Weired MSI B560M PRO (MS-7D20) - not starting with 11-th gen. CPU, 10-th gen. OK

[DynaxSC]

Hi,

I have a very weired problem with MSI B560M PRO (MS-7D20), board is upgraded to the latest BIOS version v1.9.

The board is normally starting with 10-th gen. CPU, ie. Intel Comet Lake i5-10600K and Celeron G5905.

However if I install a 11-th gen. Rocket Lake i5-11600K the board powers up, but is immediately stuck on CPU LED, not progressing further. Debug card shows FF, and after restart with long short of Power Button: FE, which is as usually of no help (Reserved for future AMI error codes).

According to MSI compatibility site the board supports all these processors, inclusive the i5-11600K.

The CPU's are all working without any issue on a very simimar MSI board MSI B560M PRO-E (MS-7D22, newest bios 2.C0), the main difference I discovered in this board is a different CPU VRM:

• the MSI B560M PRO (MS-7D20) has a On Semi NCP81267,
• the MSI B560M PRO-E (MS-7D22) has a Richtek RT3607,

and the PRO-E i missing Display Port (which is most probably irrelevant).

I thought the B560M PRO might have an too old CPU microcode (the i5-11600K CPU ID is A0671), so I exchanged the microcode to the newest available (cpuA0671_plat02_ver00000062_2024-03-07_PRD_2B7D62D5.bin), but this did not change anything.

Then I updated the Management Engine from 15.0.45.2411 (included in bios v1.90) to the newest Intel version 15.0.49.2573 - also did not help.

Then I suspected the bios of the B560M PRO might not be maintained by MSI correctly, so I just programmed the working MSI B560 PRO-E stock bios to the MSI B560 PRO by hard.
This also did not change anything, so 10-th gen. CPU's are working on B560M PRO even with the somewhat "alien" bios from PRO-E, but 11-th gen not.
I tried also to set a much higher power limits in the bios using a different CPU, and then exchanging the CPU to i5-11600K, but to no avail.

I any case the VCORE and all other voltages of the CPU is beeing provided correctly, so seems no issue with different VRM, at least as regards the VCORE.

So this means for me, it's probably not a problem with the bios, but this is probably some hardware design flaw on the MSI B560 PRO, otherwise I can't explain to me how this is possible. I believe this migh have something to do with a probable small but different pinout of the 11-th gen CPU against the 10-th gen. CPU's. However I have no idea what this could be.

I found also one or two posts in the net reporting same issue with B560M PRO and i5-11600K, but no solution there.

I'm now out of ideas and I'd like to ask you for any hint what could be the reason and decisive difference between 10-gen and 11-gen CPU's or the both boards.

Did anybody of you encounter such a strange issue ?



Below the link to the schematics and boardviews of these boards, in the case somebody would like to investigate this.

https://www.badcaps.net/forum/troubl...-pro-e-ms-7d22

[DynaxSC]

The issue did make me somewhat crazy, so I looked into the boardviews of both boards, and I was really lucky to find a first major difference in the pinout of the LGA sockets on both boards.
The difference is on pins AV13 and AV27.

Pins AV13/AV27:
-----------------------------------------------
on MSI B560M PRO ------>>> VCCPLL_OC
on MSI B560M PRO-E --->>> VCC_DDR

The net VCCPLL_OC is completely non-present on MS-7D22 !
Didn't check more, so there might be more differences.

Below both BV's one by one - differences in pinout shown as the small red circles - same pin's - different nets, and both power nets :







I'm getting more and more confused, as MSI states as below that B560M PRO supports 11-th gen CPU's.
I'm more and more suspecting that this is an major error on the MSI site, and this board does not support 11-th gen CPU's at all.

Is MSI lying on their site ?
Did somebody just make copy-paste ?



https://www.msi.com/Motherboard/B560M-PRO/support#cpu

[haoran wang]

if MSI compatibility list show supported CPU ， should be works normal . never encounter your strange problem

[haoran wang]

7d22 also use for MSI B560M plus

[McKey]

Power planes can be different, especially if one of them can deliver OC currents. But as far as i know there are some negotiation on every intel board about the generation. Probably for power delivery reasons. So there could be a knocked off component or cut trace that are not effecting the 10th gen, but it is causing problems on the 11th gen.
I would double check the components visually and then with a multimeter, below the socket: