TB3 cables 50cm, 80cm (both passive) and 150cm (active). TB2 cables with TB2->TB3 adapter. USB 3.1 Gen 2 vs USB3.0 vs USB2.0  

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OliverB
(@oliverb)
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OliverB
(@oliverb)
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November 9, 2018 11:02 pm  

Some conclusion from the results:

- Under MacOSX the active cable 150cm has a bandwith drop from about 10%. GfxBench Metal Offscreen, which is very reliable, drops about 5% with the 150cm active cable.
- Under Windows 10 there doesn't seem to be any drop.
- The performance of the passive cables 50cm and 80cm is the same on both systems.
- Games and synthetic benchmarks like Ungine Valley look the same for each TB3 cable. However, their performances are clearly influenced by less powerful CPU.
- The bandwith for the TB2->TB3 setup is about 55% compared to the pure TB3 system.
- Luxmark is hardly affected by the lower bandwith of the TB2 -> TB3 setup.
- The Cuda Values for "Pageable" are much higher for MacOSX than Windows. It's unknown if this has any relevance to the general performance.
- There is no reduced bandwith for MacOSX Systems, as mentionedbefore  in this forum.
- Another note: The TB3 150cm active cable only supports USB2.0, if used for it.


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OliverB
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November 10, 2018 9:40 am  

I made some benchmarks concerning USB Protocol and TB3 cables: To measure DiskSpeed I built a SSD external with the following hardware:
-XT-Xinte USB3.1 TO PCI-e NVMe SSD Enclosure
-Kingston A1000 SA1000M8/240G SSD

connected to: DiskSpeed:
MacBookPro 2018 TB3-Port, via
-50 cm passive TB3-cable
-80 cm passive TB3-cable
-100 cm USBC-cable

Asus XG Station Pro USB-C 10 Gbit/s Port, via
-50 cm passive TB3-cable

Adapter with USB-A (3.0) Port or USB-C 5 Gbit/s Port
or MacBookPro 2018 USB-A (3.0) Port, via
-30 cm USB-A <-> USB-C cable

MacBookPro 2018 TB3-Port, via
- 150cm active TB3 cable

 

Samsung S24H850-USB2.0-Hub, via
-30 cm USB-A <-> USB-C cable


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OliverB
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November 10, 2018 9:57 am  

Note:
- The write speed via USB3.1 Gen2 Protocol is mostly 800MB/s, at the end of test it falls back to 600MB/s for some yet unknown reason.
- The maximal transfer speed for read I measured was 955 MB/s.
- You have to use an NVMe SSD to get to those transfer rated, because SATA is limited to 6 Gbit/s.
- It's very notable to work with the 10GB/s protocol, the read transfer is more than double and it feels even more.
- The Asus XP Station Pro actually upgrades the USB3 ability of Macbook (Pros) 2015 and older with Thunderbolt 1/2 from 5 GBit/s to 10GBit/s.
- It's correct, that active TB3 cables only support USB2.0

The differences between nominal and real transfer rates are:

Protocol Nominal Real Lost Ratio
USB3.1 Gen 2 10 Gbit/s 7.64 Gbit/s 23.6%
USB3.0 5 Gbit/s 3.33 Gbit/s 33.4%
USB2.0 480 MBit/s 333 Mbit/s 30.5%

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 chx
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November 12, 2018 9:03 am  
Posted by: OliverB

Note:
- The write speed via USB3.1 Gen2 Protocol is mostly 800GB/s, at the end of test it falls back to 600GB/s for some yet unknown reason.
- The maximal transfer speed for read I measured was 955 GB/s.

I think that was megabyte per second.


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OliverB
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November 13, 2018 4:35 pm  
Posted by: chx
Posted by: OliverB

Note:
- The write speed via USB3.1 Gen2 Protocol is mostly 800GB/s, at the end of test it falls back to 600GB/s for some yet unknown reason.
- The maximal transfer speed for read I measured was 955 GB/s.

I think that was megabyte per second.

Of course! Thank you for your hint.


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