07-27-2015, 08:41 PM
In general (since the sensor specifics are lacking) Pentium D is slower than Core2 duo, its successor.. It uses a lot more energy (produces also a lot more heat). Core 2 duo is 64 bit architecture though. Core duo was 32 bits. My ageing iMac 17" 2GHz Core 2 Duo runs 64bits Mac OS 10.7.5 just fine.
There should not be a reason for your desktop to be able to run 64 bit OS-es and your laptop not?
There should not be a reason for your desktop to be able to run 64 bit OS-es and your laptop not?