Born in 1942, I am retired from engineering and software development. I am a widower and grandfather with five (5) adult children.
I built 20 fast computers contributing to the World Community Grid (WCG) 24 hours/day 7 days/week usually ranking me (FrancisNH) among the top 50 daily contributors to WCG. I am slightly addicted to watching the BOINC scoring. Nineteen (19) of 20 (20) computers are Ubuntu linux machines which saved a lot of Windows licensing cost. Running Nvidia GPU's is easier now using Ubuntu 16.04. Use Synaptic to search Nvidia, then install the Boinc-Nvidia-Cuda-Client.
I contribute to MilkyWay@home because of my interest in astronomy and because the MilkyWay project uses the GPU while allowing most of the CPU capacity to continue serving my original WCG choice. Nvidia Titan Z, Titan Black, and Titan GPU's are doing MilkyWay@home work because 1/3rd of the CUDA cores have the double precision floating point (FP64) required by MilkyWay@home. Unfortunately, Nvidia reduced the FP64 ratio from 1/3 to 1/32 of the CUDA cores on the more recent GTX 9XX and 10XX series.. I have given away the power hungry GTX 980's, 970, and 960 replacing them with six (6) energy efficient GTX 1060's. One GTX 1060 production equals a GTX 980 at half the power draw.
In 2018, seven (7) of my computers are Intel i7-4790K, nine (9) are AMD Ryzen 7's, four (4) are AMD Ryzen Threadrippers. Total CPU cores are 312. WCG measures 300 days per day compute time. The difference (312 - 300) are 12 CPU cores used up supporting the nine (9) GPU's.
The cost of electricity and cooling requires that I curb my enthusiasm by limiting any more expansion. Total power draw for the 20 machines is 4,352 watts or US$318/month.
In addition to Grid computing, I am a Radio Control flyer using the 3DR Pixhawk autopilot to fly my airplane. Seen in the photo, it weighs 18.5 lbs, 9' wingspan, lands at 28 mph, and cruises at 45 - 60 mph. Engine power is converted from the original internal combustion (twin 60's) to electric motors. It has lots of thrust and will fly for 15 minutes.