AX78 Ram Uprade

[Stuart1981]

Hi all, new here so bear with me,

I have purchased some more ram 2 x 2GB Ram matching the 2 x 2GB I have installed already equaling to 8GB, ram model and manufacturer = corsair CM2x2048-6400C5DHX. all 4 modules have same ratings, latency, voltage ect. I installed the 2 modules in the spare slots and booted pc.
well pc turns on but get error C.1. and no screen I took out old ram and put the 2 new in slots 3 and 4 and boots up perfect, is there a BIOS setting i need to change or something up with the other slots? the only difference i see on the modules is version numbers, everything else matches!
after a few tries here is my diagnoses -

seems slots 1 and 2 are not working (green) and 3 and 4 (orange) is working. have tried new modules in 3 and 4 and works 1 and 2 I get error C1.
Older modules work in 3 and 4 will try 1 and 2.

[csgohan4]

See if older modules work in 1 and 2 as you have stated. . Before the upgrade, were the old ones in Slots 3 and 4?.

If the old ones work in 1 and 2 try memtesting the new ones first 1 module at a time and the move to the old modules.

[Bambooz]

C1 is a "generic" memory error. Could be caused by just about anything. Bad RAM, dirty slot contacts (clean paintbrush usually helps) or in case of AMD based systems with their memory controllers in the CPU, bad or intermittant contact on the CPU socket (reseat?!). My IP35 Pro also had the C1 memory error a while back out of nowhere. I just left the BIOS battery out for ~20mins (actually forgot to put it back in and didn't fiddle with the board out of frustration) and it booted right up..

Gigabyte Boards from a couple years back (Socket 775 Core2 era) had similar problems with all RAM slots populated. On those, you had to raise the RAM voltage a bit (from the default 1.80V to 1.85-1.90V for DDR2) with just one or two RAM sticks, turn it off and then put all 4 sticks in. Worked most of the time.