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Got the Noctua NH-U9S in, it's clearly a better fit when using an internal AC-DC brick:



But I still had issues with fitment in this orientation, it was slightly in the way of the AC-DC brick. I had to improvise the mounting:



Finally it's complete, excluding the power button ! It's now running with an overclocked i5-4670K @ 4.4GHz (vcore 1.25v), idle at 38°C, AIDA64's stability test is hovering around 76°C.