I’ve always been controling my system information through conky because I’ve configured it to tell me basically all I want to know. However there are alternatives to conky if it’s a punctual thing.
I use archey (available on aur: yaourt -S archey ) and it really sums things up in a beautiful way. There are other programs out there which share the same function as archey, like alsi (for example) and others.
So, that’s it. Any questions, feel free to ask ^^