eGPU TB3 Performance loss Futureproof

[Caius Filimon]

Hi guys,

 

I am planning on purchasing an eGPU some time next year, however I do not know how future proof it would be. 

 

From what I have read so far, there is next to no performance loss (about 5%) when it comes to lower fps (60-70 fps) such as on 4K gaming. However, I have a few questions.

 

Do you believe that the bottlenecking would be a massive problem with the next Nvidia GPUs? Namely, will the performance loss from TB3 be worse than the upgrade from a 1070 to a 1170, as an example?

 

And what really are the performance losses on TB3 when upgrading GPU power? If a 1080 is 50% more powerful than a 1070, what would be the power gain from 1070 to 1080 egpu? 30% instead? I am trying to gauge the % performance loss from more powerful GPUs to try and see how future proof thunderbolt 3 eGPU cases are, and if they would be worthwhile for me.

 

Are there any 'hacks' to use multiple TB3 ports? How would I know if my two TB3 ports share the same 4 PCIe lanes?

 

Ideally I would like for there to be a no more than 10% performance loss from an 1180, to compare to today's 5% performance loss from a 1080 egpu (on low fps).

 

Any thoughts? Disorganized question, mainly because there's little I know about performance loss and there's a lot of ground to cover. Hope someone can share their opinions/expertise.

[Caius Filimon]

5 minutes ago, Abyssal Radon said:

I don’t think the performance loss with using a eGPU dock is something to worry about. I would look at online benchmarks comparing native PCIE performance versus external PCIE performance through Thunderbolt 3.

Thank you very much for your reply!

 

Cool alright, should I google for that exactly? As in, what keywords should I go for

[Caius Filimon]

3 hours ago, Abyssal Radon said:

Sorry for the late reply, here is a decent thing I found https://egpu.io/forums/mac-setup/pcie-slot-dgpu-vs-thunderbolt-3-egpu-internal-display-test/ that should give you an idea of what to expect.

Thank you very much. Although, that refers to internal display egpu bottlenecking which is far more considerable.

 

https://egpu.io/forums/mac-setup/pcie-slot-dgpu-vs-thunderbolt-3-egpu-internal-display-test/

 

From that it seems that it varies a crap ton. Even a Titan X 12GB experiences only 20% performance loss with an external monitor using TB2; not even the double speed TB3.