Tomshardware uses a innovatek waterblock for the P4 but
 

they dont exist i went to the innovatek german site and cant find it nowere. anybody know what the hell is going on?

I presume that the Al block he used on top of the waterblock itself is an item he used just to hold it down, I don't know of any actual innovatek hold down for P4's

(who cares anyway. use the maze2, it is better)

i seen a review(but i cant remeber were) were it shows innovatek beat a maze 2.

I've seen a review where a thermoengine beat an mcx462......

I will be hopefully finishing the comparison of these two blocks one day. I am swamped with so much crap right now it is looking like prolly 2 weeks. After using them both with 1/2" barbs I would use the Innovatek in my personal system. The performance is pretty similar (although my testbed changed over the course of the comparison so I have to redo them both) but the Innovatek is much nicer to mount (esp with 1/2" silicone). I really dig the industrial German look of the holddown too; it just looks manly :)