Solved: HP Compaq Elite 8100 SFF 16GB Memory Upgrade - HP Support Community - 7329994
HP Compaq 8100 Elite CMT Intel Core i5-650 3.20GHz CPU 4GB RAM No HDD
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC DIMM Memory Ram Upgrade Compatible with HP/Compaq® Compaq 8100 Elite Small Form Factor Business Pc - A69 at Amazon.com