My latest board from Taiwan - 800,1066,1333,1600,1866,2000 and variations in-between depending on QPI settings. Official support is 800/1066 at this time, would not be surprised if the XE gets a 1333 blessing at some point. Everything else is "overclocking" in Intel's own terminology but it certainly does not mean that the boards cannot offer support above 1066. However, triple channel 1066 at 5-4-3-15 matches up very well with the XE.