

Several days in now and still haven’t seen any mouse issues. I’m using a combo of a a wired Razer Deathadder and the Magic Trackpad.

 

[apple_lh]

Several days in now and still haven’t seen any mouse issues. I’m using a combo of a a wired Razer Deathadder and the Magic Trackpad.

Perhaps this is "my" problem, I'm using the Logitech MX Master 3 (without "s"), but I tried a wired mouse too with the same issues

 

[Daveyboyeee]

Perhaps this is "my" problem, I'm using the Logitech MX Master 3 (without "s"), but I tried a wired mouse too with the same issues

Happening to me too on an apple trackpad and MX Master 3

 

[anthonymoody]

FWIW, I just replaced my LG-40WP95C (was not able to do 3840x1620 in HiDPI) with the Dell U4025QW and to my pleasant surprise the option for 3840x1620 was available. I'm using an M4 Max MacBook 16 inch.

Such a crazy, silly thing. I hate little tech gremlins like this. I have an M1 Max and the LG. Not in a rush atm to upgrade to an M4, but, among the things I shouldn't have to even think about is whether or not my monitor will work as it does now.

 

[mctape]

Perhaps this is "my" problem, I'm using the Logitech MX Master 3 (without "s"), but I tried a wired mouse too with the same issues

I've had no issues so far with my Logitech M720 that I've had for like 8 years. I did just order a MX Master 3S because I've been curious if I'd like it better so we'll see how that behaves when I get it.

 

[Beau Slim]

Are you guys sure it is a mouse-related issue and not a screen stutter? If GPU use is spiked, I can see BetterDiplay occasionally missing a frame. Virtual screen HiDPI mirroring isn't lightweight.

 

[A-Sibs]

have a lg40wp95c with a m4 base MBP, 3840 x 1600 doesn't work, does anyone know if it'll work with a M4 pro chip MBP?

 

[apple_lh]

Are you guys sure it is a mouse-related issue and not a screen stutter? If GPU use is spiked, I can see BetterDiplay occasionally missing a frame. Virtual screen HiDPI mirroring isn't lightweight.

BetterDiplay is a makeshift, nothing more - at least with this issue

 

[mctape]

^^ yeah I'm just using this hack until Apple fixes the issue in the OS. I don't necessarily expect it to be perfect, though I haven't yet noticed any issues personally.

 

[rezwits]

One thing that I haven't actually seen much mention of in the forums, (haven't been reading too hard but...). I did notice the other day that the:

10-core mmM4 has 4 Performance and 6 Efficiency

where as the:

12-core mmM4 Pro has 8 Performance and 4 Efficiency!

Which in MY EYES, means it has TWICE the cores! Yeah you read it here first (perhaps)! Me being bold, but this is gonna make Xcode builds twice as fast easily. Not to mention encodes etc

So just something to think about...

Cause you would think oh 10-core versus 12-core only a couple extra cores, Nah Nah Dawg...

So even tho Apple mention Full Native Display Port 2.1 with TB5, I'll take a Pro model and cross my fingers and see if we get good stuffs with the DP 2.1!

 

[Beau Slim]

So even tho Apple mention Full Native Display Port 2.1 with TB5, I'll take a Pro model and cross my fingers and see if we get good stuffs with the DP 2.1!

maksakai and I have the same LG 5k2k and I see a couple HiDPI scaling options on an M4 Pro that he doesn't on an M4. Hopefully Apple adds more options for all models, but currently the Pro *is* different even on a DP 1.4 monitor.

 

[ClassicMartini]

Are you guys sure it is a mouse-related issue and not a screen stutter? If GPU use is spiked, I can see BetterDiplay occasionally missing a frame. Virtual screen HiDPI mirroring isn't lightweight.

I had zero - 0 - performance issues running 10,240 x 4,320 virtual screen - rez'd 'down' to HiDPI 5120x2160 a s a proof of concept, for another member here.

And I was watching activity monitor extensively, (basically flat) while running multiple chrome tabs, some youtube AND a VLC movie all at the same time.

There's quite a bit of GPU performance headroom in the M4 Pro.

My issue was things fell apart running virtual mirroring mixed in with other monitors.

I have an Mx Anywhere 3s, and yes it did 'drag' for a second every 3 to 5 minutes using Apple's built-in bluetooth. (No dongle), no matter whether there was no active rendering or the screen just sitting still.

 

[mrhansolo]

Reading through the replies, I gather that Apple is working on the issue. One thing I'm unclear on if if the M4 base will support 3840x1620 HiDPI or if its only the pro model?

I am wanting to upgrade my base M1 mini to a 14" MacBook Pro. While I can wait for a fix, I don't want to purchase the base model only to find out the fix if for those with an M4Pro. I would be pairing it with a Dell U4021QW over Thunderbolt.

 

[Lasermoon]

I run x3 32" 4k LG 32UR500 on my Mac mini M4

No issues, works really well

 

[Chancha]

I run x3 32" 4k LG 32UR500 on my Mac mini M4

No issues, works really well
View attachment 2463758

Your screen shot actually shows the "issue" that some are reporting: 3008 x 1692, 3200 x 1800 and 3360 x 1890 options are missing.

 

[Daveyboyeee]

Tried Sequoia 15.3 public beta and no dice I’m afraid.

 

[T'hain Esh Kelch]

Tried Sequoia 15.3 public beta and no dice I’m afraid.

I don't think we'll see any major changes until macOS 16, unfortunately. Latest rumors says Apple developers are having a hard time just adding the promised features for 15, let alone fixing bugs. And even with 16 I am unsure if it will happen, since they seem to be having a major backlog.

 

[plantdadsunite]

For anyone considering/holding off on an M4 Mac Mini because of the issues with the LG 40WP95C or other non-120Hz monitors, I'm happy to report that with the Mirroring functionality in BetterDisplay everything ended up working just fine at 3840x1620 and looks really crisp (on the base M4 Mini). The performance impact is basically non existent and it "just works". Do be sure to use the "virtual screen mirroring" and not the "full screen streaming" which I had enabled at first (and which is flaky).

I do hope that Apple will fix the native support for HiDPI at this resolution of course.

Do you know if this works with base M2/M3 (non-pro) Macs?

 

[roman.stapunov]

Do you know if this works with base M2/M3 (non-pro) Macs?

I used this solution with Better Display on m2 MacBook Air. It worked.