So I decided that I want to machine my own water cooling system from scratch. I know it's going to take a lot of time for virtually no money saved, but I want some experience machining and it'd be really cool to make something that I'd actually use. So anyway, I can't figure out why all CPU waterblocks have the in port and out port on the same face. It seems to me like if they were on opposite faces (so the flow is parallel to the motherboard) that it would flow easier. Better flow means better cooling, right? Right now I'm still in the design stage, and my first thought was to have a larger cavity than most waterblocks (approx 5/8x5/8" for 1/2" tubing) and have grooves in the copper base for increased surface area. I am not taking fluids until this semester, so I don't completely understand everything that's going on with the water. Would a design such as this cool better than a typical waterblock with the in port and out port on the same plane? Thanks for any help/advice!