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Z790 MAXIMUS HERO + DDR5 CORSAIR : Only one DIMM working... - Q code 55

Level 7
Hi !

New built :
13th Gen Intel(R) Core(TM) i9-13900K 3.00 GHz
Windows 11 Pro - 22H2 - 22621.900
ASUS ROG MAXIMUS Z790 HERO - Bios 0803 !
CORSAIR DDR5 - CMT32GX5M2X7200C34 - SK Hynix (x4!)

Problem :
ONLY ONE DIMM work (in B2 first !)
-i mean : all of my 4 rams works, but only ALONE AND place in B2 first...
If 2 rams, 4 rams : Q-code 55... If on ram in A2first same... (or loop, but rare)
(-Q-code55 = no bios access)

All uptates done... even bios in beta...
XMP I or II or auto... the same

Pins are ok
Cleaning DIMM with isopropanol
Clear CMOS (>30s)

Any idea ? Or send my motherboard back ?


Level 13
1. Your ram kit of 32GB came from 8GBX4 in a set of single package or 8X2 in a pair x 2 separate set.
2. If come from 8GB x 2 in a pair. Insert the same pair with the serial came with running serial number in A2 and B2 slot of ram and test it out.
Let us know your result.

16gx4 in factÂ*
2 series which i respect on the order Â*
And remember : A2first don’t work with an only ramm… but b2 first work…
(All ram work if i put in B2first one after one…)Â*

Level 10