Got PE1950 genII(s) for home lab vms, power saving?

I'm looking to run one PE1950 at a time (appears to be using 200w) with One Dual Core 3.0ghz xeon. 

However upon ESXi installation I've lost power management, without any VMachines loaded the fans are now going up and down. 

One system is fully up to date (with ESXi loaded)

The other isn't up to date, however even with full load the fans never really kicked up as the 2.3.7 bios/current firmware one does- so if I can't get power management I suppose I can swap to it since it runs at one fan speed pretty much.

In linux I had the processors going 3.0ghz -> 2.0ghz, that actually kept the server cooler then my i5 desktop. 


(I know I know, need to get replacement servers for these in a few months- I may buy one or two quad core power saving cpus to replace the current ones if anybody has suggestions)