Proof the Quadro FX 570m is crippled on 14.1" T61p?

[leesiulung]

Is there any proof that the Quadro FX 570m on the T61p (14.1") only has 64bit memory bus?

I have search here and on Google, but only found post echoing the fact. There seems to be no proof.

MOD EDIT: Duplicate thread, another thread on same/similar topic has already been started by you.