[Volenti]

I'd like to add another vote for high volecity over high volume water flow.

While I've effectively given up on copper water block designs (in favour of direct die) the results I've gathered from the changes in intake nozzles (low flow+high volecity being significantly better than high flow+low volecity) are just as valid in a copper water blocks as they are in direct die.( I even made a high restriction block, a conceptional clone of cathar's block, before I went to direct die, that easily beat all my previous blocks)

In other words, make the water work to get through the critical heat zone above the core, and then let it get the hell out of the block with as little further restriction as possible.