Nice to see another MicroServer owner!
In case you hadn't seen all the discussion on forums.overclockers.com.au , there are some sets of RAM that work in the MicroServer until you either reboot or power off and re-power (I can't remember which).
I suggest you do a few (5-10) cycles of soft rebooting and hard power cycling and each time check that the BIOS sees all 16GB. As you're only booting in to the BIOS, it shouldn't take long.
There are reports that Patriot RAM works, and I think one or two other types, but most 8GB DIMMs do not work -- the HP Microserver doesn't officially support 16GB.
Cheers,
Neil.
Good info..
I Have been pretty successful with 2x Samsung 8GiB ECC Unbufferd UDIMMs... but i have not powered it on and off more then a dozen times since I installed it.
Ok, about the same as 14-15" laptop. thanks for the info. that should work... I'll probably get one when I get back stateside.