RUN 2WAY SLI CONFIGURATION WITH INTEL NUC6i7KYK  

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Koohyaar
(@koohyaar)
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July 5, 2017 7:55 am  

Hi

I'm going to add an egpu to my Intel nuc and I'm wondering if I can add two and run them in SLI setup. is it possible? it would be great if you guys can help me and guide me with this matter.

thanks

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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Sky11
(@sky11)
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July 5, 2017 10:35 am  

NUC has only one TBT3 port... how are you planning to connect two eGPUs?

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Koohyaar
(@koohyaar)
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July 5, 2017 7:58 pm  

what if I daisy chained the egpus and then connect them to the nuc? 

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Flint Ironstag
(@flint-ironstag)
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July 6, 2017 3:14 am  

You might be able to daisy chain them.  Somebody has to be first to try it, this stuff is still in the early stages.  No go on SLI - the motherboard or backplane needs to support it.  Could somebody come up with a hack?  I don't know.

MP 6,1 | 4c | d700
MP 6,1 | 6c | d500


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mcarver316
(@mcarver316)
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July 6, 2017 12:27 pm  

Flint is right. I've already tried 2-way SLI with the Cubix- I have successfully connected 4 external GPUs without incurring the dreaded error code 12, but no SLI support.

Daisy chain via Aki node + Aki Thunder 3 PCIE = yes on two external GPUs working, but no SLI.

Also, you will need an unlocked BIOS if you want to pair 2 Pascals or 2 Maxwells. Only 1 Pascal and 1 Kepler will work simultaneously if you have a locked BIOS.

I am including this information to save every body time and money. There is no SLI via Thunderbolt- whether with locked or unlocked BIOS.

It may take another year before NVIDIA realizes how much of a cash cow eGPUs are and release SLI enabled drivers through Thunderbolt. Hopefully, AMD also realizes this might be the competitive edge they need against NVIDIA. Or everybody is waiting for Intel to release the CPU they promised with Thunderbolt baked in.

Too bad there is no third player that specializes in graphics cards optimized for eGPUs.

2015 17" MSI GT73VR-6RF 2xGTX1070 + [email protected] (AKiTiO Node driving Cubix Chassis) + Win10 > 365Gigahashes per second


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Sky11
(@sky11)
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July 6, 2017 6:58 pm  

Guys, I cannot comment on NVIDIA, but regarding CrossFire over Thunderbolt3 - it ain't gonna work. And there are few reasons for that:

- bandwidth: CrossFire requires 16xPCIe, minimum 8xPCIe to work properly. It will not work properly over 4 lanes - assuming that each GPU actually gets 4 lanes. Other than MacBook, there are no laptops with dual Alpine Ridge chips. What you see as dual Thunderbolt ports, are actually 2 ports wired to the same chip. So when you connect two eGPUs, you actually share 4 lanes with 2 GPUs. It will work for some workloads, but not for many

- Thunderbolt latencies will kill any potential gains

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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mcarver316
(@mcarver316)
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July 6, 2017 7:22 pm  
Posted by: Sky11

Guys, I cannot comment on NVIDIA, but regarding CrossFire over Thunderbolt3 - it ain't gonna work. And there are few reasons for that:

- bandwidth: CrossFire requires 16xPCIe, minimum 8xPCIe to work properly. It will not work properly over 4 lanes - assuming that each GPU actually gets 4 lanes. Other than MacBook, there are no laptops with dual Alpine Ridge chips. What you see as dual Thunderbolt ports, are actually 2 ports wired to the same chip. So when you connect two eGPUs, you actually share 4 lanes with 2 GPUs. It will work for some workloads, but not for many

- Thunderbolt latencies will kill any potential gains

Everybody should just save their money until Thunderbolt 4 or Thunderbolt enabled CPU becomes reality. If Intel and the OEMs are intent in milking Thunderbolt 3, expect dual chip/controller Thunderbolt 3 before any significant revision to follow- I would like to be proven wrong with this prediction.

We are looking at least 2 years for major breakthrough, as far as Thunderbolt matching speed of the aging PCIE technology.

2015 17" MSI GT73VR-6RF 2xGTX1070 + [email protected] (AKiTiO Node driving Cubix Chassis) + Win10 > 365Gigahashes per second


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