You don't have to worry much about your ram. As long as you don't put much more than 2.1V in it, you'll be fine (2.1V is fine sustained, but you shouldn't keep it at 2.2+V for a long period of time). You can't really destroy your ram unless you put too many volts in it. Check your timings, and make sure they are 5-5-5-15, and the voltage is 2.1V, and you should get somewhere in the DDR2-800+ range. My Corsair memory tops at DDR2-900 @ 5-5-5-15 @ 2.1V, or around DDR2-796 @ 4-4-4-12 @ 2.1V.