I am able to OC my Northwood 2.4B to 3.19 max, 3.09 stable on air in an ASUS P4SDX. I was using a modded case with ten or twelve fans, ducts, shrouds, etc. and an aerogate 4 with AS5. I have since swapped the guts into an Antec Sonata with a Heatronics Zen Heatlane passive heatpipe CPU cooler supplemented by a single Nexxus 120 zip-tied onto the heatpipe. The only other fan is another Nexxus 120 exhaust. Of course t he PSU has a fan.
I am unable to OC past 2.8 without overheating with the quiet set up. However if I had bothered to watercool or phase change the 2.4B I believe 3.2 stable would have been possible--it seemed more like a Mobo issue than a CPU issue as far as stability over 3.0.
Just for the record I viewed a legitimate post of a CPUZ-ID from a an OCer in Japan that was well over 4 gigahertz--I believe it was 4.27 I will see if I still have that image on drive...
Some Historical literature: http://radified.com/CPU/intel_northwood_pentium_4.htm
And my personal favorite--liquid nitrogen....
"Today we cooled the new Intel Northwood 2,2GHz CPU with liquid nitrogen (LN2 -196Â°C).
The motherboard used in the tests was Asus P4B266 based on the Intel 845 chipset (DDR). There was a voltage modification on the motherboard which allowed the VCore to be raised as high as we needed. The memory module was Crucial PC2100 128MB and memory settings were the fastest possible (CAS 2 2-2-5).
We used a copper bowl on top of the CPU and poured some LN2 into it. It took a while until the CPU temperature started to drop and when it was cold enough, we started the test.
First test was run at 3300MHz (FSB 150MHz) and with no problem at all (VCore 1,9V). The next step was rather high but after raising Vcore to 2,05V Northwood worked stable at 3520MHz (FSB 160MHz). We went on with the tests and finally hit the limit.
We were able to boot to Windows 2000 when the CPU clock frequency was 3675MHz (FSB 167MHz) but we couldn't run any benchmark programs. The highest STABLE CPU clock frequency we were able to reach was 3630MHz (FSB 165MHz). At 3650MHz we were able to run heavy benchmark programs such as SuperPi and Pifast successfully although the VCore was quite high (2,12V). It seems that Pentium 4 can handle it without any conflicts.
Check out the pictures above
I think the 3675MHz Wcpuid-shot we were able to get can be considered as the overclocking world record at this moment (17/01/2002), but I'm pretty sure the Japanese will try to beat it as soon as possible
BTW, Quake 3 Arena was quite fun to play when the CPU was running at 3500MHz!