The Pentium II came in a new sort of packaging with L2 cache built in. This was done in order to get the L2 cache closer to the CPU which is faster. The Pentium MMx ran in socket 7 which has L2 cache on the motherboard and thus the CPU can only communicate with it at the bus frequency (usually 66MHz). The Pentium II changed all that making it noticeably faster.

The Pentium II can access the L2 cache at 50% of the clock frequency of the CPU. In this case the L2 cache runs at 133MHz. > Read more

Quite a jump compared to the old Pentium II because the 350MHz (and both 400 and 450) models use a 100MHz front-side-bus.

The 350MHz 'Deschutes' is the only Pentium II with 'Deschutes'-core that uses the SECC (Single Edge Contact Cardridge). The 400MHz and 450MHz use SECC2 which doesn't have a metal plate in front of the actual CPU so the heatsink can directly access the CPU for better cooling. > Read more

Just like this Pentium II 350 but with different sSpec number. > Read more

Same as chip the Pentium II 350 but different packaging. This CPU uses the SECC2 packaging which is better for cooling the chip. As seen on the photo the chip is open and the heatsink can be attached directly. Downside is that the chip is more fragile this way. > Read more

The fastest Pentium II around. This one comes with Intel's cooling solution which works out pretty well. For the rest it is comparable with this Pentium II 400. It also has the 'open chip' for better cooling. > Read more

Same as this Pentium II 450 but without Intel's cooling solution. > Read more