Voltages and timings I've read the memory stickies over and over and over, but can't seem to pull out the required answer to a few questions. Maybe I'm being particularly thick here so feel free to point me in the direction of an existing answer if that is the case. I have a Foxconn 6150K8MA-8EKRS motherboard. In this I will be sticking an Opteron 146. I'll probably leave the Opty as it is for the first few months before getting into some overclocking action, providing I can understand what I need to do. My board states that it accepts 2.5v DDR400 which I understand to equate to PC3200 RAM. There's a load of PC3200 memory on offer with different timings but there's also PC3500, PC3700 and PC4000 available. My first question is about the speed of the RAM itself. As an example, if I stuck a pair of the Mushkin Redline sticks in my board, would they be running at 400MHz or 500Mhz? What defines the speed at which RAM will run? Second question relates to voltages. Looking at something like the Mushkin HP3200 it states in the specs a voltage of 2.6V-2.8V. And looking at the OCZ PC3200 Dual Channel Gold, they state 2.8 Volts. Does this mean that I have to adjust the voltage on the motherboard to match these specs, in order to get the timings they describe, or will they run at this voltage without any adjustment from me?