NEW amd drivers in 10.13

[Spacedust]

Plugged a Vega 56 in, saw the 8.0 GT/s link speed in PCI section. Must be cosmetic, just like when Nvidia cards say "2.5" but are really at 5.0.

Vega seemed OK until I threw Uningine at it. At Extreme HD it had issues that didn't show up in Medium settings.

Another candicate for SATA bay power connector?

[mysticalos]

BTW, I've confirmed with MANY users now on macs with AMD hardware, the low performance bug after sleep bug is back in full force. if you use sleep. after sleep AMD gpu performs terribly in game and bencharms until you power cycle to get card out of low power state.

this bug first appeared in 10.7 on only AMD hardware and it wasn't fixed until 10.9. it came back for some users in 10.10 or 10.11 as well forget which and was again fixed.

it's back AGAIN in 10.13.

I'd be curious if rominator can do some testing with his vast array of GPUs.

This time around at least it's affecting metal, not sure if it's affecting opengl or not. in the previous version of bug it affected opengl but at the time there was no metal.. but YES it affects metal in 10.13.

[Spacedust]

Can you check PCI-Express speed after resuming from sleep?

[mysticalos]

I cannot, but I'm hoping some others can/will

I've also reached out to people who contacted apple who confirmed the bug so it might get fixed, for the third time, soonish

I have just seen the bug tanking performance on opengl/metal games on multiple forums from multiple users all using AMD hardware (real macs).

I don't know if it'd affect a hackintosh or not, probably? most hackintosh are on nvidia though.

[tomtomgps]

Looks like some people were able to enable HEVC decoding on the GPU  https://www.tonymacx86.com/threads/radeon-rx-4xx-5xx-standalone-system-amdradeonx4250-kext-gva-support-h264-does-not-support-hevc-hw.240353/