Bring a lease of new life into your age old P3 system with the fastest Pentium III ever created, the 1.4Ghz Tualatin.
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These things can keep up with 2.4Ghz Pentium 4's in many tasks, and were an embarrassment to the Pentium 4 lineup for many months after it was released. If going from a bog standard Coppermin P3, say 933Mhz, to one of these, it would feel 2 - 3x as fast!!