PCI-E Port Bifurcation on Thunderbolt
 

PCI-E Port Bifurcation on Thunderbolt  

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C4PPY
(@c4ppy)
Active Member
Joined: 3 years ago
 

Hi Guys,

Have some of you tried if Bifucation is working on Thunderbolt 3 enclosures?

Considering going the laptop with TB3 enclosures instead of my desktop for more compact and high WAF setup for the home office.

Was eyeing the new HP zBook Studio G4.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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C4PPY
(@c4ppy)
Active Member
Joined: 3 years ago
 

Bump!

Nobody have tried this?

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

I'm sorry but I cannot understand your question. You will have to explain yourself better.

2016 15" HP ZBook 15 G3 (Xeon E3-1545M, Iris Pro p580, no dGPU) + [email protected] (Aorus Gaming Box) + Win10pro
2018 15" HP ZBook 15 G5 (i7-8850H, HD630, Quadro P1000) + [email protected] (Aorus Gaming Box) + Win10pro


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C4PPY
(@c4ppy)
Active Member
Joined: 3 years ago
 

PCI Bifurcation is a feature of the PCI standard with some chipsets that its possible to install a 1x PCI-E 16X to 2 PCI-E 8X risercard into the PCI-E port that make it possible to install two PCI-e cards over the bandwith of the one PCI-e x16 port.

See this forum thread: https://hardforum.com/threads/pcie-bifurcation.1870298/page-13

Was just thinking that this forum must have a user/Geek that have had tried this?

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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itsage
(@itsage)
Illustrious Member Admin
Joined: 3 years ago
 
Posted by: C4PPY

PCI Bifurcation is a feature of the PCI standard with some chipsets that its possible to install a 1x PCI-E 16X to 2 PCI-E 8X risercard into the PCI-E port that make it possible to install two PCI-e cards over the bandwith of the one PCI-e x16 port.

See this forum thread: https://hardforum.com/threads/pcie-bifurcation.1870298/page-13

Was just thinking that this forum must have a user/Geek that have had tried this?

Two hours well spent reading through those builds. I’m going to contact C_Payne and see if he has one of these dual risers left. 

external graphics card builds
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C4PPY
(@c4ppy)
Active Member
Joined: 3 years ago
 

Looking forward to hear your findings!

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Dude1
(@dude1)
Active Member
Joined: 3 years ago
 

 Also curious about this, would love to bifurcate then use The extra for a PCIe based SSD 

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tristank
(@tristank)
Active Member
Joined: 2 years ago
 

Any news on that?

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itsage
(@itsage)
Illustrious Member Admin
Joined: 3 years ago
 

Unfortunately I never managed to get one of the PCIe dual riser cards to test.

external graphics card builds
best laptops for external GPU
eGPU enclosure buyer's guide


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tristank
(@tristank)
Active Member
Joined: 2 years ago
 

What a bummer! What about the ASUS Hyper M.2 X16 Card, which depends on PCIe Slot Bifurcation support? Would it be possible to run a card like this in a thunderbolt 3 enclosure? What Laptops do support Bifurcation?

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Flash315
(@flash315)
Active Member
Joined: 2 years ago
 

tristank this may help you

http://www.dell.com/support/manuals/us/en/19/poweredge-r630/r630_om_pub/integrated-devices-details?guid=guid-0f237dca-ae8a-4972-985b-69da22be42ea&lang=en-us

i do know that the Gigabyte GA-Z270N-WIFI motherboard does support bifurcation

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Flint Ironstag
(@flint-ironstag)
Estimable Member
Joined: 3 years ago
 

Have you looked at One Stop Systems GPU Cubes?  Pretty sure they'll be announcing a Thunderbolt 3 version any day now.

https://www.onestopsystems.com/desktop-computing-appliances

Check the backplane interface and speed options.

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Flint Ironstag
(@flint-ironstag)
Estimable Member
Joined: 3 years ago
 

Seems like so many posters come on here, ask an interesting question, then disappear!  Would be great to capture some of what they learned (or not).  I may be impatient - it's pretty close to the holidays.

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dragon788
(@dragon788)
New Member
Joined: 1 year ago
 

I haven't tested a splitting riser, but I did test a Dell 4x M.2 NVMe drive card in a Razer Core X with a Dell XPS13 9360 (and will try my Precision 7510 at some point as well). The slot 0 M.2 card was recognized as /dev/nvme1n1 (nvme0 is the internal system drive) when I tested with both 1 card and 2 cards present in the adapter, but the second M.2 card didn't show up (would have expected /dev/nvme2n1 or /dev/nvme1n2). I only own a couple more NVMe drives and they are currently installed in the above mentioned laptops, but I am thinking about booting Ubuntu from USB with all 4 NVMe drives in the adapter to see if the other slots show up. I have a feeling that there would need to be additional hardware/firmware on the TB3 enclosure  (Razer Core X/et al) to properly support bifurcation though. From what I've read, Supermicro for their servers for example has two models of NVMe adapters, one has an "on card" bifurcation controller, the other relies on the motherboard to handle the signal splitting, and in our case (eGPU or at least external TB3 enclosures) I think we'll need the "on card" controllers, at least until more manufacturers realize people like having a portable system but want it to have some power when back at their desk as well.

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(@windfallx_yt)
New Member
Joined: 2 months ago
 
Posted by: @itsage
Posted by: C4PPY

PCI Bifurcation is a feature of the PCI standard with some chipsets that its possible to install a 1x PCI-E 16X to 2 PCI-E 8X risercard into the PCI-E port that make it possible to install two PCI-e cards over the bandwith of the one PCI-e x16 port.

See this forum thread: https://hardforum.com/threads/pcie-bifurcation.1870298/page-13

Was just thinking that this forum must have a user/Geek that have had tried this?

Two hours well spent reading through those builds. I'm going to contact C_Payne and see if he has one of these dual risers left. 

Hello, I'm new but very interested in this topic. I'm a regular on SFF Forum, and you can find C-Payne's risers on his site:

https://peine-braun.net/shop/

PS: Sorry for the dead thread revival

 

@dragon788

This is because that card relies on bifurcating an x16 connection into 4 x4 connections. Thunderbolt is limited to PCIe x4, so only one will work.

 

This post was modified 2 months ago

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

Try the OWC 4M2 with M.2 to PCIe risers?

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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

@chx

That should work. 1 lane per M.2 slot. The lanes come from the Thunderbolt controller.

The Node Duo has 2 lanes per PCIe slot. The lanes come from the Thunderbolt controller.

Since the lanes come from the Thunderbolt controller, there's no expensive PCIe switch which is require for PCIe slots that don't support bifurcation.

This post was modified 1 month ago

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