However if they are mistreated as in this case:
All bets as to the stability and reliability are off
You MUST make sure that the computer has plenty of room for heat dissipation and air circulation. If you don't, then the system will be slow, unstable and you could be risking a fire.
So please give your computer room to breathe.
If you think your computer is running slow or you want some upgrade options or advice, why not call us or pop in for some free advice over a free cup of coffee?