The Pentium 5 will not come again for a long time, intel has ditched the Pentium 4 name & their next Dual core CPU, on the Intel 945 & 955 chipsets will be caleed Pentium D xxx, where XXX denotes the CPU number (660, 880 etc)
Socket 478 is for the old Pentium 4 northwood & some Prescotts, found in Intel 845, 850, 865 & 875 Chipsets
Socket 775/T is the new Intel socket for a long time, as it provides a good upgrade path, from Intel, for the Intel 915/925 chipsets,
it's just the socket & doesn't gives any performance difference
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