I've heard really good things about Resident Evil 5, but my CPU is borderline at best. I'm not sure if a P4 3.2GHz will run it or not. Man, I need to upgrade.
As odd as it may sound, both the computer store guy and the online articles are right. In most motherboards, you CAN mix memory speeds because the faster memory will simply reduce speed to match the RAM you already have. The reason for the online sites indicating that you shouldn't mix speeds...