B Memory Channel doesn't work in Asus Prime X570-P

[MXTanooki]

I recently upgraded to Ryzen 5 3600X and while I was installing my old 2133MHz RAM I noticed that the B channel didn't work so I had to put up with it running in single channel. I brushed it off as it just being a Ryzen thing and ordered a set of 2x8GB Corsair CMK16GX4M2B3200C16 (3200MHz 16-18-18-18-36 1.35v) which arrived today. When I went to install them I noticed that my system still didn't post with them in the dual channel position and they're currently in single channel (A).

 

Specs:

• Ryzen 5 3600X
• 2x8GB CMK16GX4M2B3200C16 (3200MHz 16-18-18-18-36 1.35v)
• RX 580 8GB
• CX750M PSU
• Asus Prime X570-P

Things I tried:

• Trying every stick in every slot; both sticks work but only in the A channel.
• Trying both sticks in every possible combination; only both of them in the A channel worked.

Extra info that might help:

• The motherboard has 2 12V CPU power connectors, one for a 4+4 cable and another 4. I currently only have one cable for the 4+4 connector, maybe the other connector provides extra power for those things?

 

Another thing I want to ask is, does it really matter that much? I live in Mexico and having to return things in here is way too much work so if the real world performance difference isn't that drastic it might not be that big of a deal.

[Jurrunio]

1 minute ago, MXTanooki said:

maybe the other connector provides extra power for those things?

no, electrically all the 12v wires from both connectors are connected in parallel, you dont need the extra 4.

 

Check for bent pins on the CPU, otherwise either the board or the CPU's bad.

[MXTanooki]

8 minutes ago, Jurrunio said:

no, electrically all the 12v wires from both connectors are connected in parallel, you dont need the extra 4.

 

Check for bent pins on the CPU, otherwise either the board or the CPU's bad.

In case I find a bent pin what should I do?

[MXTanooki]

bump

[Kilrah]

It would depend on how badly it is bent, so check first.

[Mathieu9836]

Do you reset CMOS each time you change something on the board?

Also try to update BIOS with the latest one.

[MXTanooki]

Update: Just reinstalled the CPU, no bent pins, everything was fine, just a little extra thermal paste that had made its way to the motherboard. Cleaned everything up but it didn't do anything to help with the RAM problem. I did take out the battery while doing all this so the CMOS did reset. BIOS is the latest version already. Might have to just return both CPU and MoBo since I can't identify which one is the faulty one.

[MXTanooki]

6 minutes ago, MXTanooki said:

Update: Just reinstalled the CPU, no bent pins, everything was fine, just a little extra thermal paste that had made its way to the motherboard. Cleaned everything up but it didn't do anything to help with the RAM problem. I did take out the battery while doing all this so the CMOS did reset. BIOS is the latest version already. Might have to just return both CPU and MoBo since I can't identify which one is the faulty one.

just to clarify, the extra thermal paste wasn't in the socket.

[Zoltan2822]

Googled this thread. Had exact same issue today with Ryzen 3600x and Asus Prime X570-P

 

Solved it by BIOS (v1405) update!

[NicNash]

I'm on v1405, tuf gaming x570-plus wifi and unfortunately, it still fails for me in b slot

[Finessed]

On 10/25/2019 at 10:06 AM, MXTanooki said:

just to clarify, the extra thermal paste wasn't in the socket.

Did you ever fix your problem? I'm having the same exact problem with your exact specs right now. I am ordering a new x570p, but I don't know if that will fix it.