ML350G6 CPU upgrades

HI all,

I've got an ML350G6 configured with an E5504 CPU, which was bought a couple years ago, running as a generic Linux server. As the box starts to show its age, I'm thinking about a CPU upgrade. Having read a couple forums (including this one), it seems that some mainboards support 55xx CPUs only, some support 55xx/56xx.

http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/ML350-G6-upgrading-CPU-to-5600-series/td-p/5855237#.VK73RiuG9VI

"System board Part# 511775-001 for systems using Intel 5500 series processors
System board Part# 606019-001 for systems using Intel 5500 and 5600 series processors"

Is it possible to tell from the SKU retrieved via dmidecode that which board does it have? The only partnumber I was able to retrieve is 470065-114.

Thanks,

Zoltan H