There are several types of Pentium 4

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Experts answer: under the Pentium 4 up to now a total of 5 are: P4A, P4B, P4C, P4E (32 bit) and PD (64 ) P4A series CPU uses a 256K secondary cache 400MHz front side bus The P4B, P4C SeriesUses a 512K secondary cache is the difference between their two C series with HT Hyper-Threading Technology (to simulate a CPU in the system into two, to improve system performance) P4B series is the 533MHz front side bus is 800MHz while the P4C The front-side bus P4E Series 2Level cache is 1M (1024K) also contain HT Hyper-Threading Technology. 800MHz front side bus is more than 4 478-pin interface using a 775-pin PD contact interface, dual-core theory of the secondary cache used by 2M is its advantage. INTER out now the new Core processorIs really the physical dual-core
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