OTOY Forums

philliplakis wrote:

mustardseedsg wrote:Glad to contribute in any little way.

What I would really like to clarify is the info I've read elsewhere that Yosemite and above can only recognise 2 graphic cards. My Thunderbolt chassis has the space and power for 4 full sized cards, but I've been holding off on adding more due to this issue that I've read.

Anyone able to verify this?

That applies to all except the nMP, I could not get more than 2 eGPU on my rMBP or a friends iMac, but on the Pro i got 4 with the exact same set up.

It may have to do with the way they map the PCIe lanes to the thunderbolt port as the nMP has 6 ports and a 40 lane cpu, others have a 16 lane and 2 ports there may not be enough resources to enable more than 2.

Can you let me know which chassis you are using that can hold 4 GPUs and connect to a nMP? Also did you get the 4 gpu to work with nMP with El Capitan?

Can you let me know which chassis you are using that can hold 4 GPUs and connect to a nMP? Also did you get the 4 gpu to work with nMP with El Capitan?

Sorry to dig up this old thread - but I'd be interested as well to know what you used to run 4 cards on a nMP and El Capitan. I tried the Amfeltec 4 way splitter http://amfeltec.com/products/flexible-x ... -oriented/ in my Akito TB case, and while 2 cards work perfectly, numbers 3 and 4 either make the startup hang, or don't show up at all (I can see 4 generic NVIDIA card entries in Graphics/Displays, but Octane bench doesn't recognize any of them) . 3 of the 4 cards are exactly the same, so it isn't a mismatch issue.
Has anyone gotten either this to work, or some other way to get 4 cards to work through TB?