State of eGPU for Macs – Catalina 10.15 Update
My setup runs fine, both in passthrough mode (eGPU <> MacMini > Display) and direct mode (MacMini > eGPU > Display). Unigine Valley shows scores of 2500 and 3500, respectively. Yet, my Trainz game shows no difference between those two modes, presumably because in both cases Activity Monitor shows a maximum bandwidth of 5 Gb/s used 100%.
Why only 5 Gb/s? The OP also shows this 5 Gb/s value.
I've tried different TB3 cables, but no difference...
I noticed iMovie doesn’t use my egpu at all. Really lame - spend all this money and it only works on certain apps
. Vega 56 works “ok” on Catalina. I think in Mojave the egpu did more in iMovie
Mmm... I still have a Vega 56 card lying around. Are you suggesting that I could get higher bus speeds with that older card? Wouldn't be hard to test, so stay tuned.
@hkoster1 I believe @themadturtle11 was commenting on the 2018 Mac mini issue with running Catalina with a Polaris card such as RX 580. RX 5700 XT is a Navi card and RX Vega 56 is a Vega so they don't have boot hang issue in the 2018 Mac mini. Regarding the 5 Gb Max Bandwidth/sec, we don't really know how Apple determined that number. I have tested Thunderbolt 1, 2, and 3 Macs and it's the same 5 Gb/s in Activity Monitor for the eGPU.
Thanks @itsage , I'm just trying to find out why Unigine Valley improves score/fps when using the direct eGPU > Display connection, and my Trainz game does not. The game devs claim that the CPU > eGPU bus is already saturated when using the passthrough connection (eGPU <> Mac Mini > Display), but somehow that conclusion doesn't feel right.
BTW, my Display is the LG 23.7-inch 4K UltraFine, and in the direct connection I've used both the Moishi DP > USBC cable and the Huawei VR2 cable, both work well.
I am having screen freezes while using applications on the screen driven by my egpu. It happened while using Firefox and Substance Painter. Hot unplugging and replugging solves the issue for a while, till it happens again.
Anybody else experiencing this issue? (using Catalina and a Radeon VII egpu)
Stay on 10.15.1 for now. A couple members have already posted about issues with 10.15.2.
I would stay on 10.15.1 for now - I haven't seen anybody else corroborate my issue yet, but after updating to 15.2, I can no longer boot with my eGPU attached. I have to boot with HDMI connected, then plug the eGPU in at the login screen. This also means that booting into Windows is no longer straightforward, as I can't get a boot menu with the eGPU connected, either. It appears that I'll have to shut down completely, unplug the eGPU, plug in HDMI, then turn the mini on and select my boot device, then connect the eGPU.