Hi [NAME] - Not sure where 16GB max RAM came from.  Per spec sheet (attached below) max is 48GB with 1 CPU and 72GB with 2 CPU's. Hi [NAME] - I attached service manual below with RAM tables.  What brand RAM is being tried?  KVR (Kingston Value RAM) can be hit or miss in Dell's. I'm also with JOcean on replacing the size 2032 CMOS battery.  Bad batteries can cause erroneous problems. Tech Guide also thrown in.
Hi, I have an old 2009 Precision T5500 that I haven't used for a while but when turning on would either crash after a while or report diagnostic codes 3 and 4 (Memory subsystem configuration activity or failure).  I swapped the existing memory in and out with no luck.  So I brought 4 new Dimms, ddr3 4Gb each PC3-10600u and I still get codes 3 and 4.but all the time now.  Any ideas?  Thanks.
Memory issues