Chips with 6 MB L2-Cache follow the nomenclature x9xxx and those with 3 MB L2 cache are called x8xxx. The L2 cache capacity determines whether there is an '8' or a '9' at the beginning of the model number. The P models are especially appropriate for compact notebooks, e.g., subnotebooks, or especially slim notebooks with limited cooling capacities.
According to their TDP (thermal design power), which represents the maximum amount of power the cooling system in a computer is required to dissipate, the chips are categorized. On basis of the nomenclature it gets obvious that Intel distinguishes Txxxx and Pxxx models. The platform also includes new chips for WLAN and LAN, in detail, the Intel Wireless WiFi Link 5000 module, and the Intel 82567 Gigabit network. E.g., the current 'Mobile Intel 4 series Express chipset' includes a number of new features, e.g., support for dual channel DDR3 memory and the possibility to switch between integrated video chip and a dedicated graphics card. Regarding the current Montevina update you have to distinguish between the new functions of the chip set and changes of the processor itself. The comprehensive review of the first Intel Penryn CPU series is available here. In the performed tests especially the processors with 6MB L2-cache performed clearly better. Furthermore, these processors were equipped with a clearly bigger level 2 cache (L2), which also improved the performance of the CPUs, because it can cache more data in order to quickly provide the CPU with it for further processing. So, a wafer of the same size can now house significantly more transistors (up to 40% more). In the first 'Penryn' update of the Intel CPU series for notebooks the most important thing was that the lithography is now 45 nm.
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