2018 Gigabyte Z390 Designare (GTX1080TIx2) [9th,8C,K] + GTX 1070 @ 32Gbps-TB3 (Sonnet Breakaway 350) + Win10 [philw]
Home Build Gigabyte Z390 Designare (w TB3), Core i9-9900K, 64GB, 2x GTX 1080TI, Win 10
Sonnet eGFX, GTX 1070
It just worked 🙂
Octane Bench 558
Awesome Redshift & C4D rendering...
@philw Nice build! Do you know if the Thunderbolt 3 controller connects to the CPU or PCH on this board?
@itsage Unsure, sorry! And posting about my success obviously jinxed it. Was happily running all 3 GPUs, with 4 SATA SSDs and all network interfaces enabled... and now the 1070 has the dreaded Error 12. Can't get it back even with disabling a load of those resources.
So damn random! And to confuse even more, I switched the 1070 for an AMD RX580 and that worked fine....
I wish it would be either consistently great or consistently crap 🙂
The review at www.tweaktown.com says the Thunderbolt controller only uses two PCIe 3.0 lanes. That is either wrong or bad (should be 4 lanes).
The review says there's a HD3SS215 6.0 Gbps HDMI DisplayPort 2:1/1:2 Differential Switch to switch between the DisplayPort input and the iGPU. This is bad because the switch can't handle DisplayPort 1.4 (the review implies it can - probably wrong). To support DisplayPort 1.4, it would need to use a HD3SS214 8.1 Gbps DisplayPort 1.4 2:1/1:2 Differential Switch. Or maybe the switch is used for some other purpose. Maybe the review listed the wrong switch. Maybe Gigabyte overclocked the switch.
There's only one DisplayPort input, so 5K dual link SST DisplayPort 1.2 Thunderbolt displays can only be handled by the iGPU. DisplayPort 1.4 displays probably can't work because of the HD3SS215 switch.
@joevt3 This photo of the motherboard shows one Titan Ridge [JHL7540] Thunderbolt 3 controller and two TI83 USB-C controllers so no chance the connection is x2 PCIe 3.0. @philw Can you run HWiNFO64 and expand the Thunderbolt 3 connection through the PCI Express root? Here are a couple of example what they look like; left is CPU attachment and right is PCH attachment.
Regarding error 12 can you tell us your procedure of connecting the GTX 1070 eGPU? Have you made changes in the BIOS under Peripherals > Thunderbolt? On my X99 Designare, I had Thunderbolt Boot Support [ENABLED] at eGPU connected at boot to be able to use it. Hot-plug doesn't work on this board for me.
I enabled the Thunderbolt Boot option... and restarted and no change. I then did a proper power cycle on the eGFX box and this time it has booted up and is working (but I've been here before!)... so I grabbed the GPU-Z while I could.... Thanks!
Glad to hear it's working again without error 12. However there's something not right with your Thunderbolt 3 connection on this board. The Host-to-Device should be closer to 22XX while Device-to-Host should be closer to 27XX (full Thunderbolt 3 bandwidth). There are some strange things going on with TB3 support on desktop motherboards. I had a similar experience recently on my X99 TB3 build in that the Thunderbolt 3 connection dropped to half speed. Can you click on the PCI Express root port that hosts the eGPU and check for Current Link Width? It should be 4x but the numbers in CUDA-Z indicate it's at 2x or less.
I think that will be because I had stepped it down to Gen 1 in the BIOS as part of the troubleshooting madness...
Switched it back...