You might be on a small overclock on your platform. List your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Intel Core i5 3470 3.2ghz
Gigabyte Z68-DS3
2TB HDD
R9 280X
I dont see the relevancy of other components other than mobo and cpu, i did not overclock the cpu. Base clock for the cpu is 3.2 which it is, but the boost clock should be 3.6 acording to intel website but taskmanager shows the speed is nearly at 4ghz (3.96ghz)