I overclock a P4 rated at 2Gig up 16% to 2,3Gig..... had to put o a supercooler onto the processor to handle the the work load, but that was even before I overclocked. It runs at around 35 degrees C .... 24/7 and there are no problems at all...... Had to use WD40 and soak the P4 in it overnight to detach it from the old heat sink - hahahahaha never tough it would work again .... amaizing what WD40 can do

But your overclocking is impressive !!! 21% - well done. How does your memory hold out? Mine will not take more than the 2,3 G I have given it, the memory is only 2 x DIMM1 256 MB PC2100 DDR SDRAM (2.5-3-3-6 @ 133 MHz) (2.0-2-2-5 @ 100 MHz)...... so this is the bottleneck.