I have HP XW8400 system, two DC Xeon's 3.0Ghz. Systemboard (by HP documentation) supports QC Xeon 5300 series. Now question - i bought pair of Xeon QC, but - one is SLAEJ, other SLAC5, both E5345, same speed, same cache size.Difference - CPU ID and CORE STEPPING.
Here the links for each CPU -
Please advice - can i use this pair on my system.