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teltersat
(@teltersat)
Eminent Member
Joined: 1 year ago
 

Hey guys, I have a question that has been digging through my brain for quite a bit. Is there any performance degradation when you use a long TB3 Active cable (2m) vs a short passive one? (50cm). I'm asking because the way my setup is laid out I really need the 2m cable, but I'm not sure if I'm being penalized for it...

MacBook Pro Touch Bar 2017 15" + Mantiz Venus MZ-02 + AMD Radeon Vega 64

 
2017 15" MacBook Pro (RP560) [7th,4C,H] + RX 580 @ 32Gbps-TB3 (Mantiz Venus) + Win10 [build link]  


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DrEGPU
(@dregpu)
Trusted Member
Joined: 2 years ago
 

I can give it a try tonight or tomorrow. I've been using a short passive cable with the Razer core X on my desk. I have a 2m active cable on hand. It would be nice to reclaim some desk space!

MBP 2018 16 inch + Razer Core X@40Gbps-TB1 (Zotac RTX 2080 Ti Amp) + Ubuntu 20.04, Win10

 
2011 13" MacBook Pro [2nd,2C,M] + RTX 2080 Ti @ 10Gbps-TB1>TB3 (Razer Core X) + Linux Ubuntu 18.04.02 LTS [build link]  


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odin
 odin
(@odin)
Trusted Member
Joined: 2 years ago
 

I don't think there is a difference. You can always buy it and do some benchmarks, return it if there's a large dip. Frankly I'd probably just use it and see if you NOTICE anything. Benchmarks are good for comparisons, but it's really more important how you feel using it.

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2018 17" LG Gram 17 [8th,4C,U] + RTX 2070 @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  


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joevt
(@joevt)
Noble Member
Joined: 3 years ago
 

I don't think cable length matters. Speed of electricity is very fast. an extra 1.5m will add up to a handful of micro seconds to the time it takes for a bit to reach the other end. This is not a problem because many bits are sent before expecting a reply.

Problems can arise if the extra length adds errors but the active part of the cable handles that.

https://9to5mac.com/2018/08/23/back-to-the-mac-011-are-longer-thunderbolt-3-cables-slower-video/

Drop in performance happens when you chain multiple Thunderbolt 3 devices together.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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nando4
(@nando4)
Noble Member Admin
Joined: 4 years ago
 

2m active 40Gbps TB3 cable benched giving full H2D bandwidth at:

https://egpu.io/forums/builds/acer-aspire-v17-nitro-black-editionakitio-nodegtx1070-win-10/#tb3-cables

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

 
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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 3 years ago
 

Bandwidth would not be an issue between active vs. passive. I'm interested in seeing latency differences.

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cuppino
(@cuppino)
Trusted Member
Joined: 2 years ago
 
Posted by: @teltersat

Hey guys, I have a question that has been digging through my brain for quite a bit. Is there any performance degradation when you use a long TB3 Active cable (2m) vs a short passive one? (50cm). I'm asking because the way my setup is laid out I really need the 2m cable, but I'm not sure if I'm being penalized for it...

I'm using this ( https://www.belkin.com/us/p/P-F2CD085/) and I'm finding it great!
I haven't had any performance loss, on the contrary it's all very stable!
You can also find it on the apple website. I bought it there.

iMac 27" 5k 2019 (i9 9900k 3,6ghz, 40gb ram ddr4 2666 mhz, ssd 1tb, dgpu Radeon pro vega 48 8gb), Egpu: Razer Core X with ZOTAC GAMING GeForce RTX 2080 Ti AMP Extreme Core
Osx 10.15.5
Windows 10 pro 2004 - 19041.329 (bootcamp with external ssd 1tb Samsung evo 860)


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esatamacmodular
(@esatamacmodular)
Estimable Member
Joined: 3 years ago
 
Posted by: @cuppino

I'm using this ( https://www.belkin.com/us/p/P-F2CD085/) and I'm finding it great!

I haven't had any performance loss, on the contrary it's all very stable!

You can also find it on the apple website. I bought it there.

link does not work for me...

So people like the belkin and cable matters. Where does that leave the akitio one?

https://www.akitio.com/cables/40gbps-thunderbolt3-cable-2m

iMac 2013 10.14.1, Macbook Air 2013 10.11, MBP 2016 13" 10.13.6 , HP 4530s 10.11, node lite, DA-2 PSU w/mod, PE4L 2.1b expresscard34, GTX460,1050Ti,1060,1070/Ti RX470,560,580

 
2016 13" MacBook Pro [6th,2C,U] + GTX 1060 @ 32Gbps-TB3 (AKiTiO Node Lite) + macOS 10.13.6 [build link]  


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cuppino
(@cuppino)
Trusted Member
Joined: 2 years ago
 
Posted by: @esatamacmodular
Posted by: @cuppino

I'm using this ( https://www.belkin.com/us/p/P-F2CD085/) and I'm finding it great!

I haven't had any performance loss, on the contrary it's all very stable!

You can also find it on the apple website. I bought it there.

link does not work for me...

I send you the link to the Apple store. https://www.apple.com/shop/product/HMBH2ZM/A/belkin-thunderbolt-3-5a-cable-2-m?fnode=e5656ecb271d658a9f3d405dc15561e3bf9726a4f69cef69ca98fa108f643cd61956a251d268acb3a18bce582a6326de4ef61eb3049929d43bed4c429daf46b79643cc6e0227758464f794b4ccda862598c4852f4b26a3a7f548990e7f70f65b

Posted by: @esatamacmodular

So people like the belkin and cable matters. Where does that leave the akitio one?

https://www.akitio.com/cables/40gbps-thunderbolt3-cable-2m

has the same features as the belkin cable.
I preferred the belkin because I knew the brand.
With my razer core x it works perfectly.

iMac 27" 5k 2019 (i9 9900k 3,6ghz, 40gb ram ddr4 2666 mhz, ssd 1tb, dgpu Radeon pro vega 48 8gb), Egpu: Razer Core X with ZOTAC GAMING GeForce RTX 2080 Ti AMP Extreme Core
Osx 10.15.5
Windows 10 pro 2004 - 19041.329 (bootcamp with external ssd 1tb Samsung evo 860)


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esatamacmodular
(@esatamacmodular)
Estimable Member
Joined: 3 years ago
 

@cuppino

Ok thanks, I see these specs listed for belkin and then akitio - both 2m cables:

Belkin
Thunderbolt 3 male to Thunderbolt 3 male connectors

Transfer data at up to 40 Gbps

Connect to Thunderbolt 3– or USB-C–enabled devices and displays

Supports Thunderbolt/HD displays

Take advantage of up to 100W power delivery

Thunderbolt certified

Akitio:

  • Lightning fast data transfer rates up to 40 Gbps
  • Supports Thunderbolt™ and USB 2.0 protocols
  • Supports power delivery up to 100W
  • Reversible USB-C connector

maybe the belkin is more versatile?

iMac 2013 10.14.1, Macbook Air 2013 10.11, MBP 2016 13" 10.13.6 , HP 4530s 10.11, node lite, DA-2 PSU w/mod, PE4L 2.1b expresscard34, GTX460,1050Ti,1060,1070/Ti RX470,560,580

 
2016 13" MacBook Pro [6th,2C,U] + GTX 1060 @ 32Gbps-TB3 (AKiTiO Node Lite) + macOS 10.13.6 [build link]  


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