Is this a good PC to build?

Ive seen people get 4ghz with this cpu.  Now THAT is a crazy oc!  But I seem to be stuck at 3.55.  Any higher and it doesnt boot. Im still trying to go higher, but to no avail.

Edit:
I made it!!! Im at 3.6 400x9 1.55vcore. 

So what will you do when you hit the point that it won't recover from.  What a waste of hardware.  Unless you are only using this as an experiment to see what you can do.

I've always kept with the rule of thumb to ONLY go up to maybe 115% of stock speed, it's unlikely that most CPUs in a batch will exceed that anyway. Although I've never overclocked... well, except I overclocked my 286 by replacing the crystal oscillator! I sped along at 16mhz when all the pansies were... well, actually this was 2002 so they probably had faster PCs, but my point remains.