The documentation DOES SPECIFY Power supply is NOT ATX its PFC EPS 12v 80 percent efficient. EVGA 700BR would be recommended replacement for Tower Version. [URL]     Intel® Xeon® Processor E3-1200v2 Family; 3rd generation Intel® Core™ i7 and i5; 2nd generation Intel Core i3; Turbo Boost Technology 2.05 and Intel Integrated HD Graphics on select processors; optional Intel vPro™ technology Dell only supports the processor it ships with. No other upgrade or warranty is expressed or implied nor is any fitness for a particular service. [URL]  
I have a T1650 Precision workstation. I am trying to upgrade the processor. However, the information given online does not specify what processors this unit supports. Can anyone advise what they support? Also, for power supplies in these models, are they keyed differently or can I use a basic ATX power supply off the shelf? I am planning on adding an upgraded video card, additional drive and ssd so I am sure I would benefit from additional clean power.  Thanks in advance.
T1650 processor upgrades and power supply information