
The base chipset is the 5520, codenamed Tylersburg-36D. The differences are based on which stepping of the Intel 5520 Chipset (Intel I/O Hub) is present.
#Pc3 12800e vs pc3 10600e serial number#
You can even see on the silver outside serial number label where a version 2 Z400 will have "HP Z400 6-DIMM Workstation" at its bottom left corner. There are two versions of the Z400, and the later better version has 6 instead of 4 memory slots, and also has a later boot block date that you can easily confirm in BIOS (11/10/09). the later ones focus on the version 2 Z400 that both you and I have. The first reply gives you an old Z400 QuickSpecs that is very early, not a more recent one that covers your "version 2" Z400 workstation. So far we have had 100% success in the version 2 Z600 doing this, however. These same sticks also worked very well in the one Z620 version 1 workstation I tried them in. The Z600s have been working fine with these sticks for months now. No unusual high powered video cards, etc.

Each of these workstations has the latest BIOS and updates. So, I must raise the concern that it may not work for all version 2 Z600s also. It gives 5 beeps, pause, 5 beeps, and on. I HAVE ONE VERSION 2 Z400 FOR WORK THAT THIS WORKED FOR, BUT THE OTHER VERSION 2 Z400 I JUST TESTED HERE AT HOME DOES NOT ACCEPT THESE MEMORY STICKS. USE OF THE MEMORY BELOW HAS RELIABLY WORKED IN THE SIX VERSION 2 Z600s I HAVE DONE THIS WITH. UPDATE: THIS IS PART OF THE PROBLEM WITH DOING "UNSUPPORTED" THINGS WITH THE HP WORKSTATIONS.
