Excellent explanation, thank you.
I've heard that these demanding drivers only uses 3 cores/threads from the CPU, why don't split the load with the fourth? it would really help mid-level CPU like mine.
And your CPU is a freakin monster really, not only has 2 more cores but has 100 points more than mine on SingleThreadRating.
PC: Core i5 4460 3.2Ghz, 8GB DDr3, Intel HD 4600