Faulty RAM Slots on MoBo?

[KukKaBubBa]

Hi, I have assembled the following PC:

MoBo ASUS TUF GAMING X670E-PLUS,

RAM G.Skill Flare X5 DDR5 64GB (2x16) 6000MHz CL36,

CPU Ryzen 7 7700X 4,5GHz +Cooler be quiet! Dark Rock Pro 4 135mm

PSU Be Quiet Pure Power 12M 750W

After some BSOD at windows login screen i started testing components to find the problem.

I loaded BIOS Default and tested 1 single stick from this kit F5-6000J3636F16GX2-FX5 (G.Skill Flare x5 EXPO)

in slot dimmA2 (grey) according to manual and it passed 10 cylces of memtest86 without any error

So I tested 2 sticks in slot Dimm.A2 Dimm.B2 (grey) and also got 10 cycles of memtest86 flawless

I cleared CMOS and tried to test other MoBo slots putting 1 stick in slot Dimm.A1 but the pc won't post 

and yellow led of ram i light-up steady.

I cleared CMOS and put the stick in slot Dimm.B1 and had the same problem

I cleared CMS and put RAM sticks in slots Dimm.A1 and Dimm.B1 and had the same problem.

Are those black slots of my MoBo broken?

[KukKaBubBa]

Maybe I understood...

I ran the following tests:

1 stick in A2 = OK post, ok memtest86
1 stick in B2 = Ok post, ok memtest86
1 stick in A2 and 1 stick in B2 = ok post, ok memtest86

1 stick in A1 = No post, yellow LED on steady
1 stick in B1 = No post, yellow LED on steady
1 Stick in A1 and 1 Stick in B1 = No post, yellow LED on steady

1 Stick in A1 and 1 Stick in A2 = Ok post, memory at 3600MT/s single channel, memtest ok

now I'll try to do a test with A2 and B1

but it seems to me that if you don't put at least 1 stick in the gray slots the mobo (A2 or B2)system will not post!

am I right?

[Nate152]

Hello KukKaBubBa

The correct configuration for two sticks of memory is slots A2 - B2.

Looks like all is well with your testing in the A2-B2 slots.

[KukKaBubBa]

I got it but I suffered a lot to test also slots A1 and B1 to be sure that my mobo was not faulty

I suggest to specify in user manuals that to test slots A1 and B1 it must be populated at first Slot A2

So to test those slots correct config is single channel A2+A1 or A2+B1

[BitingChaos · Accepted solution]

It's a standard RAM Daisy Chain design (and nothing to do with ASUS, as motherboards from other manufacturers work the same way). The electrical trace ends on A2 and B2, so something must be connected in those slots before the system can read A1 and B1.

The only "issue" is a cosmetic one; the Primary slots are called "2" and the Secondary slots are called "1".

My system won't boot when using just A1 and B1. There is nothing wrong with your board.

[KukKaBubBa]

Thanks a lot, my suroprise is nobody here or elsewhere is aware of this?

many people keep saying "test all the slots using 1 single memory stick and put it in one slot at a time"

but this solution is impossible to test.

So I had to try all te combination possible before realizing that A2 and B2 are mandatory to test A1 and B1.

Thanks for your support!

Best regards

[Silent_Scone]

Hi @KukKaBubBa 

To be fair, it is in the manual. A lot of users don't think to check. 👍

[KukKaBubBa]

I am sorry but it is not in the manual.

the manual suggests only A2, A2+B2 and A1+A2+B1+B2

in which section of Asus TUF X670E plus manual it is written that single channel config A1+A2 and B1+B2 are valid config to test A1 and B1 slot?

[Silent_Scone]

Well, the principle of running a single channel on that platform is kind of moot. Only for testing purposes, in which case it's A2, as per the manual. If you go against the instructions entirely, you can't be too surprised at negative results...

[KukKaBubBa]

the testing purpose is a must when a new pc blow away a CPU and RAM

I think it is normal to investigate if the all the ram slot on the mobo are working properly

and the manual do not provide any help with that.