I bought here on Amazon, the notebook Asus A52F. It quickly became clear the 2GB memory on board in Asus are for the included Windows 7 just the least. The memory test showed that Windows 7 1.7 GB occupied. That does not leave much for ihrgendwelche programs and so it was. All programs only ran on the hard drive and the computer was something of slow which made it less fun to handle this. So the memory had to be extended. Screwed back of the notebook and once looked. 2 benches and 1 in the bank pocketed 2GB memory module and the 2 banking is free. Of course, looked at Amazon and I quickly came to the Kingston CL7 memory. SO-DIMM DDR3 RAM 1066MHz 204.polig, should fit so. I ordered the Kingston 4GB in size and did not have long to wait the next day he was there. And it was very simple. Notebook Screw, the memory plug (went but a little hard to even keep) and test run. In memory test now available 6,177 GB of memory. The Computer now works significantly faster in the full Windows setting. Finally, after 14 days trial run now, I can only say that the memory is fast and stable. To get a very good investment to everything from the calculator out.