But i thought that ASIC didn't need a good computer to work fine
poptok1 is just spamming and not actually reading what you asked.
You don't need a very powerful computer to control ASICs. So long as it can run bfgminer or cgminer you should be fine.
Yeah, spamming
right, no way i could just misunderstand the guy.
Any way, one unit will give you a loss. 99.9% chance that you will never reach ROI.
Like DuddlyDoRight said, today you will need a 10? machines, tomorrow 20 and after the halving
even 100 miners may be insufficient to get square.
But for sure that will be a good lesson, some fun set-ups to do, and problems to solve.
For learning sake, always worth to try. For profit, not so much.