Can almost guarantee that your problem is your FSB - Quad cores simply don't like high FSB's, and even getting past 450 can be a real chore. If you're actually fully-stable at 466, give yourself a pat on the back.
One of the going gripes about the new 45nm processors are their lower multipliers, which is making it harder to get the really nice overclocks. A Vcore of 1.26 is nothing to worry about, as long as your loaded temps are staying below 65 degrees C, which shouldn't be too hard with a decent cooler.
i7 2600K | ASUS Maximus IV GENE-Z | 580GTX | Corsair DDR3-2133