I got a 3.0C northwood 30 capper SL6WK OEM chip from this forum, great chip, I used it with a XP-90 and 92mm panaflo fan, with 1.55V (asus p4p800, default vcore is like 1.475) I could run it 250fsb so 3.75ghz no problem with a ram divider, no crashes, primes with no problem etc.
Then comes...