Problems with LAN box

Michelvw

Honorable
Oct 12, 2015
11
0
10,510
Hello all,

Been building quit a lot of PC's in my day, but this one baffles me.
So I'm making a portable LAN box, a custom built all in one PC if you will.

I've bought all sorts of second hand parts, put em together, works.
Now my problem is that I have 2 sticks of 4gb ram, but only one is detected.
I can swap places of the stick, still only 4GB
I can put either stick alone in one of either 2 ram slots, still 4GB detected.
I've updated the BIOS, no avail.
I'v reseated the CPU, no avail.

So the sticks themselves should be fine.
Both memory banks on the mobo should be fine.
What gives?

Here's a list of the hardware:
i5 2400
P8H61-M LX3 PLUS
2 x 4GB low profile ram KVR1333D3N9K2/4G
128GB SSD
W10 64bit
R9 270X connected with a PCI riser (could this be the culprit somehow?)
Tacens 500Watt PSU

Ideas are very much welcome