My calculation is wrong, cause I used empower spell instead of enhance spell, halving the benefits.
My mistake, sorry!
However, from the D&D FAQ (last release 08/13/02, page 18)
So, the spell should be:
120 (base intensified)
30d6 (3 x empower)
10d6 energy admixture
120 + 40d6, average 260...