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Article: USB 4.0 Is A No-Go, For Now


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On 8/16/2021 at 5:35 AM, AudioDoctor said:

the latest USB schemes are very confusing.

 

Here's what I recently figured out (corrections appreciated, of course):

 

USB 3.1 is identical to USB 3.2!  The speed is specified by the Gen suffix, not by the .1 or .2 suffix.  Weird.

 

USB 3.1/3.2 Gen 1 = USB 3.0 = 625 MB/s = 5 Gbps.

USB 3.1/3.2 Gen 2 = 1250 MB/s = 10 Gbps.

USB 3.2 Gen 2x2 = 2500 MB/s = 20 Gbps.  (I think this is same as USB 3.1 Gen 3.)

USB 4.0 = 5000 MB/s = 40 Gbps.

 

Thunderbolt 1 = 1250 MB/s = 10 Gbps.

Thunderbolt 2 = 2500 MB/s = 20 Gbps.

Thunderbolt 3 = 5000 MB/s = 40 Gbps.

Thunderbolt 4 = ??

 

Thunderbolt 1 & 2 use identical Apple-only connector.

 

Thunderbolt 3 & 4 use same USB-C connector as USB 3.1/3.2, but Thunderbolt 3 and USB protocols are different.  Thunderbolt 3 hosts on Mac can communicate with USB Gen 1 and Gen 2 peripherals but probably not Gen 2x2.

 

M1 Mac Mini has USB-C connectors with USB 4.0 and Thunderbolt 3.

Mac Mini (2012 i7) > HQPlayer > RME ADI-2 v2 > Benchmark AHB-2 > Thiel 3.7

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10 minutes ago, Bob Stern said:

 

Here's what I recently figured out (corrections appreciated, of course):

 

USB 3.1 is identical to USB 3.2!  The speed is specified by the Gen suffix, not by the .1 or .2 suffix.  Weird.

 

USB 3.1/3.2 Gen 1 = USB 3.0 = 625 MB/s = 5 Gbps.

USB 3.1/3.2 Gen 2 = 1250 MB/s = 10 Gbps.

USB 3.2 Gen 2x2 = 2500 MB/s = 20 Gbps.  (I think this is same as USB 3.1 Gen 3.)

USB 4.0 = 5000 MB/s = 40 Gbps.

 

Thunderbolt 1 = 1250 MB/s = 10 Gbps.

Thunderbolt 2 = 2500 MB/s = 20 Gbps.

Thunderbolt 3 = 5000 MB/s = 40 Gbps.

Thunderbolt 4 = ??

 

Thunderbolt 1 & 2 use identical Apple-only connector.

 

Thunderbolt 3 & 4 use same USB-C connector as USB 3.1/3.2, but Thunderbolt 3 and USB protocols are different.  Thunderbolt 3 hosts on Mac can communicate with USB Gen 1 and Gen 2 peripherals but probably not Gen 2x2.

 

M1 Mac Mini has USB-C connectors with USB 4.0 and Thunderbolt 3.

 

Thanks, I will print this out and reference it when needed. ;-)

No electron left behind...

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  • 3 weeks later...

Dear experts,😀

Could you please help me understand what real-world throughput I can possibly get for the following setup (please note DASD employs Intel JHL7440 Thunderbolt 3 controller Chris discussed in his article)?

iMac <--> Thunderbolt™ 3 Optical Cable <--> OWC ThunderBay Flex 8😀

Does the throughput depend on the direction of the data flow?

Cable length?

HDD / SSD / RAID configuration employed? Any optimum (performance / price) configuration you would recommend?

Any Thunderbolt controller with native Thunderbolt 4 or USB 4.0 support (at least in the specs), and DASD's employing it?

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I'm more interested in the sound of the drive than just its' speed. I use an internal sata hdd on quiet external power to avoid electrical noise. As it's the only sata device in the box there's little or no contention/jitter. I also read the thread on audiophile nvme ssds with external power which try to address these issues (but too small capacity for me). I wonder whether anyone has done any testing of these aspects of the very fast drive/interface options?

 

 

 

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