Ok.
http://www.overclockers.com/articles373/
Now the best block, which is WW, is rated at 0.19 C/W @ 1gpm.
The block that resembles the Maze3 the most, would have to be the Swiftech5000, and I'm being really generous here! It's rated at 0.23 C/W.
So for an 80 Watt source:
1- 80 * 0.19 = 15.2 degrees
2- 80 * 0.23 = 18.4 degrees
So we've got a 3 deg C difference.
To be more fair, I'll include the calcs for the Tsunami, which most of us know, performs better than a Maze3.
3- 80 * 0.25 = 20 deg, for a difference of 5 degrees.
These figures are for the block only, with a flow rate of 1 gpm, and a fully running, and a bit overclocked CPU, emitting 80 Watts.