The question at the time) compatibility.

Recently decided to play the second part of deus Ex. The problem is that before it was 8 gig operatives and is now worth 4. This is due to the fact that repairing computer for a large number of romantikov because the city is very good. few professionals, and as a result later on, I saw what that son of a bitch pulled with phones bought 4 gig of 8 and replaced them with others. Consequently now is 4 gig. What question:
1. Can I put in the comp for 2-3 days and go to another bar toy then it will be pulled back.
2. Do not go if I have to pee....th computer because of this?