This Xeon processor is on the parts compatible list. 2.4GHz, X3220, 2X4M, Intel Xeon Kentsfield -- Dell Part# HP110 Supported Systems The following systems have added the Intel quad-core processor to their configuration: • PowerEdge™ 840 • PowerEdge 860 • Dell Precision™ Workstation 390 To determine if a system is compatible with the quad-core processor, look for the new identifier added to the chassis, a roman numeral 2 in the upper right of the front bezel.  Second: The PE 840 does have supported drivers for Windows Server 2008 R2. www.dell.com/.../555
Hello, I have a Dell PowerEdge 840 with factory original components including Pentium D (3.0GHz) CPU, Perc5i RAID controller, and original SATA drives.  Question:  The factory options for this box included Xeon processors from the 3000 and 3200 series.  Can a straight chip swap be done on this system from its original Pentium D to one of the aforementioned Xeon chips?  (The Intel site indicates that the Pentium uses a PLGA775 socket while the Xeon uses an LGA775 socket.  Info I’ve seen elsewhere on the web suggeststhis is not an issue.)   Secondly:  Are there known significant issues running Windows Server 2008 R2 on the PowerEdge 840?   Thank You,
PowerEdge 840 Chip Swap 