2nd pump?

[XViper]

Ok based on this article:
http://www.techspot.com/community/topics/the-watercooling-guide-from-a-to-z.180876/

I read adding another pump dumps a bit of heat. Will this cause water to evaporate faster than usual? Or maybe I can rearrange my loop to be more effective.

Currently this is my setup
Res -> Dual pumps -> 1st Radiator -> 2nd Radiator -> CPU -> (3) R9 290x

 

[dr/owned]

Pumps dump negligible heat into a loop compared to other components.

GPU waterblocks usually aren't that restrictive because they have a lot more surface area to play with than CPU waterblocks. It's highly unlikely 1 pump is unable to drive your setup. You'd be surprised how little flow is actually needed.

 

[jojo69]

You'd be surprised how little flow is actually needed.

this

 

[Tsumi]

And if you are running 3 GPUs, you can run them in parallel mode. Rather than adding to restriction, each block in parallel lowers the overall restriction of your loop.

 

[spugm1r3]

And if you are running 3 GPUs, you can run them in parallel mode. Rather than adding to restriction, each block in parallel lowers the overall restriction of your loop.

Are you sure that's a good idea? According to Koolance:

A common misconception is that running parallel paths in the same loop is always better. Experimentation is usually suggested. Keep in mind that parallel lines reduce coolant pressure, so results will depend upon the pump and tubing configuration. In a serial system, only 2-3°C is typically added between video blocks.

To illustrate this point, let's say two video blocks are connected in series. The first video block is operating at 45°C, while the second is at 47°C. This is disturbing to some users. They want both video blocks at exactly the same temperature, so the blocks are reconnected in parallel. However, due to the pressure decrease of parallel paths and additional restrictions in the loop, both cards may now operate at 48°C.

 

[Tsumi]

It depends on what you have. If you have a high flow oriented pump like the D5/MCP655, it will benefit from the lower restriction by giving higher overall flow rates. The MCP355 is high pressure based, and flow rates doesn't scale as well when reducing restriction of the loop. However, it maintains a higher flow rate than the D5 when restriction is high.

And while Koolance may claim that as an example, the increased overall flow might actually decrease temperatures rather than increasing it. That's why they disclaim experimentation is needed. Also, I don't see what pressure has to do with anything, as it's all about flow rates. Parallel flow cuts the flow in half to each card (or in the case of the OP, 1/3), but the lowered restriction might actually means it gets 1/2 to 2/3 of the flow it would have gotten in serial. And the higher flow rates will benefit other components like the CPU, in addition to keeping a more uniform coolant temperature.