.... my older RAM inside with it (G.Skill DDR3-1600-PC3-12800 2GBx3 CL9-9-9-24 1.5v). The only thing different between the two are the CL rating (10-10-10-30) ....edit
: I just remembered, the memory controller on the 1366 CPU's doesn't recognize 8Gb sticks
. The most you can have is 24Gb
in a 6 x 4Gb arrangement.
This assumes they are the same voltage and 1,600MHz speed. Or you can buy these
and forgo the gymnastics though I'd still make sure the BIOS is updated to F13 before the addition.
1. Update the BIOS
to the last version available for your MB if not already up to date.
2. Then install the slower 3 x 4Gb in the A channel and the faster 3 x 2Gb in the B channel. You will have to look in your MB manual for which configuration(s) are acceptable for a 1+ 1 + 1 x 1 + 1+ 1 triple channel arrangement on a six RAM slot 1366 MB and which channel is the first channel?
You can buy a 2 x 4Gb + an identical 4Gb stick or three (or six) of the same 4Gb sticks
(probably easier). It matters not.
3. If it still won't stably boot. Remove the 3 x 2Gb and boot into the BIOS menu and manually change timings to 1,600 (10-10-10-30), save and exit. Shutdown, install other RAM in B channel and reboot.
4. If it still won't work, I'd repeat step 2, do a CMOS reset per MB manual and then step 3.