Titan-X in Netstor GPU-expander not detected

[Mike Most]

Is there anything else in the expander? And do you happen to have a Red Rocket X card in this system?

[Roman Stricker]

Nope, nothing else, just those two Titan-X and I don’t have a RED Rocket…

[Mike Most]

Have to ask this: Are you running full Resolve (i.e., with a dongle) or Resolve Lite?

[Roman Stricker]

Full version, 11.3.1
But I guess the problem starts already on the OS-level. As I wrote: in the system profiler only one Titan is detected correctly. The other one is just described as “display” and it says that “no kext is loaded”.

But I should add this: I removed one of the Titans today to replace it with the ATI RADEON 5770 that originally came with the MacPro. That one was in deed correctly identified by the system profiler… (It didn’t appear in Resolve’s preferences though but I am not sure if it meet’s the criteria to be recognized by Resolve as a GPU in the first place.

[Mike Most]

You might want to try replacing the GUI card with the ATI and see if that enables the system to see both Titans. And make sure you don’t have “use display GPU for compute” enabled in Preferences/Video IO and GPU..

[Roman Stricker]

I’ll try this though I’d bet 10 bucks this won’t make a difference. Using GUI for GPU is already turned off. I’ll get back with the result…

[Brian De herrera-schnering]

Just a guess, but I assume you’re on Yosemite? And doesn’t Yosemite have a 2 GPU limit?

[Roman Stricker]

2 external GPU and one internal GUI-card – so I am save here.
But yes, this is a system running on Yosemite 10.10.3

[Joseph Owens]

[Brian De Herrera-Schnering] “And doesn’t Yosemite have a 2 GPU limit?”

It has a 2 nVIDIA GPU limit, otherwise more AMD/ATI GPUs are supported. I have a twin Titan Black GPU array running in a Cubix Xpander with an ATI5770 running as UI in the mainframe. Very important that all drivers and CUDA versions are up to date. At the moment I am refraining from doing any updates whatsoever to my Yosemite system as it appears that Apple is trying to break the use of nVidia hardware — and getting very tired of waiting 24-36-48 hours for the latest fix to the fix to the fix to something that should never have been broken.

jPo

“I always pass on free advice — its never of any use to me” Oscar Wilde.

[Roman Stricker]

Thanks Joseph! If that should be the case, the solution would be easy. Now I’m really eager to test that as soon as I get back to the office. Nevertheless I wonder about Resolve’s config guide: Quadro K5000 is recommended for GUI and several other cards from NVIDIA for GPU (of course not the Titan-X, I’m aware that this is uncharted territory). So that would make three NVIDIAs in total here as well. Hmmm…
This goes or Mavericks, but I guess it should be the same for Yosemite since the big step of limiting external GPUs to only three happened with the evolution from OSX 10.8 to 10.9

I just remember I once had three Quadro K5000 for Mac in my system and this went without any problem (don’t remember if this was under 10.8 or 10.9 though). The problems started with trying the GeForce series. Actually I have tried before with a pair of Titan Blacks and GTX 980s of which none, not even a single one would be recognized at all. So to this extend the one Titan-X running now is already a little success ; ) Nevertheless one wants the whole thing!