Multiple of two doesn't matter for something like that. If it did, AMD's triple core CPUs wouldn't be worth anything but the tests show that they are actually doing exactly what you think they would: performing smack in the middle between dual and quad core CPUs that have similar single-threaded performance.
All the benchmarks I have seen with 1366 point out that the triple channel memory helps it in benchmarks where you have to shove a lot of things into and out of RAM. That means things like SysMark and Crysis at 2560x1600. Assuming you have an SSD, load times should decrease for everything as well since there's more throughput available, allowing all that data to be stashed away into memory faster. That's why even the original 1156 "i7" CPUs couldn't keep pace when matched on clocks, and that's why I have never ever recommended them. Sandy Bridge 1155 closed the gap mostly, but why would you want the crappy one-off when the real deal is right around the corner? That would be like me buying an AMD 1100T CPU right now because it's good enough for what I need. However, it's already obsolete because the newest is literally a couple of weeks away.
Besides, what do you need a huge cooler for if you are water cooling? And if you want to build bleeding edge performance, why aren't you water cooling?
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