A method of improving access to a main memory of a computer system includes providing a main memory including at least a first memory of a first memory configuration and a second memory of a second memory configuration, and providing a choice between the first memory and the second memory for access to the main memory, wherein access to the first memory and access to the second memory can be distinguished by the choice depending on the respective access behavior of the first memory and of the second memory, and the choice is provided by a running application program.