MSI B450 motherboard will only take memory in slots A2 & B2

[zogthegreat]

Hi everyone!

 

So I have a "new" rig that has a MSI Tomahawk Max B450 with a Ryzen 7 3700X CPU. I'm using 2 new sticks of Corsair Vengeance RGB. The problem that I'm having is that the system won't POST with the memory in slots A1/B1, however, it will POST with the ram in B1/B2. 

 

To clarify, when I say the the system "won't POST", the system will power up and the lighting on the memory turns on, but it hangs there without the monitor coming on.

 

Am I doing something wrong or do I have a problem with the motherboard?

 

Thanks!

 

zog

[Helpful Tech Witch]

That board should have some sort of debug leds, what do they say on no boot.

[SamrasNeela]

Yo you should also use slot 2 and 4 for 2 ram sticks

[TukangUsapEmenq]

Page five, or more details on page 28, it's in the manual. https://download.msi.com/archive/mnu_exe/mb/E7C02v3.1.pdf

[zogthegreat]

@dhannemon13 Thanks, not sure how I missed that, kinda obvious when you take a second look.

 

Side question, does anyone know why MSI setup the memory on the board this way?

 

Thanks for the advice and (ahem) being gentle about RTFM!

[TukangUsapEmenq]

21 minutes ago, zogthegreat said:

@dhannemon13 Thanks, not sure how I missed that, kinda obvious when you take a second look.

 

Side question, does anyone know why MSI setup the memory on the board this way?

 

Thanks for the advice and (ahem) being gentle about RTFM!

Fun fact: I actually did stuck on why didn't my brother's B350M boot. Turns out, wrong slot. Put it on A1 and B1. 

 

Well, we really should RTFM for the things we curious into.

 

And, actually made me curious enough to searching about this. Good to know tho, never knew why we should either until I read this.

 

https://forums.tomshardware.com/threads/why-are-we-putting-ram-sticks-into-2nd-and-4th-slot-first.3195865/