Will I notice a difference in games if I was running 2GB of Crucial's Basalstix that goes for $480 (spelling?) on an E6600 Core2Duo and if I was running 2GB of Patriot RAM that goes for about $180? The price doesn't seem worth it to me...
If the RAM speeds are the same, (not taking into account timings or overclockability) then you won't see a big enough increase to justify the extra money.