We had one of those [E12K] at the place I worked. It was so heavy our raised floors needed to be reinforced to hold it without the floor collapsing. Was an impressive beast.
E12 ! you mean a little one
The E25's we're even heavier.
The 12's weighed in at 1,982 lbs (899kg), the 25's broke a few floors at 2,514lbs (1,143kg) !!
And the big guys haven't got any lighter either.
The latest Oracle/Sun M6-32 weighs in at a whopping 3,697 lbs (1,677kg) ! as the biggest single unit they ship.