I am also on the heels of buying a 675xl, i had a chat with a tech the other day, but im not sure if he was looking for a sale. I appreciate if possible confirmation on it coming with 400mhz dual channel enabled out of the box. here is an excerpt :
rob: im curious about a few things on the 675 series
Raymon: OK
rob: wondering bus speed of memory, and if dual channel is enabled
Raymon: It is dual channel
Raymon: 400mhz
rob: how about the hard drives, the rotaional speeds on the x and xl
Raymon: 4200 and 5200
rob: thanks for your time

Raymon: