You keep misunderstanding me, DDR600 will be able to do 300HTT no question and I'm not arguing that...but what I'm saying is your memory won't be what limits that, but your processor will
Basically if you were to try and run 300HTT with 1:1 memory with a 10x multiplier you'd get a 3GHz core, but your core might not be capable of running 3GHz...therefore in order to maintain that 300MHz HTT 1:1 you have to lower your CPU multiplier to a point where you processor will be able to maintain those speeds
What I'm saying is you won't be able to run 300HTT 1:1 with a 10x multiplier so buying a processor for that specific reason doesn't make sense