My blocks are 3"x2" as that is as big as I can get on my Epox 8K7A without some serious mods that I don't want to do. If the block is wider it has more surface area on the bottom of the block to "spread" the heat out so all the chanels get used.
If you mobo is mounted correctly in the case then weight will not be that big a deal. If you want light blocks go with Aluminum as it is much lighter than Copper and still cools well.
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