HP DL160 G6 memory PC3-10600R vs PC3-10600E

I am using a HP DL 160 G6 server that according to specs takes PC3 Registered or Unbuffered. When I combine the two types of memory below the system will not POST. When I use just the first type of memory listed the system will POST.

I have two pieces of HP memory that came with the server labeled

PC3-10600E-9-10-E0

and then I have some Crucial memory labeled

PC3-10600R-9-10-B0

I wager that the R means Registered memory and the E means ECC - then shouldn't the crucial memory boot with the system according to the HP specs? Or does the E mean it is Unbuffered and therefore I shouldn't mix and match as according to this HP memory config doc?

Solution 1:

The difference between the RAM modules you have is UDIMM (unbuffered) versus RDIMM memory; unregistered versus registered. They cannot be mixed in the same server. So you are correct, the memory guide states not to mix the two. http://h18000.www1.hp.com/products/quickspecs/13344_na/13344_na.HTML#Memory

Do not mix Unbuffered memory (UDIMMs) with Registered memory (RDIMMs).