Heh, I went from 2x2GB 800MHz kit to 2x2GB 1066MHz, even when I knew there is hardly any difference Well there is a point to all this madness. it gives me options in the future with CPU upgrade. No need to worry about processor multiplier, as I know these have enough (FSB) in them. 800MHz kit maxed out at about 940MHz 5-5-5-15 with 2volts and I run these 1066MHz 5-5-5-15 with just 1.9v. Oh and they look way sexier shining all gold, than my cheapo a-data stock red spreaders did Don't know how AMD system is, but in Intel you max out the bus bandwidth, hence faster memory doesn't give you benefits, unless you OC. 667MHz memory would be enough to any non extreme processor with stock clocks.