060 is quite a lot better than 040. After I got my 060 I gave my 040 machine away.
Well I just recently got my first 040@40 (which I got to upgrade to 060@66) and can tell you it's 3X as fast as my 030@50 and have seen no compatability errors in WHDload that I've been hearing about for years.
I've had it in my desktop running for days with no issues and the CPU barely gets warm to the touch (mind you it has a small fan on it & my case has another fan).