Originally Posted by
boxinbull
Does the 2.2 model use all 4gb unlike the 2.16?
The newest ones use all 4GB, as in the ones they've been selling for the last few months at least. That would be the current 2.2 and 2.4GHz models (and the new 2.6GHz option). That may have been the first revision that was able to use all 4GB, but I'm not 100% sure about that part. I just know that the current ones can address all 4GB.
It's possible there is a previous 2.2GHz model that can't do it. I didn't look up all the previous speeds and stuff. It's a revision of the Intel chipset used that is responsible for the change.