I concur. I received my 2.26 GHz Mac mini today and ran
Power Fractal on a previous generation 2.0 Ghz Mac mini (2 GB of RAM) and on the new mini (1 GB of RAM). The results are
2.0 GHz (Late 2007): 14002 Mflops
2.26 GHz (Early 2009): 15706 Mflops (12% improvement)
As expected, it the 13% improvement in clock speed gives an approximately equivalent increase in raw computational performance. (Note that Power Fractal isn't strongly influenced by anything but CPU performance.)
It's up to you to decide whether or not the extra 12% is worth $180 to you. (I chose yes because I wanted the fastest Mac mini money can buy. I'm also putting in
4 GB of RAM and a
500 GB 7200 RPM hard drive.)