Hello Netwise Yes, the E/X/L does matter when checking compatibility. Yes, the L5335's should work. Here is a list of compatible 53xx processors for the 2950 II: Xeon X5365 Xeon X5355 Xeon E5345 Xeon E5335 Xeon E5320 Xeon E5310 Xeon L5335 Xeon L5320 Xeon L5310 Thanks
I have a couple of PowerEdge 2950 Gen II systems (System Board CU542).  I understand that this will work with 51xx and 53xx Quad Core CPU's.  What I am not certain of, is it matters if it is an E/X/L.  I'd prefer to pick up some L5335's for the power savings, but need to be sure they work fine.  Also do I need the GF449 heat sinks, or would heat sinks from a PE2850 work just as well?  They appear to be largely similar in surface area, mounting and total volume, but I suspect there is some reason they're not compatible. Thanks in advance.....
PE2950 II CPU Options