HD or GPU responsible for slowdown?

[natnint4000]

I tried a very recent version of dolphin in this case dolphin-master-4.0-3239-x64 and put in on my desktop pc which has the following specs

CPU; intel core 3570 non k version (turbos up to 3.8ghz)
HD: 1TB WD WD10EZRX Green, 3.5" HDD, SATA III – 6Gb
GPU: AMD Radeon HD 6670 4GB
RAM: 4GB

OS: Windows 8.1 64-bit

And WWE 13 runs practically full speed with very few dips in performance, I try the same thing on my laptop specs are in my sig except for the following;

1TB WD WD10JPVX Blue 2.5", 9.5mm, SATA III-6Gb/s, 8MB, 5400rpm

And WWE 13 runs full speed but with more FPS drops and slowdowns

The Laptops graphic card has been set to full performance and high performance in the control panel and i chose the 760m GPU for dolphin and to reduce overheating I down-clocked the 4900mq to 3.2ghz for all cores which still benchmarks faster than the 3570 when I tested them both via the dolphin benchmark. The GTX 760M gpu AFAIK is better then that hd 6670 used in the desktop. Any idea what could be making the laptop slower for this game?

For reference here is my settings I used for throttlestop which i used to down-clock the CPU: