I got my MSI GTX260 in from Newegg the other day.
It wasn't shown on newegg, or MSI's web sites, but the card is an OC version and comes clocked at 620 core, 1296 shader, and 1080 memory, by default.
The stock Extra voltage is also 1.06v, leaving a good bit of voltage headroom through BIOS mods (the voltage being adjustable to 1.18v in the BIOS).
I haven't had a chance to do any real testing yet; I'm the process of overhauling the cooling for my card. I've decided to stick with the stock cooling, but all
thermal interface materials are being replaced. I've de-lidded my card and will likely use Liquid Pro liquid metal as the TIM between the die and the heatspreader, and possibly between the heatspreader and the heatsink. I've also ordered three difference kinds of gap filler to replace the mesh reinforced paste/pads that connect the memory and the VRMs to the heatsink. I may also have some even better gap filler samples on the way, but not sure if I'll get them in time.
Anyway, I'm going to shoot for at least 700 on the core, and depending on temps I may even try for 800, but with that clock speed and the 1.12 to 1.18v, I doubt the stock cooler will handle it, even at 100% fan speed, overhauled TIMs, and improved case cooling.