Radeon Vega 64 instantly crashing under high load

[sennn]

Hi!

I just upgraded to a vega 64 (sapphire 8 gb reference edition) from my 980 ti, to run mojave and overall have better performance in macOS, however I'm running into problems.
I managed to get dual monitor working with lilu and whatevergreen, and even managed to stop my fans from simulating a helicopter with vgtab, no matter what I setup in vgtab in terms of the higher p clocks, and power target (tried between 40% and 100%) as soon as I start valley or heaven my pc just shuts down. On windows i can run both of them without problem, so it's not a PSU issue as I originaly thought.

The only progress I managed to "make" was by using RadeonVegaLowFansSpeed.kext which allowed me to run geekbench without crashing, but still crashes at valley/heaven.

I was mostly experimenting with just using the vgtab kext in kexts/other, initially I tried it with SSDT, and injecting it into the config.plist, but none of them seemed to make any difference, should I continue experimenting with those too or it should work as a kext too?

I attached my current EFI (I know it has 3 aptio fixes, my board is finicky with that, I'm also experimenting on that at the moment).
Setup:
msi x99a sli plus
i7 5820k
sapphire amd radeon vega 64 8 gb
mojave 10.4.4

Anyone got any idea how can I make it run propely?

Thanks,
sen

EFI.zip

[feckn_eejit]

I have the same GPU in an EVGA X99 Classified with an i7-5930K.  I flashed the Sapphire Nitro+ RX Vega 64 secondary BIOS to the "primary slot" on my Sapphre Vega 64 reference card, and that solved the fan issue.  I had hard shutdowns under heavy GPU load until I changed PSUs from an old Corsair TX750W to a new AX860i.  To be fair, I didn't try it in Windows... but the TX750W is still working fine in another machine with a less power-hungry GPU.  This thing sure throws off heat!

[zoskia]

Remove vgtab.kext and try this one: https://www.hackintosh-forum.de/forum/thread/39923-tool-vega-64-powerplaytable-generator/

 

First use the defaults from the AJ column. (AJ -> AE)
Always use 1350 mV in cell 8:AE, never change!

Good luck
 

[Haive_Music]

I'd be interested to know if you ever resolved these issues with your card?

 

Many months ago, I attempted to switch over to a Sapphire Nitro+ RX Vega 64, and ended up experiencing this same issue under OSX. I always assumed it was a problem with the card, but perhaps it could have been resolved?

 

 

I finally gave up, returned the Vega, and reinstalled my 1080 and stuck on High Sierra.

Edited April 27, 2019 by Haive_Music