Because BFL is using a 65nm process and Tom is using 130nm? That's a 4x difference in power use right there.
Actually, I'm not sure what Tom is using. Maybe I'm thinking of Avalon. Anyone know for sure?
Tom is using 90nm and has further stated that the bASIC 1 will run on a barrel type connector or molex, this means under 110w.
https://www.bitcoinasic.net/index.php?route=product/product&product_id=51Given the complexities/risks associated with designing a 45 or even 65nm chip I think a 90nm ASIC was an excellent choice for a product introduction.