Are you sure that the settings in your recording software are set to 60 FPS? And also, your CPU is very weak.
And entertain me, and try recording at 1080p on the main drive.
Recoring at 30fps, Lagarith Lossless, YV12
My primary Drive gets about 170/180 mb/s on dxtory
my secondary gets about 140/150
they are identical drives! Both are practically empty!