I found this product to be as good as I can expect from a design perspective - it does what it says on the tin and has allowed me to upgrade my computer and play games at higher quality settings. I had 3GB before, adding these has given me and extra .25GB in Win XP but as they are higher frequency (800Mhz as opposed to 667Mhz), I was able to play games at better settings without a performance hit. In Win 7 64 bit, I get the full benefit of these sticks and Crysis plays much better! The only down side is you can forget about trying to OC these sticks, PC won't boot up with these at a fraction above 800Mhz