Software To Test Machine Performance

I have been having a clearout of all my old pc equipment and am now left with a few old pc's. I want to be able to easily identify whats in them, cpu's memory etc as well as identify which is the best overall machine. I want to use this one for a Trixbox PBX setup. Any suggestions of what is best to use, free software if possible....

http://www.cpuid.com/index.php think this may be what you're after

Andy

Or Sisoft Sandra Lite

Thanks for the pointers. I have downloaded both and will try them out when the pc's are up and running.