yes they are. like I said, the current AM2 CPU's still have bugs in them.
the memory controllers they have now are adapted from the DDR memory controllers, so they don't really agree with the DDR2 speeds.
not because they can't handle the speeds, but because they are are kinda out of sync with the numbers, like 333MHZ etc, where DDR1 memory controllers use speeds like 200MHZ (a nice round number)