Fan-Activity: X31 with 1,70 GHZ vs. X31 with 1,40 GHZ

[canetti]

Helo,

I´m interesting for this Notebook:
ThinkPad X31 TK17UGE
http://www5.pc.ibm.com/de/products.nsf/ ... d+X+Series

This Notebook has a 1,70 GHZ Centrino Processor. A friend of me has a X31 with a 1,40 GHZ Centrino. The fan of his Notebook is very rarely active. This is my first priority!

My Question:
Is the fan of the X31 Notebook with a 1,70 GHZ Centrino more often active as a X31 with a 1,40 GHZ?
Or is the GHZ-Power independently of the fan-activity?

Greets
canetti