I've been meaning for some time to buy me a new memory and then I come across here at the Conrad. I had, however, yet Amazon vouchers and got him so bought here (at Conrad only 49.99 but high shipping costs to). I find this working class. The review of Vista for example has increased from 5.2 (3GB 1GB + 2GB) to 5.9. My PC now runs stutter a lot of liquid and the Games. Thanks to dual channel mode, the memory is also quite fast. My motherboard is not able to use only 800 MHz of the full 1066 ... Absolutely recommended!