A few months ago the first detailed review of overclocking an X2 3800+ was put out, and the results were very impressive. At the time, and even now, in fact, Dual Core Pentium overclocking wasn't around or being reviewed. Both have been revisited over at Legionhardware, and we get to see the two titans of desktop multitasking go head to head in an overclocking challenge. The article goes in depth with the the X2 4400+ and the P4 820+.
It remains fair and the results are all around interesting and very promising, whether you prefer AMD or Intel. The P4 really shines when it comes to memory bandwidth when we see some incredible transfers of nearly 9GB/sec. It's a great read for any overclocker and anyone considering a dual core for overclocking purposes.