Me here, the noob.
Well I got my 700 watt PSU and 7870 installed (that video card was rediculously big), and got up an gaming. Maxed out Just Cause 2 at 1080p and that is a glorious looking game. However, tried the same with Sleeping Dogs and I was disappointed, it was middling around 40fps even though benchmarks have it well above 60 fps.
Is this likely a HDD issue or CPU issue?