Hello. I have a Dell Dimension E310 (Win XP, 512MB, 140GB HDD, Pentium 2.8ghz). My stock RAM is 512MB @ 533mhz. I want to upgrade to 1GB RAM @ 800mhz. Will the RAM speed be an issue or should I just use 533mhz RAM stick? 1GB @ 800mhz is the only RAM that dell.com has that is compatible with my system.