Best I've gotten in New Haven, CT is 4.3 Mbps but it depends on the quality of the signal.
While this is much below the theoretical upper limit for 4G type networks (4G - Wikipedia, the free encyclopedia) it is pretty good for real world speeds (see here: 4G Wireless Speed Tests: Which Is Really the Fastest? | PCWorld).
The unlocked international version of the Note will be limited to ATT's HSPA+ version of 4G, NOT compatible with the LTE version of 4G they are rolling out now. 4-6M downloads is typical of hspa+ and is the best you will get with the unlocked international ver on ATT.
