Dual core and core 2 duo

[abbviper]

Hi i am looking at laptops and see Intel Pentium Dual Core Processor and then Intel Core 2 Duo Processors. Is there a difference? Which would be faster:

Intel Core 2 Duo Processor T5250
(1.50 GHz, 667 MHz FSB, 2 MB Cache) or Intel Pentium Dual Core Processor T2080 (1.73 GHz, 533 MHz FSB, 1 MB Cache)

 

[fobose]

I have the T2080 in my laptop, the T5250 would be better though. The difference is that the Intel "pentium dual core" is a 32bit CPU (AKA Yonah) where as the Core 2 Duo is a 64bit CPU.