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PCIe Bifrucation

Hello there,

 

I am currently building a new computer. The computer will mostly be used for I/O heavy applications in a research context. 

I would like to use a ASUS Hyper M.2 X16 PCIe 4.0 X4 Expansion Card to run four M.2 SSDs. To use such an expansion card, the motherboard needs support for PCIe bifrucation. Quite naively I thought that this is common feature supported by most motherboards and just bought a Gigabyte B560M Aorus Elite which does not allow me to enable bifrucation. Therefore I am now searching for another motherboard that does support bifrucation and in my case an Intel i5 11400. 

 

Sadly I could not really find much regarding this feature on the product pages provided by the manufacturers. Maybe someone in this forum has some experience with this and can help me.

 

Maybe we can also start a table in this thread collecting motherboards with bifrucation support ?

 

 

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If there's not gonna be a better solution. You could always look into motherboards that have or come with such PCIe M.2 slot things.

Logic would dictate they need bifurcation too.

When i ask for more specs, don't expect me to know the answer!
I'm just helping YOU to help YOURSELF!
(The more info you give the easier it is for others to help you out!)

Not willing to capitulate to the ignorance of the masses!

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That was my thought as well. But that seems not to be true. The B560M Aorus Elite has one PCIe 4.0 4x and one PCIe 3.0 4x slot, but I can not find a option in the BIOS to enable it to split the PCIe 4.0 16x into 4x PCIe 4.0 4x.

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from what I could find with some googling it looks like bifurcation is a feature of the x or z type chipsets and not avaiable on b type boards.

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15 minutes ago, osar said:

That was my thought as well. But that seems not to be true. The B560M Aorus Elite has one PCIe 4.0 4x and one PCIe 3.0 4x slot, but I can not find a option in the BIOS to enable it to split the PCIe 4.0 16x into 4x PCIe 4.0 4x.

Single M.2 slot B560 boards do not have PCIe bifurcation, 11th gen gets dedicated lanes from the CPU to an M.2 slot. Even more M.2 slots are not indicative, you can have M.2 connected to the chipset as well.

 

There's this from Asus

https://www.asus.com/support/FAQ/1037507/

 

but other brands seem to require looking up each board's own manual. 

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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Might be easier to buy a PCIe card that supports BiF natively. I have two such cards in my Ivy Bridge workstation, they work just fine

So rise up, all ye lost ones, as one, we'll claw the clouds

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On 12/1/2021 at 4:54 PM, Radium_Angel said:

Might be easier to buy a PCIe card that supports BiF natively. I have two such cards in my Ivy Bridge workstation, they work just fine

Can you share the cards you are using ? I couldn't find one, at least with PCIe4.0 support. I remember that Linus at some point hat these honey badger cards, but those are quite expensive.

 

On 12/1/2021 at 4:38 PM, Dreckssackblase said:

from what I could find with some googling it looks like bifurcation is a feature of the x or z type chipsets and not avaiable on b type boards.

yes you are right about that. From what I have read Intels 11000 series chips seem not work for running these m.2 extension cards, since they do not support a split into four 4x slots, the max number of m.2 slots one can use with Intel 11000 series chips seems to be 3 when splitting the 16x slot into 8x/4x/4x.

 

Should have gone with AMD I guess. 

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