Pc i bought came with 1gbx1 and 2gbx1. Will I have any issues replacing the 1gb with a 4gb so that I will have 2gbx1 and 4gbx1? If not should i just swap out the 1gb for the 4fb or put the 4gb where the 2gb is and move the 2gb to where the 1fb is now? It is a lenovo pc tilapia CRB.