guys do i have this right?
radiator>cpu>pump>radiator.....
is my pump sucking water from the CPU or pushing water thru it. Which one is more efficient, sucking water from the CPU block or pushing water thru it?
it really wont matter much (actually not at all imo).
Your choice of tubing size and routing, make it as short a possible by arranging your components carefully in your case for short straight runs, will matter more. Its best to have the pump as low (bottom) as possible so there will never be a possibility of staving for water in case some air gets in the loop. Really, it wont matter much where you put the pump in the loop. I like to put it pushing water into the cpu - then rad then back to pump but thats because I put my rad in the top of my cases and the pump in the bottom and it makes the hose runs neat with no sharp bends in the tubing.