Lukee: I agree with ShoNuff. The length of the path that the heat must travel before it can be transferred to the water is huge on the Extreme board. Given this and the lack of airflow around the MOSFET area (as you likely won't be using a fan to cool your CPU) the thermal design seems less than optimal for situations where extra air cooling from the case is not provided.
It's also worth nothing that since the Extreme motherboard also has the option to be air-cooled rather than water-cooled it has a rather fanciful heat sink BELOW the Northbridge block (Picture). Finally if you check out the underside of the Southbridge part of the cooler on the UD5 (which is presumably the same on the EXTREME board) you can see that the heat path from the SATA 2 chip to the waterblock on the Northbridge is very, very long (Picture by [XC]Atomicpineapple). I'm not sure how cool this chip needs to be kept as I can't find a thermal and mechanical guide for the chip. No doubt the cooling provided by the EXTREME board is sufficient but I plan to have minimal air flow though my case (except over the R.A.M) and I just love to over do things.
CedricFP: I don't have any measurements YET but this is one of the first blocks I will be checking for compatibility. Nevertheless a full cover block for the NB or indeed a block for the SB and blocks for the MOSFETS are still required.
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