Dell Inspiron 15 :: 5000 Series - Slow Performance / CPU Stuck At 0.75ghz

I've recently purchased an Inspiron 15 5000 series and have noticed that performance is unusually slow for the specs, especially since coming from an Asus G73JH that was about 4 years old.

I've noticed that in the Task Manager on Windows 8, that CPU usage never goes above 30% and although the CPU is listed as an i7-4510u @ 2.00ghz, the Speed on the Task Manager page generally sits at 0.75ghz and never goes above 0.79ghz (generally when it goes above 0.75ghz, it for a brief moment).

I've been Googling this problem for a little while now and the only person I've found with a successful solution to this problem was on a desktop and had to replace their CMOS battery. Considering I'm on a laptop, I'd imagine this would void my warranty somewhat ....

I've run the Dell Support program and all the tests pass. I've also installed all the drivers from the Dell site (including the BIOS update) and all my Windows Updates are up to date.