I know this has been talked about and explained before, but I got bored and wanted to make a new one to hopefully explain this a little better to newer folks in the forum.
This is why you want to run pumps in series over parallel. Most water cooling systems are fairly restrictive (and getting worse as designs continue to get more restrictive to squeeze every last drop out of the waterblock), so that's where series and the stacking of pressure comes in favor.
Parallel is only really better when you're talking extremely low restriction setups, pretty hard to do actually. And in that case, you're already moving plenty of flow with the single pump.
Anyhow, hope this helps someone...I was bored...
The single pump curve was one that I tested with an XSPC regular top. The two series/parallel curves are theoretical. Parallel = 2X Flow rate numbers. Series = 2X pressure numbers. I can't remember the exact gear for the High and low pressure drop curves, but they were pretty extreme examples if I remember right. Regardless, it gives you the idea. We have high restriction systems and that's where series is the better option...
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