Iglesias :
Right now, I have my i7 3770k overclocked to 4.4GHz.
I see on CPUID that the CoreVID hits <1.27 when it's at 4.4GHz.
Do I still have room to go one more?
When I was at 4.3GHz, temps were below 45..
yeah, you've still got a small headroom (1.35V is the max voltage for 24/7 usage in my opinion) so you can get 4.6 easily with that voltage and maybe 4.7-4.8ghz out of that if you have a good chip...
Make sure you're always keeping temps under 80C in full load (stress test like aida64 and/or prime 95)