Chip's power consumption is <6.6W/Ghs
ATX power loses(82%), DC/DC power loses(87%), Fan(5~20w), etc
So
Dear Dr. NGZHANG,
That's not the reason for you to claim the power consumption of the unit is 450w.
The power consumption of the unit is what all it matters. You picked on BFL for the same thing and now you talked like its all fine and dandy.
LOL at ... saying fans power and all that. Should I add the power I need to cool my room?
Actually, yes.
When summer comes around you will need it regardless of which vendor you go with. If you "need it" to run a Bitcoin mining operation then it should be included in the final calculations.