X7DBE 32GB not recognized

hi guys,

i installed 32gb (8x4 of the same memoryunits), but the bios (2.1a newest) ony shows 16gb

what could be the problem. i read about memory interleaving in the bios, but i didnt find any information ;/

thanks in advance
duderion

Check the motherboard's manual, the chipset might not support over 16Gb RAM. I currently have 4gb in my board, I can have 8gb, but my chipset supports 16gb. My friend has 8gb in his, he can go to 16gb, but the chipset supports 12gb.

In short, maybe your board has a restriction on the maximum supported RAM. Also, it could be a maximum amount of banks that it supports, ie: If you have 4x 2 sided sticks (8 banks), and your board supports a total of 4 banks, then your other 4 banks are useless and you can't utilize those.

Are all of your memory stick registered ECC-RAM?

X7DBE http://www.supermicro.com/products [...] /X7DBE.cfm

"The X7DB8/X7DBE supports up to 16 GB (32 GB) fully buffered (FBD) ECC DDR2 533/667 in 8 DIMMs. Populating DIMM modules with pairs of memory modules of the same size and same type will result in Interleaved Memory which will increase memory performance."

Q - are the sticks ALL the same Mfg, Speed 533 MHz and 667MHz, Freq, Fully Buffered ECC, etc...? If not then note the 16GB above

Q - How many and what Xeon are installed?

they are fully buffered and 533mhz

If using interleaved memory with 8 DIMMs, you need to install it as such:

1A
1B
2A
2B
3A
3B
4A
4B

Once completed, the system will recognize the full 32GB.