[Solved] (SOLVED) Mantiz MZ-03 Saturn Pro eGPU ( V2 ) performs significantly better when daisy chained through a Dell WD19TB Thunderbolt 3 Dock? (SOLVED)  

I dunno if it applies to your setup but my system was having a shit ton of instability issues if I ran usb and thunderbolt at the same time which killed the performance of my 2080ti. I also got it fixed by daisy chaining everything (egpu and all usb) through one port through a thunderbolt hub.

@mangowuzhere, Yeah, I also saw stability increase when all my peripherals were attached to the Dell dock, and none were in the Mantiz.

I am currently testing it with my NUC8I5BEH to see if the issue is with my laptop. 

@boltoway, This is an interesting scenario with a dynamic bandwidth throughput on the Dell Vostro 7500. I wonder if it's related to the NVM firmware on the laptop TB3 controller. Can you download and install HWiNFO64 and share a screenshot of the expanded PCI Express Root where the TB3 port connects?

Huh, odd. Whats the laptop model? Can anyone else try this with their setup? I'd be interested in knowing if this is reproducable across all eGPU's.

@itsage, I am starting to believe it is more to do with the Vostro itself than the eGPU. Running the Mantiz directly to my NUC8I5BEH I scored much higher on Unigine Heaven than I did with the Vostro 15 7000. When running the Mantiz to the NUC through the WD19TB, I saw a small performance reduction, in line with what has previously been experienced with Daisy Chaining.

NUC + Mantiz eGPU direct:

NUC + Mantiz via WD19TB:

The NUC performs better in both scenarios and loses a very small amount of performance while Daisy Chained.

HWiNFO64: (The Mantiz was not attached at the time of this screenshot, but the WD19TB was. I am going to pick up a Razer Core X next week to see how it goes daisy chained with a higher end GPU).

@lycid 2020 Dell Vostro 15 7000 (7500).

@itsage, So I managed to pick up a Razer Core X and GTX 2070 Super today. It is getting late, so I only quickly benchmarked it, but the performance is far lower than I expected. This is daisy chained to the Dell WD19TB. 

@boltoway, Best eGPU performance is with direct Thunderbolt 3 connection rather than daisy-chaining to a TB3. I'm not sure why your Vostro 15 7000 (7500) is limiting the eGPU enclosure at 20Gbps when it's connected to the TB3 port directly. Check the BIOS or contact Dell support if they have any insights.

@itsage I have done some further testing, and the Vostro is performing far worse than it should be, and is also plagued by extreme freezing (30+ seconds and black screening). This is rather unfortuanate, as I was extremely happy with the laptop otherwise. 

Vostro + RTX 2070 Super + Razer Core X:

NUC8I5BEH + RTX 2070 Super + Razer Core X:

The results match the original post; the Vostro performs similarly when daisy-chained through the WD19TB or when directly connected, but also is bested by a much lower-performance NUC. 

Also, one thing I did notice with the Vostro is in the Cuda-Z performance tab, where the host to device and device to host speed would fluctuate dynamically from over 2000mbps to under 1000. Is this abnormal behaviour? The NUC is very consistent in CUDA-Z with the reported transfer speeds.

@boltoway, The CUDA-Z Performance tab readout should be consistent. The fluctuations you observed in the Vostro explains the freezing behaviors. Have you checked the PCH temps?