I currently have a windows 10 PC. Running 32 bit KSP and It gets super low frame rates while flying but runs perfectly in the SPH or VAB. There is low gpu usage while flying idling at 300mhz and drops to zero usage while flying. I have just upgraded my GPU from a R7 260X to a R9 380X and the card is good. It runs any other game I throw at it with no problems. This is the Steam version of the game it is a fresh install.
PC specs:
FX-8350 @ 4.2ghz
16 gb of ram
R9 380X
copy of output log: