The IPX is a Sun4c, and the Classic is a Sun4m.  Sun will be supporting
   Sun4m for at least one more release of Solaris, though if you're running
   NetBSD, you probably don't care about that.  The Classic should be a lot
   faster, but I wouldn't use either of them for graphical work.
   	Greg


having run both IPX and classics a lot, i have to say that their
speed is very very similar.  the faster sbus & cpu mhz are offset
by the insanely small cache.  definately a classic is not a "lot
faster".  however, i've had none of the weird & strange crashes
i had with an IPX (any sun4c for that matter) have never occured
since i started accumlating & using classics.  :)  the built-in
twisted-pair is also nice.