What does it matter? I have had a GTX 460 1GB from the week the cards were released. Mine is clocked at 840-1680-2000 and has been a very good card.
I am at the upgrade point now though and have just been waiting on the GTX 6xx series to see how good they are. If they turn out to be really good I will pick up a GTX660 or 660 Ti. If not then the price has really come down on the GTX 570. Hell GTX 480s have been on sale for $200 on newegg lately.
If you are getting 940Mhz clock out of a GTX 460 it probably is close to a stock GTX 560 Ti. The 560 will still overclock though.