Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

madlitch

macrumors newbie
Original poster
Jun 16, 2019
6
2
I just bought a 2018 Mac Mini, and I'm running an LG Ultrafine 5k

display and an LG Ultrafine 4k display. So far the iGPU has been pretty

bad at pushing that many pixels, but I'm not 100% sure if it's due to

the speed of the iGPU itself or its lack of VRAM. I'm not running very

graphics intensive applications. Currently, I bought the 8gb of RAM

model planning on upgrading to 32gb soon, but I'm wondering if it's

worth seeing if the upgraded system ram would increase the iGPU

performance. The system is using around 1gb of swap memory now (virtual

memory on ssd when physical memory is full).
 

madlitch

macrumors newbie
Original poster
Jun 16, 2019
6
2
Yes, various people have experienced issues with hi-resolution displays and the base ram, which is resolved by upgrading memory
Great, thank you. I'll update on its performance when I install the ram.
 

oppastopa

macrumors member
May 25, 2019
68
25
how are you able to run an LG 5k and 4k? do you just plug each monitor into a TB port?
 

madlitch

macrumors newbie
Original poster
Jun 16, 2019
6
2
Don’t expect dedicated-GPU level performance, but it should help a bit.
Yeah I'm not trying to do anything super graphics intensive. The most intensive thing I would do is probably watch youtube. It's more so that the computer is actually usable with these high resolution displays.
[doublepost=1560733235][/doublepost]
how are you able to run an LG 5k and 4k? do you just plug each monitor into a TB port?
Yeah, they both ran when plugged into separate tb3 ports. The four tb3 ports are split between two buses, just like the macbooks, and each bus has up to two displayport outputs. The 5k takes two displayport connections, while the 4k just takes one. I have them on opposite connectors.
 

smirking

macrumors 68040
Aug 31, 2003
3,696
3,639
Silicon Valley
Don’t expect dedicated-GPU level performance, but it should help a bit.

Yeah. Even on a loaded 2016 MBP, I had some occasional hiccups driving an LG 5K. It was fine most of the time, but there were a few scenarios in which I'd see things get a little choppy.
 

madlitch

macrumors newbie
Original poster
Jun 16, 2019
6
2
Yeah. Even on a loaded 2016 MBP, I had some occasional hiccups driving an LG 5K. It was fine most of the time, but there were a few scenarios in which I'd see things get a little choppy.
My 2016 13" MBP with 16gb of ram was mostly fine at running the display. The mac mini with only 8gb however is struggling dearly.
 

smirking

macrumors 68040
Aug 31, 2003
3,696
3,639
Silicon Valley
My 2016 13" MBP with 16gb of ram was mostly fine at running the display. The mac mini with only 8gb however is struggling dearly.

I getcha. I didn't mean to imply that a full loaded 2016 MBP was struggling with it, but it just wasn't a total afterthought that it would run smoothly. I would notice dropped frames when I'd switch spaces sometimes. That could also have been influenced by other software too though. Where it definitely struggled was when trying to power the monitor and the MBP's screen at the same time. It worked, but wasn't too smooth.
 

oppastopa

macrumors member
May 25, 2019
68
25
when my mini 8gb arrived the lag with the Ultrafine 5k to me was minimal (I upgraded from a 2008 iMac which was on its last legs however) but I did notice it in launchpad.

upping to 32gigs and all of that went away.
pretty impressed the mini can push the 5k + 4k ultra fines. I was under the impression the mini could only support 1x5k and 1x4k but thru HDMI.

please do let us know how the system handles both ultra fines at 32gb!
 
  • Like
Reactions: Synchro3

madlitch

macrumors newbie
Original poster
Jun 16, 2019
6
2
I have now upgraded the mac mini to 32gb of ram. The upgrade has helped a lot, now the system doesn't suffer when opening firefox or switching desktops. There is still a bit of choppiness when in the launchpad or switching desktops, but it completes it at around the same speed that a dedicated gpu would. As i'm only programming on it, and the most graphics intensive thing I would do on it is watch 4k youtube videos or edit photos, it is great for what I bought it to do.
 
  • Like
Reactions: Synchro3 and ncrypt

Susurs

macrumors 68000
Jun 18, 2010
1,606
11,016
Is shared VRAM amount dependant on the RAM amount? Respectively, is 1.5GB possible with 8GB or only larger amount?
 

Stephen.R

Suspended
Nov 2, 2018
4,356
4,746
Thailand
Is shared VRAM amount dependant on the RAM amount? Respectively, is 1.5GB possible with 8GB or only larger amount?
The amount of memory for the iGPU is not fixed like in earlier models, but it seems extremely unlikely it'll assign nearly 20% of system memory to graphics.
 

Susurs

macrumors 68000
Jun 18, 2010
1,606
11,016
I wonder why it’s still @ 1.5Gb max for systems with 32GB or 64GB of RAM.
 

Susurs

macrumors 68000
Jun 18, 2010
1,606
11,016
P.S. Novabench 5/6 GPU test shows 1024MB VRAM on my MM 8GB. Anyone with 16GB or 32GB can see what this number is?
 

Attachments

  • 3D55A0B7-A201-4C2B-ADA6-0C1B73BF43F9.jpeg
    3D55A0B7-A201-4C2B-ADA6-0C1B73BF43F9.jpeg
    451.3 KB · Views: 126

Susurs

macrumors 68000
Jun 18, 2010
1,606
11,016
Thanks! Novabench is the same for all then.

I noted on activity monitor that memory usage with 8GB never go more than 6-6.5GB at max, so it means that even with 8GB 1.5 is reserved for GPU.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.