I'm looking at having a new HD editing workstation built.

Any thoughts on how much real-world difference I'd find between an i7 950 and an i7 975 extreme when, say, encoding H.264?

How reliable is overclocking? (The build quote was originally for an i7 860 overclocked to 3.66Ghz)

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::