I just upgraded my laptop in the tooths of 2 * 256 MB to 1GB * 2 and the speed advantage is enormous. Some applications were running not even correct. The rams I have thoroughly tested the bekanntne MemTest x86 V3.1, before I start Windows, everything is OK. I mus say that probably are not brand new rams because something is probably no longer in production and it probably is residues wasmir has also declared a seller in the media market. My candidate had a production label with the Code0534 what week 34 means in 2005. Nevertheless, to recommend good material and if you have an old laptop.