Intel Core microprocessors

This T1300 and many other Core CPUs are packaged in 478-pin micro FC-PGA package. While older mobile microprocessors, including mobile Pentium 4-M, mobile Pentium 4, Celeron M and Pentium M, were also packaged in 478-pin package, it doesn't mean that all these processors are compatible with each other. In fact, there is a difference in location of one pin between Core Duo/Solo, Pentium M/Celeron M and Mobile Pentium 4/4-M packages. Even more confusing part is that all these processors use socket 479 (a socket with 479 pin-holes), that will accept any of these 478-pin packages. While all above-mentioned processors will fit in that socket, only one processor family will be electrically compatible with it. For these reasons Core Duo/Solo microprocessors cannot be used to upgrade Celeron M/Pentium M or Mobile Pentium 4 laptops.

First generation of Core microprocessors, officially released in January of 2006, used Front Side Bus frequency 667 MHz. In a month, in Februrary 2006, Intel quitely introduced OEM-only versions of Core microprocessors that had 533 MHz FSB. Core CPUs with 533 MHz FSB can be easily identified by their model number - all of them have "50" as the last two digits of their model number (e.g. T1350). Very limited information about these CPUs was posted on Intel's website.