I5 750 oc guidance

In early 2010 I built a new rig. It's done me pretty well so far, but I'd like to do a little OCing to try and extend it's greatness a little longer.

Here's the core components of my rig:

CPU: intel i5 750 http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MOBO: ASUS P7P55D-E Pro http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MEMORY: G.Skill Ripjaw 4 gb (2x2GB) 240-pin DDR3 SDRAM DDR3 1333(PC3 10666) http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU: Thermaltake model TR2 RX-850AH3CH http://www.plugloadsolutions.com/psu_reports/THERMALTAK...

GPU: Sapphire Radeon HD5850 http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Looking for 2 opinions:

1) what basic changes to BIOS could I do to OC my CPU?

Some sites I've read (http://www.legionhardware.com/articles_pages/intel_core...) seem to suggest that I need to OC my RAM to be able to OC my CPU and I'm not really sure my RAM can go beyond 1333.

2) What kind of cheap hardware changes could I make so I can OC my CPU? (At least from 2.66 to like ~3.6ghz)

I realize my PSU is 850w so I imagine that should have plenty of juice to do any voltage OC, but I feel like my RAM may possibly be bottle necking my CPU OCing ability? I've seen OC builds putting the i5 at 4.2 ghz, but the ram is always clocked to 1600 or higher. Is my 1333 ram keeping me down?

Mainly, I'm trying to optimize my experience in Skyrim. I read the game is optimized for single core CPU's, not quad cores liked mine, so overall clock speed is actually more important for performance than number of cores. Just trying to bump that number a safe, but more powerful amount, like +1ghz or something.

Kinda new to this whole OCing thing. I built my comp myself and I am comfortable with BIOS to some degree, but details would be greatly appreciated.

Thank you!