Did want to upgrade the memory of my SAMSUNG R20-Aura T2350 Declan. When I insert both RAM, then always comes the blue screen and the computer does not start Windows Vista. Have therefore currently in the first slot again the original 512MB of RAM and only the 2nd slot one of the two 2 GB memory. So my SAMSUNG R20-Aura T2350 Declan properly (the other way round (in the 1st slot the 2 GB of RAM and the 2nd slot 512 MB RAM), there are also problems with the computer startup) works. Now do not know if it is because of the compatibility of RAM on my PC or on Vista. Anyway, my expectations were not met. My SAMSUNG R20-Aura T2350 Declan however, works even with a memory expansion noticeably faster than before. In so far: Yes, I am satisfied with the Spreichererweiterung - but I would have me do not need to buy 2 of these memory cards. Since I can not judge whether the cause is poor compatibility of RAM cards or it is up to my PC / Vista, my expectations were not met at all events, only 2 stars.