I've got two ML 350 G5s, how do I know what max quadcore to upgrade to?

[JediFonger]

ML350 G5 P/N 419521-005 

ML350 G5 P/N 470064-837 

i have both of those and it appears as though 419521-005's max is Xeon 53xx series quadcore processors and 470064-837 can take Xeon 54xx.

i know that ML350 G5s lasted through multiple generations of Xeon.

how can i tell for sure which max quadcore i can use with which one?

it appears both have 5000z chipsets

[JediFonger · Accepted solution]

using the latest 2015 D21 FW, I have installed dual X5460 on both of the PN# up above successfully and also running 32GB of RAM

FYI for future readers.