I think I fixed it. I had to go into the BIOS and do battle. Really, I did a couple of things (turned off C-State in addition to...), there was an 'automatic' setup for performance under 'Power Management' where I had to set it to manual to change the settings of the three fields to "High Performance". This document has some additional settings info on Page 22. [URL]  
My R610 server with processor base speed at 2.93 GHz, Windows 10 shows in the Task Manager Performance tab that the system is only running at about 1.58 GHz. I need the cpu's to run at their highest speed always. Why would this be? Is there a setting in the BIOS that would cause this? As I recall the bios settings are for Turbo, and high performance. I will have to track down a monitor to check that. Anything else to look for? Any documentation on cpu speed adjustment? Thanks.
Dell R610 2 cpu @2.93 GHz only running at 1.56GHz