That's a very interesting way of going direct-die, with the center directly cooled by water, and the edges by the block->water.
I am a bit leery, though, of the sealing method. It looks like you must be very precise in lining up the block to make sure the opening is centered on the die, along with high, even pressure to make sure the block doesn't tip, and make a leak.
Have you had any problems with leakage due to a slightly improper tightening of the block, or cracking the corners off a processor due to placing all of the mounting pressure strictly on the edges of the die?
EDIT: Also, what is 'fukk' cooling?
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