The following is a linkfarm of useful or applicable links for SunOS 4.x - 11.x (Oracle Solaris).
Run your platform's 'prtdiag' with the '-v' option and you'll get all that info (full hardware info). It's under /usr/platform and then the type of platform, this bit of shell-script should get you there:
cd /usr/platform/`uname -m`/sbin/ prtdiag -v
If asked by someone what type of server, how much RAM, or how many CPUs you have, that will give you the answer.