1) Memory : basic 2 GB
Shared or dedicated ?
2) mi or mib : what means the “b” (no answer of Acer on this question).
3) Mem-Upgrade to 4 Gb (2x 2Gb) : client has to buy also the old 2x1Gb, so he he has to pay 6Gb because the basic-Gb can not be taked back.