While researching radiators I've found it quite difficult to actually find documentation on the flow design of pretty much any radiator. I was looking at the EK-XECoolstream 360 and the XSPC RX360 V3. 
 
My question is: 
Do these radiators have essentially two chambers? Like, does the coolant flow in one port, down one side of the radiator and then back through the opposite side and out the other port? Is there a "wall" dividing the radiator in half to ensure that the coolant uses the entire length of the radiator? 
I'm thinking a radiator with no specific flow, would have the coolant enter and then immediately exit (path of least resistance) if there were no specified flow path. 
 
I'm assuming this is how it works, but for the life of me, I can't seem to find anything to confirm. 
 
Anybody know for sure? 

 

 

If the ports are on the same end then yes they are basically a two chamber setup that flows in a U shape (double pass). If they are a cross flow with one port on each end then they would be a single pass radiator in my experience. But that may be manufacturer specific.
 
*Bah Dave beat me to it. Stopped to talk to the wife and was beat to the punch.

I find it hard to believe you couldn't find answers unless you are very lazy or never heard of Google in which case I recommend you go with an AIO water cooling setup.
Try reading some reviews of radiators they typically go in depth on such things as fin count, fan spacing, build quality, flow rates, and what each radiator is optimized for. Some are geared for silence some maximum cooling at the expense of noise. I would say it's very easy to jump in head first and come away very dissatisfied unless you are willing to dig deep and know your stuff before you buy in. If you are willing to start your education head over to Thermal Bench and read all of his radiator reviews then start on the fans reviews and read all of them too. Forums are great for tweaking and tuning your education but they will be filled differing opinions which will be confusing at best. The better reviews contain raw data collected in a scientific environment that distill myths resulting in conclusions you can rely on. GL

EVGATech_DaveB
Most radiators flow in a U shape.  The tank that has the threaded section for barbs and whatnot are separated from each other, to keep them from bypassing and not cooling.  The flow to the opposite end of the radiator, into the other tank, where the water leaves the smaller tubes, goes around the corner and into the next set of tubes, hit the other tank and exit the radiator.
Cross flows, at least the ones I have used, are triple pass radiators, the same process as above, however they make on additional 180, so the water actually has more time in the radiator, which in theory allows it to dissipate more heat.

Actually nearly all cross flow rads now are a single pass to keep liquid flow restriction lower, and also have a performance deficit.