Actualy your thinking is completly backwards.
Two sticks of memory on a single channel will limit the overclocking ability more so then if each stick was on it's own channel (Dual Channel)
Memory clock speeds have many things that limit their speed, but bus capacitance or impedance is the greatest factor.
Impedance, is the amount of electrical resistance to a change in voltage at a given frequency.
What that means the higher the impedance, the slower the clock rise and fall times.
(The time it takes a signal to change from a 0 to a 1 or vis-versa)
This means the more memory you have on a single bus, the more capacitace, the more impedance, limiting the actual maximum clock speed you can reach.
This is why opteron's run at 333Mhz DDR when you want to run more then four dimms or memory.
It is why 939 sockets have a maximum of 4 dimms, 2 per channel.
It is also why socket 754's have a maximum of 3 dimms, as there is only one channel.
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