PCI Express vs. Thunderbolt - How much performance drop of your GPU you will have if you put it in eGPU  

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precision01
(@precision01)
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July 18, 2017 7:35 pm  

Great benchmarks, enjoy.

Did you manage to do the same tests with a GTX 1070 ou GTX 1080?

I'm curious to see the performance drop with the faster pascal cards. Some users are saying that the impact is way higher on GTX 1070.


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pewpewfish
(@pewpewfish)
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Joined: 1 year  ago
Posts: 8
July 18, 2017 9:39 pm  
Posted by: ImDe

Guys, can you explain why there is no difference between thunderbolt 1,2,3 on external monitor at 4k in your tests? (you show only 20% drop Vs desktop PCIe) 

 

And how does it work with thunderbolt 3 with jhl6240 (PCIE 3.0 x2) on external 4k? Remaining bandwith, overall speed like with thunderbolt 2?

I'd like to know this too. I'm in the market for a new laptop but can't get behind the new MBP 15's keyboard. If I can get a TB2 version and still get the same results I'd be pretty happy since I get a good keyboard too!


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egpumac
(@egpumac)
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Joined: 2 years  ago
Posts: 2
August 14, 2017 7:12 pm  

I have a Mid-2012 Macbook Pro with ThunderBolt 1 (10gbps) and I am thinking about an egpu (Akitio) to play Oculus Rift VR. Is that a possible setup?


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ZPERO
(@zpero)
New Member
Joined: 1 year  ago
Posts: 1
September 21, 2017 9:49 pm  

Nice job doing all that testing!

 

I have a Lenovo Y410P and I would like to know if it would be possible for me to run an eGPU and display to the internal screen with my laptop. I have no TB port, but I do have an ultrabay that runs at PCIe 3.0 x8 (although I would like someone to confirm that for me). So in theory I think that should be twice the bandwidth as a TB3 port right? I would need some kind of adapter, as well as the removal of the DVD drive, which sits in the ultrabay from he factory. 

 

Thanks,

ZPERO


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Yukikaze
(@yukikaze)
Prominent Member Moderator
Joined: 2 years  ago
Posts: 808
September 21, 2017 10:31 pm  

There is a guy who goes by Gerald who managed to get an ultrabay eGPU adapter put together for the Y510p. It sold on ebay about a year back, or maybe a bit more. Due to BIOS block on NV cards, you had to use an AMD card with it, but it worked just fine. He has a new batch up for sale right now. The cost is 80 EUR + 20 EUR for shipping.

You can register at his doodle here.

I do not know if it works with a Y410p as well, but you can reach out to him and ask in the comments.

My eGPU Zoo - Link to my Implementations.
Want to output [email protected] out of an old system on the cheap? Read here.
"Always listen to experts. They'll tell you what can't be done, and why. Then do it."- Robert A. Heinlein, "Time Enough for Love."


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SE12897
(@se12897)
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Posts: 56
April 30, 2018 7:04 pm  

So when we say internal display causes FPS drops is it really because of the data transfer back over TB3? Isn't TB3 and PCIe Full Duplex? Ethernet is full duplex so that means 2gbps when both directions are being utilized.. Minus overhead. The two shouldn't interfere with each other.

I always figured it was one of two things.. 
1) encoding and decoding full duplex data on the TB3 chip is causing the slow down
2) Slow ram speeds.

I remember when I bought my 13R3 with a single stick of 8GB of ram. And games performed worse when using optimus when on external displays. (x8 3.0 link) When I jumped up to dual channel 32GB, the games performed only slightly slower. 4% slower. 

When not in games, apps like svp (the 60 fps video interpolation software) performed awful when using single channel. 

In other words, I think Dual and single channel ram could make a difference in internal display performance. I wish I still have my 13R3 for testing this on eGPUs..


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SE12897
(@se12897)
Trusted Member
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Posts: 56
April 30, 2018 7:07 pm  
Posted by: pewpewfish
Posted by: ImDe

Guys, can you explain why there is no difference between thunderbolt 1,2,3 on external monitor at 4k in your tests? (you show only 20% drop Vs desktop PCIe) 

 

And how does it work with thunderbolt 3 with jhl6240 (PCIE 3.0 x2) on external 4k? Remaining bandwith, overall speed like with thunderbolt 2?

I'd like to know this too. I'm in the market for a new laptop but can't get behind the new MBP 15's keyboard. If I can get a TB2 version and still get the same results I'd be pretty happy since I get a good keyboard too!

It's because the FPS is so low it's under the threshold of the performance impact TB3 has.


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ikir
 ikir
(@ikir)
Prominent Member
Joined: 2 years  ago
Posts: 753
May 2, 2018 6:47 pm  

16-4% performance drop with Thunderbolt 3 is very reasonable. Pretty cool.

eGPU.it | LG 34" 4K 34UC88 curved ultrawide display
MacBook Pro 2018 Touch Bar i7 quad-core 2.7Ghz - 16GB RAM - 512GB PCIe SSD --> my Mantiz Venus extreme mod with Sapphire Nitro+ RX Vega 64


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