I am using a similiarly large HC: 9.5 x 6.5 x 2in (effective cooling dimensions, about 11in long including manifolds). Don't ask me where it's from, I bought it from someone who had already used it in a WC system. I have no fans on it now, and it keeps my OC'ed AXP 1800+ @ 1620Mhz pretty cool, at least cool enough to run at load for 4 hours while I play America's Army! Not bad for passive cooling, eh? I don't have a SMBus capable mobo, so I can't say what the temps are exactly.
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