From Radiator to block, or from pump to block?
 

I have seen people favor either way, but was wondering what you guys have seen in direct tests for temperatures in whether it is better to have the pump go right to the water block, or have it go to the radiator first, then directly to the block. I feel that the cooler water coming from the radiator would be best, but have no proof. I also plan on putting a video card block on right after the cpu block.

Depends on your system. I would try it both ways. In my case, pump/block/radiator works best.

In my case with Eheim 1250 inline pump, that puts some heat in the water, I run it through the radiator first and then to the block.

I am running a Danner Mag 5 pump inline system. I figured the pump would produce a little heat, maybe a couple of degrees, so I would look to put the block at the coldest point in the system, right after the radiator. Now if I could only figure a way to clean up all the wiring for the hard drives and PS to allow enough room for my watercooling setup.

I killed an eheim pump running pump-rad-wb-pump, but that gets the best temps. As long as you don't have too much heat do deal with(pelts) and you are sufficiently cooling the water, it is best to but the radiator directly after the pump before the water block

--Matt

I really doubt it matters too much. I think rad just before block is best, but if that is hard for plumbing issues, just do it whatever is easiest for you