Centrino Duo or pentium M , which one is a 64 bit processor?

Answer 1

Centrino Duo is a 64 bit processor

Revolutionary mobile performance
Intel® Core™2 Duo processor engine
World's best mobile processor, based on Intel's revolutionary Intel® Core™ microarchitecture, optimizing performance and power savings³
Intel® Advanced Smart Cache
With up to 4 MB L2 shared cache compared to 2 MB L2 on the Intel Core Duo processor, the Intel Core 2 Duo processor offers even more efficient data sharing, providing enhanced performance, responsiveness and power savings. The shared cache adapts to mismatched loads on each core. When one core has minimal cache requirements, the other core can increase its percentage of L2 cache, thereby reducing cache misses
Intel® Wide Dynamic Execution
Improves performance and efficiency as each core can complete up to four full instructions simultaneously using an efficient 14-stage pipeline
Intel® Smart Memory Access
Improves system performance by hiding memory latency and thus optimizing the use of available computer data bandwidth to provide data to the processor when and where it is needed
Power-Optimized 667 MHz Front Side Bus
Provides increased data bus bandwidth, vs. prior generations, for faster data transfer to help meet the needs for demanding applications
Intel® 64
An enabling technology that can take advantage of 64-bit applications and the Microsoft Vista* OS as they become available

Answer 2

the duo