Chaining Thunderbolt dock with NVMe and DisplayPort?
 
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Chaining Thunderbolt dock with NVMe and DisplayPort?  

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chx
 chx
(@chx)
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Joined: 3 years ago
 

https://www.aliexpress.com/item/4000958600017.html  this would be good but it's HDMI instead of DisplayPort.

https://www.aliexpress.com/item/32978981775.html this would be good but it's dual M.2 and expensive.

Would anyone know of a mix of the two for 200 USD-ish 🙂 ?

Lenovo ThinkPad 25 -- GALAX SNPR TB3 1060 -- Lenovo Graphics Dock -- Benq BL2411PT - - two PackedPixels - Dasung not-eReader backer


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joevt
(@joevt)
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@chx, the downstream Thunderbolt port can be used for DisplayPort. If you want dual DisplayPort, then you need another dock or a Thunderbolt 3 to Dual DisplayPort adapter.

The OWC Mercury Helios 3S can accomodate a PCIe to NVMe adapter, has DisplayPort out and downstream Thunderbolt port, and large amount of power delivery.
https://eshop.macsales.com/search/?filter.catidpath=3683%2F3709%2F4660%2F4661&sort.price=asc

 

 

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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chx
 chx
(@chx)
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Joined: 3 years ago
 

I am well aware the downstream TB3 port can be used for DP alt mode, for eg just yesterday I posted https://www.reddit.com/r/UsbCHardware/comments/i0f870/any_usb_32_2x2_hubs_with_usbc_display_alt_mode/fzpaai1/

I just wanted to save on dongles, that is all. But I guess I will go with the JEYI dock, have you seen the size of that thing??

Lenovo ThinkPad 25 -- GALAX SNPR TB3 1060 -- Lenovo Graphics Dock -- Benq BL2411PT - - two PackedPixels - Dasung not-eReader backer


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joevt
(@joevt)
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@chx, The Jeyi does look nice and compact.

 

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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joevt
(@joevt)
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The poster in the reddit message wants a USB 3.2 gen 2x2 hub - how many USB 3.2 gen 2x2 devices exist in the world?

I'm not sure USB4 or Thunderbolt 4 will support USB 3.2 gen 2x2. Thunderbolt 3 certainly does not - but someone could make a dock that has a USB 3.2 gen 2x2 controller.

If the hub is not USB4 or Thunderbolt, then there's no way to do USB 3.2 gen 2x2 and DisplayPort at the same time - when you connect a display, 2 lanes will be used for DisplayPort leaving only 2 lines for gen 2x1.

 

This post was modified 3 months ago

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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chx
 chx
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Nah, poster there is just confused by USB C marketing, it happens. It's the default, even. I wouldn't be surprised if most USB 4 full featured devices would support 2x2. Initially , but if memory serves not in the actual standard , the TB3 bus was called "Gen 3x2" which in the perverse logic of USB IF makes sense: Gen 3 signalling on two lanes in each direction. 

Lenovo ThinkPad 25 -- GALAX SNPR TB3 1060 -- Lenovo Graphics Dock -- Benq BL2411PT - - two PackedPixels - Dasung not-eReader backer


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joevt
(@joevt)
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@chx, Right.

USB4 gen 3x2 is slightly different than Thunderbolt's gen 3x2 (20 Gbps vs 20.625 Gbps per lane). There's also USB4 gen 2x2 which is 20 Gbps for USB4 or 20.625 Gbps for Thunderbolt 3 (similar to Thunderbolt 2). There's also single lane USB4/Thunderbolt modes (10 Gbps for USB4 gen 2 or 10.3125 for Thunderbolt 3 (similar to Thunderbolt 1) or 20 for USB4 gen 3 or 20.625 Gbps for Thunderbolt 3). Single lane modes should only happen if you have a bad cable/connection.

All those USB4 or Thunderbolt modes include tunnelling for PCIe and DisplayPort (and USB 3.x for USB4) which makes them different from USB 3.2 modes (1x1, 2x1, 1x2, and 2x2) which are just USB.

The wikipedia article mentions possible inclusion of USB 3.2 gen 2x2 in USB4. It refers to section 9.2.1 of the USB4 spec. I believe the USB3 Adapter Layer that it mentions is the part that converts USB to/from USB4 tunnelling. The Adapter Layer has a Link Layer which is where the USB 3.2 signals begin (next to the USB 3.2 protocol layer). The section says this can optionally allow gen 2x2. This implies that gen 2x2 can be tunnelled. Actually, section 8.2.2.5 describes the USB3 Adapter Configuration Capability registers, and shows an option for gen 2x2 (20 Gbps). The only other option is gen 2x1 (10 Gbps) which means USB can't be tunnelled faster than 20 Gbps. If you want more speed than that then you need to use PCIe tunnelling like what Thunderbolt used.
https://en.wikipedia.org/wiki/USB4

 

 

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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