I'm pretty sure I can mount the Swiftech block on the Radeon and will do if it's not enough for the Q6600 (which I picked up today after it was dumped in an alleyway and handed into a local police station). I'll do it using the mounting plate I pulled off the Radeon during it's destruction.

Anyway, my E4300 has been idling as low as 5C and temps on the GPU have been improved simply by pointing two 80mm fans at the radiator, they're keeping the water below 40C under load. When I dig out my pair of Sunon monsters (don't know where I hid them) this should improve further.
On a slight downer (and against littleowl's advice) I have been running the Peltier off a spare PCI-E lead, the only problem that's cropped up is that the insulation on the wires near the terminal block and the terminal block's insulation has melted a bit so I may have to get a ceramic cased terminal block and use four wires rather than two. No power issues so far though so it looks viable for now.
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