Difference between 1.8A and 1.8?

[Lonyo]

Title says most of it, is one northwood and one not? (ie: 512kb cache northwood, 256kb cache previous one)

 

[reelbigfish214]

The 1.8 can be socket 423 or socket 478 but has 256KB of cash and is the Willamette core. The 1.8A is socket 478 and a northwood core on the .13 micron process with 512KB of cache.