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#1 | ROG STRIX B550-I GAMING - Enable x8x4x4 bifurcation possible? datum

Mon Mar 08, 2021 5:13 pm

I bought this board reading that bifurcation is possible, but turns out only x8x8 is available in the BIOS, whereas I need x8x4x4 for my riser.

Some boards have the PCI bifurcation setting in the PBS menu, but this one has very little there.

My understanding is this should be possible on this chipset/CPU - so hoping it can be unlocked in a modded BIOS.

Can anyone help with this please?

Support page: https://rog.asus.com/uk/motherboards/rog...l/helpdesk_bios
Latest BIOS: https://dlcdnets.asus.com/pub/ASUS/mb/So...G-ASUS-1803.ZIP

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#2 | RE: ROG STRIX B550-I GAMING - Enable x8x4x4 bifurcation possible? datum

Tue Mar 09, 2021 10:46 am (Last edited: Tue Mar 09, 2021 10:46 am)

marcosscriven

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Posts:	21
Registered since:	11.02.2019

I see two results for the string "x8x4x4" in UEFI tool. Extracting the PE32 file and extracting IFR, I see the same in both:

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                                   Form Sets
--------------------------------------------------------------------------------
Offset:         Title:
--------------------------------------------------------------------------------
0x5FA8          AMD PBS (0x2 from string package 0x0)
 

Within there, the match for "x8x4" is:

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0x6124                  Suppress If: {0A 82}
0x6126                          Variable 0x2 equals value in list (0x1, 0x3, 0x4, 0x6) {14 8E 02 00 04 00 01 00 03 00 04 00 06 00}
0x6134                                  Not {17 02}
0x6136                          End {29 02}
0x6138                          Setting: PCIe/GFX Lanes Configuration, Variable: 0x11 {05 91 09 00 0A 00 08 00 01 00 11 00 10 10 00 03 00}
0x6149                                  Option: x16, Value: 0x0 (default) {09 07 0B 00 10 00 00}
0x6150                                  Option: x8x8, Value: 0x1 {09 07 0C 00 00 00 01}
0x6157                                  Option: x8x4x4, Value: 0x2 {09 07 0D 00 00 00 02}
0x615E                                  Option: x4x4x4x4, Value: 0x3 {09 07 0E 00 00 00 03}
0x6165                          End of Options {29 02}
0x6167                  End If {29 02}
0x6169                  Suppress If: {0A 82}
0x616B                          Variable 0x2 equals value in list (0x5) {14 88 02 00 01 00 05 00}
0x6173                                  Not {17 02}
0x6175                          End {29 02}
0x6177                          Setting: PCIe/GFX Lanes Configuration, Variable: 0x11 {05 91 09 00 0A 00 09 00 01 00 11 00 10 10 00 02 00}
0x6188                                  Option: x16, Value: 0x0 (default) {09 07 0B 00 10 00 00}
0x618F                                  Option: x8x8, Value: 0x1 {09 07 0C 00 00 00 01}
0x6196                                  Option: x8x4x4, Value: 0x2 {09 07 0D 00 00 00 02}
0x619D                          End of Options {29 02}
0x619F                  End If {29 02}
 
 

I've seen guides on enabling the PBS menu itself ([OFFER] Gigabyte GA-AX370-Aorus Gaming 5 BIOS mod (12)), but not individual items within the menu.

In my case the BIOS already shows the PBS menu, but not these bifurcation options.

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