OK, I hooked up a parallel flow.
Basically, it puts the MOSFET and HDD coolers in their own branch, allowing the water to take path of least resistance.
This increases the flow through the whole system to 5.7 lpm (1.5 US gpm) BUT it's quite surprising just how little water flows through the restrictive section (the MOSFET and HDD blocks). There wasn't even enough 'oomph' to bleed that section
This is the first time I've witnessed first hand the benefit of having everything in serial flow. The water really does
want to flow through the less restrictive path!
In this case, that probably isn't too bad because the MOSFETS and HDDs are the smallest heat loads, perhaps along with the Northbridge.
Just tested - they are getting 2.2 lpm (0.6 US gpm). I think that's plenty for them.
Cool!