Dell Optiplex 3420
4th gen i5-4570 @ 3.2 Ghz (quad core, non-HT)
12 GB RAM
SSD drives
Windows 10 Professional 64-bit
Dell Inspiron 17R
3rd gen i7-3612QM @ 2.1 Ghz (quad core, HT)
8 GB RAM
SSD Drives
Dual Boot Windows 10 Professional 64-bit on one SSD, Linux Mint 17.1 64-bit on another SSD
Obviously, any experimentation with Linux-based SDR software happens on the Inspiron laptop currently. I usually run Unitrunker and DSDPlus on the Optiplex to monitor various systems and digital signals.
I have various RTL sticks with various tuners in them, a Funcube, a Funcube Pro Plus, and an Airspy.