Blizzard 1260 and 1240 pcb boards are the same !
On my 1240 it's written Phase 5 Blizzard 1260 .
You can upgrade from a 040 to 060 by changing a few parts and jumpers on the board.
Logic doesn't have anything to do with Vcore of the cpu but voltage regulator has ! :-)
Follow this link :
http://obligement.free.fr/articles/blizzard040060.php
