My server have more than 70 vBulletin working

10 very gig vBulletin more than 50,000 user
20 medem vBulletin les than 5000 user
40 small vBulletin

I need same company our any one speed up & Optimize my server and updata my software

My server info :
Intel(R) Xeon(TM) CPU 3.00GHz X 4 cpu's
Ram 5GB

Its not free I値l pay for that but please in 2co only

Thank you