Originally Posted by darwing
So if I wanted to use all three, because I'm having a hard time with my config design, and using all three would help.
If I hooked the res into the top directly, then had it shooting to the GPu on one side and pulling from the rad on the other...
So how would that effect flow and efficiency? Or is it even possible to pull from the res and rad at the same time?
What you're saying would work, but would be a PITA to bleed the air properly.
Basically a centrifugal pump works by taking in water at the center, then shooting it out the sides.
That pump top has an intake at the top, and another one on the side. The one on the side goes in, turn 90 degrees, then enters the center of the pump. They used to sell the DDC pumps that straight up take water in from one side, enter the center, and shoot it out the same side. This was an issue for a while, because it drops pump efficiency by a notable amount. If I recall correctly Koolance's PMP400, which is their rebrand of the Liaing DDC, gained about a whopping 1 PSI pressure gain when you used a pump that intakes straight from the top. 1PSI may not sound like a lot, but when speaking about tiny pumps and 1GPM flowrates that are used in liquid cooling it actually is a significant gain in pump pressure.
Hooking up the pump the way you're thinking would also, as previously stated, make it hard to remove air from the loop. Usually when bleeding the loop, all the little air bubbles circulate through the loop, then into the reservoir, then pool at the top where they are no longer bubbles, or circulating in the loop. Since your proposed idea has no intake in the reservoir the bubbles would never enter the reservoir under normal condictions you might have a hard time removing them.
So your idea would work, but it would add some complications as well as a notable unneeded pressure drop. Honestly, if I were you, I'd just go:
>res>pump>rest of the loop> back to res
pump>rest of loop>back to pump
Your reservoir should have two ports at the bottom. If it's hard to route the tubing due to it being a tight fit, grab a 90degree fitting. That should give you enough room to keep the tubing fixed up properly.