x10 Bifurcation support

Frank173

Member
Feb 14, 2018
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I am confused, how can the bios show x4x4x4x4 bifurcation when the motherboard you specified apparently does not have a full 16 lane slot? From the Supermicro product brief and manual it looks like this motherboard only supports max 8 lanes per slot.

I was totally astonished/overjoyed just now when I was updating a X10SRL-F to the latest Bios ... SM silently added bifurcation support for non Xeon-D x10 boards... - just had to share :)

View attachment 7082
 

nthu9280

Well-Known Member
Feb 3, 2016
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San Antonio, TX
Not sure on this specific board but on some SM boards they have 2 - x4 in x8 slots. You can configure one of the slots as x8 and the other as x0. or both as x4
 

jahsoul

Active Member
Dec 13, 2013
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War Eagle Country
Crazy, as they didn't give a crap about supporting bifurcation on my X10DRL-CT. Actually one of the last things that moved me away from Supermicro. :(
 

RTM

Active Member
Jan 26, 2014
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Crazy, as they didn't give a crap about supporting bifurcation on my X10DRL-CT. Actually one of the last things that moved me away from Supermicro. :(
You may want to test that again with an updated BIOS, while it is not the exact same platform, I just confirmed that 4 pm953 disks to work in an X10DRi motherboard, via an Asus Hyper M.2 X16 v2 card.
 
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68k-dude

Member
Jan 2, 2020
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Hello @Raice o/

For the X10SRL-F the user manual states that slots 3, 4, 5, 6 & 7 support bifurcation on page 77 section 4-11.

For the X10DRi the User Manual states that 3 ports are configurable in BIOS section IIO0 ( page 78 , 4-8) and a further 3 in IIO1 ( page 82 , 4-12). The slot numbers are not explicitly stated as far as I can see. IIO0 is likely referring to CPU1 and IIO1 to CPU2. The board has only 6 slots so that would mean all of them are configurable. CPU1 is connected to Slots 1, 2, 3 and CPU2 to slots 4, 5, 6 .

Good luck and best regards

-68k
 
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Raice

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Jul 12, 2017
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Guangzhou, China
Hello @Raice o/

For the X10SRL-F the user manual states that slots 3, 4, 5, 6 & 7 support bifurcation on page 77 section 4-11.

For the X10DRi the User Manual states that 3 ports are configurable in BIOS section IIO0 ( page 78 , 4-8) and a further 3 in IIO1 ( page 82 , 4-12). The slot numbers are not explicitly stated as far as I can see. IIO0 is likely referring to CPU1 and IIO1 to CPU2. The board has only 6 slots so that would mean all of them are configurable. CPU1 is connected to Slots 1, 2, 3 and CPU2 to slots 4, 5, 6 .

Good luck and best regards

-68k
Thank you! Also, do you know anything about X10DRX? I read the manual, but can't get if it supports bifurcation an all slots or only on 6
 

68k-dude

Member
Jan 2, 2020
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Hello @Raice

Looking online I found this webpage from the SuperMicro support forums


From there you can see that the Slots are grouped into ports. I can see that they are all in a port grouping so that would indicate that all slots are configurable. Actually all apart from Slot 11. This is a PCIe 2.0 x 4. The Manual shows the Block diagram on page 18, 1-10 . This shows Slot 11 as coming from the DMI port.

All of the other slots seem to be configurable in convenient ports. On page 80, 4-10 there are details of the PCIe configuration

Good luck and best regards

-68k