Whoa - I'd completely trash that whole build. You're paying way too much for a motherboard and pairing it with a CPU that will completely bottleneck the system. If you're going to cut corners the CPU is not the place to do it. The PSU is from one of the absolute *WORST* vendors in the industry and 1KW is way overkill.
Yep, same opinion as G.Skill. You have got an overkill case and motherboard with a fairly top end GPU , paired with a dirt cheap Pentium processor.
Where did you hear that Dual cores are better for gaming? That may have been true 6 years ago when Dual cores were just beginning to enter the market and were phasing out Single cores. Nowadays a Quad core is standard with some higher end Intel chips getting 6. AMD has even released a CPU's with 8 cores (admittedly they aren't true "Cores", but still).
They are ridiculously, blazingly faster.
Heres a video that will show you the difference. Also its a bit old now, so SSD's have gotten even faster and much cheaper. 128GB of premium SSD is ~$100. http://www.youtube.com/watch?v=-lR0XoHFU6Y