[Roman Stricker]

You’re right Marc, I will. Thanks!

[Roman Stricker]

Thanks Michael, for that speedy reply!
Yes to all points:
Iit did work before on Vs 14, 12, 11, etc…
I think I was already on the latest Beta before, but just to make sure I uninstalled und installed the latest version – problem remains…
Yes, it is the studio version.
Hmmm….

[Roman Stricker]

Still I didn’t make my peace with the situation as it is. I was following up the thought of beefing up my AMD GUI card to use its bigger processing power also for computing in Resolve. But reading other threads made me believe that this is not possible since Resolve will not accept a brand mix for computing. Anyone any experiences with that?

[Roman Stricker]

I just tried the same thing: Pulled out the ATI again and put back in the K5000. Since the temporary presence of the ATI in your system, Mike, seems to have triggered something, I was hoping for some extra power from the K5000 for my system as well. But no, i wouldn’t work. Again only one Titan-X is beeing detected while the other one shows up as “display” in the system settings and one can see that it doesn’t contribute any GPU power to Resolve.
Now I wonder: There are two system here in this forum running on at least two Nvidia GTX-something and a Quadro K4000 for Mac and there is my system refusing to run on two GTX Titan-X and a Quadro K5000 for Mac. All of us are on a 12 core Mac 5.1 with Yosemite. Now where the heck is the difference between our systems that lets you guys succeed and me not?!?

[Roman Stricker]

Thanks, Mike! But if you were able to replace your ATI GUI card with a GT 120 it is obviously sometimes possible to get a set-up with three Nvidias working – but then again sometimes not. Would be great to know for which Nvidia cards this is true…
But I am not a Nvidia fanatic so I actaully don’t care if there is an ATI or Nvidia card responsible for displaying my GUI – or should I? But what I do care about is getting the most out of my system. I could measure that with the Quadro K5000 installed for GUI and the “use display GPU for compute”-option activated it would give me an additional power of about one third of a single Titan-X. Now with the ATI Radeon HD7550 in place I don’t get any extra power from that card at all. It doesn’t effect the playback speed wether the “use display GPU for compute”-option is activated or not. Does anyone have a recommendation which card to use (not going above the 1.000 Euro line)?

[Roman Stricker]

Hi Sasha, that screenshot of yours is interesting. Because one of your GTX is also recognized as “Display”. When you click on „Display“, doesn’t it say “no kext loaded”? This it what I had been seeing here, when one of my Titan-X wasn’t recognized. I mean, are you really sure, you are using the power of all three GTX? Does realtime-playback in Resolve get any slower, when you remove one GTX from the cubix?

Anyways, I had a pleasant surprise this morning: changing the K5000 to the ATI made both of my Titan-X now show up in the system profiler. And in Resolve I can see that it’s really doing it’s work. The realtime playback speed on my RED reference clip with tons of nodes and mattes would increase from 7,5 to 15fps. So it’s really there!

Coming back to Joes latest post, I think we have two issues here – as far as I understand the matter:

A) Apple decreased the number of externaly usable GPU with the introduction of Mavericks down to just two, no matter what manufacturer the cards come from. (again waiting for Sascha to proof me wrong on this point)

B) Nvidia cards that are not MAC-specific like the GTX series do have some sort of problem. Though both of us are on a Mac 5.1 with Yosemite Sascha’s system recognizes at least two if not three external GTX plus a GUI card from Nvidia whereas my system would only let my use the two Titan-X with an ATI in place for GUI. Of course I also put in my newly unemployed Quadro K5000 into the Netstor expander. Result: The Mac wouldn’t boot, the screen remained black…

[Roman Stricker]

Be sure that’s the first thing I’ll check tomorrow morning!
Still: It’s confusing that Sascha has a working 3-nvidia-card-setup. Somehow this whole topic seem to contain some inconsistency…

[Roman Stricker]

And how did installing those GTX work for you, Sascha? Was it more or less plug & play or did you do anything special as to drivers and so? Do you have any idea what my system profiler’s message of “no kext loaded” points to?
THANX!

[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!

[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