Built my first PC today. Had some panic moments when I couldn't get the 20+4 PIN connector into my mobo and I freaked out over every little thing. Got some bruised fingers and some tired eyes but I did it. Haven't installed Windows yet but the BIOS is up and everything looks installed properly.
Only little thing I noticed is the CPU is turboing up to 3.9Ghz in the BIOS, shouldn't it not be doing that? What's up with it?
Thanks to everyone in this thread for giving me the belief to build. This thread is one of my favourites on GAF. You're all awesome.
Now I have 20 years of PC gaming to catch up on, a new control scheme to learn... can't wait!
Grats! We've all been there and it's a great feeling when it all finally comes together. Watch out though -- once you get the system building bug it never goes away.
EDIT: As for the mystery overclocking, chances are the turbo settings came pre-set on the motherboard from the manufacturer. Just keep an eye on the temperature (I highly recommend downloading Speccy) and you should be okay. If temp starts to creep up, install more fans in the case if possible.