What is different between the processor?

Question

Intel Core Duo T2300 FBS 667, 1.66GHz, 2MB

Intel Core 2 Duo T500 FBS 667, 1.66GHz. 2MB

Answer 1

Compared to  Intel Core Duo (Yonah), Intel Core 2 Duo (Merom) has larger L2 cache, slightly deeper pipeline and added decode and execution units. In addition, Merom features more aggressive pre-fetch mechanisms than Yonah, as well as Intel's  Memory Disambiguation technology that allows for out-of-order loads. In other words, not only is Merom able to process more data at once, at a  faster speed, but it can also get access to that data quicker.

Overall, Merom may not be as big of an upgrade to Yonah as Conroe was to NetBurst, but the bottom line is that you get  equal or better performance in every test without increasing cost or decreasing  battery life.

Performance-wise, they're near identical for most applications.

Update:

Core 2 Duo also has 64-bit EM64T support (which Vista would take advantage of). The Core Duo does not...

While the differences aren't major, they aren't just related CPU & L2 Cache speeds.

Answer 2

There may have been some slight misprints wherever you found the information you had.  Really the only differences are the CPU & L2 Cache speed as can be seen below because the Bus/Core Ratio is a direct reflection of processor speed & power used (faster processor results in a higher ratio = lower battery life).  The following info is directly from Intel's website......

T5550 SPECIFICATIONS

CPU Speed: 1.83 GHz

FBS: 667 MHz

Bus/Core Ratio: 11

L2 Cache Size: 2 MB

L2 Cache Speed: 1.83 GHz

T2300 SPECIFICATIONS

CPU Speed: 1.66 GHz

FBS: 667 MHz

Bus/Core Ratio: 10

L2 Cache Size: 2 MB

L2 Cache Speed: 1.66 GHz