I can't answer your question directly, but I can explain a little bit about DDR3 and possibly why DDR3 is only available in multiples of 3.Originally Posted by 'Yo-Yo Freak',index.php?page=Thread&postID=163211#post163 211
I'm going to take a totally wild guess.
First of all: DDR3 is more efficient, power-wise. It runs at 1.5V instead of DDR2's 1.8V.
DDR2's speed is figured by taking the base memory clock speed and multiplying it by two of the processor's clock cycles. This is why DDR2-667 memory only runs at 333MHz.
...here comes the part where I'm making an educated guess...
Core i7 chips have three memory channels. This would mean instead of multiplying the "base" memory speed by two, it's multiplied by three. This allows the memory to run at a lower speed, but perform better. (And, as I originally stated, use less power.)
Examples:
[1.8V] DDR2 @ 667MHZ (really equals) 333 x 2
[1.5V] DDR3 @ 800MHz (really equals) 266 x 3
DDR3 is using less power because each channel is running at a lower speed, but with more overall throughput.
Like I said, I can't answer your question directly about DDR3 capacity, but I'd say the 3x multiplier has something to do with it.
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