What kind of setup or rig has 550 MH/s of scrypt mining power?
also, whats a good guide to start some serious mining? Like, 4 video cards per computer or something?
Do you mean KH/s? A single HD 7950 should get you around 700 KH/s when mining scrypt coins. So with 4 7950s you should be able to get around 2.8 MH/s which is definitely a pretty serious setup for mining.