Netkas and MacVidCards set new GPU/eGPU record ! 4 @ Titan Xp on a MBP !

[Rominator]

Count'em, 4 yes FOUR Titan-Xps all running at once.

The Otoy Octane benchmark of 769 means they scored equivalent to nearly 8 @ GTX980s. (769% of 1 @ GTX980)

I don't believe anyone has posted such a score before.

On Blender I ran same test as Barefeats did here:

http://barefeats.com/imacpro_vs_pt4.html

And the scores are not CPU bound at all. As in I can put a Titan-Xp in cMP or nMP or 2016 TB3 15" MBP and I always get 2:05. Barefeats got 127 seconds, which is of course nearly the same score.

Anyhow, with 4 Titan-Xps I got score down to 38 seconds. New iMac Pro needs more than 10x that much time. Two Titan Xps needed 65 seconds. 3 of them got it around 44.

Now the caveats, using all 4 TB3 ports means I can't have power connected, and the eGPU enclosures don't offer enough. So the MBP goes dead after awhile. And there is some jerkiness to motions on screen, especially the built in one. 13" with no dGPU is much smoother, but it only has 2 TB3 ports.

It took several boots to get all 4 to show up, frequently I only got 3. And with these cards so hard to get, I doubt I'll have 4 laying around again. 3 were on TB3 while final card used a TB2 case and Apple TB3/TB2 adapter.

Aside from the awesome numbers, I don't recall seeing 6 Total GPUs in System Profiler before.

[Spacedust]

If we can only use that power for gaming but for professional users it would be probably way cheaper and faster then upcoming Mac Pro 2019 even in max configuration ;-)

Can you run LuxMark in such config?

[Rominator]

Alas, between Apple's new love of Metal and Nvidia's busy driver team, OpenCl now only runs on one Nvidia GPU at a time.

So, running with 4 Titan-Xps in Blender, but would only have the 2 @ D300 and a single Titan Xp in Luxmark.

[Arch Stanton]

Impressive work.  So it looks like the 4GPU limit has been lifted again.  Have you ascertained the max. # of eGPUs on nMP yet?

[Rominator]

I have only been able to get 2 Nvidia going in 10.13.4.

But that includes the 2 AMD built in cards.

In Windows I have only been able to get 1 Nvidia card along with the 2 AMD built ins. I managed to get a 7970 going in Windows pretty easily last week but the Vega and 580 will require work.

I a very curious what Barefeats will find with iMac Pro. He verified that one alone worked but cool thing about our current eGPU Nvidia cards is they open the door for other cards. Looking forward to what he finds in both OS’s.

[Arch Stanton]

Thanks.  Pity they shackled nMP.