I'm not sure what you are trying to refute with the above post, as the res/top I linked to doesn't make a 90 degree bend.
The one thing almost everyone doing any water cooling agrees on is to use an aftermarket top for the DDC pump. The stock top kinda sucks, and it limits you to 3/8" ID tubing.
We already know that MCR drive series is acting as a pump top. What we don't know is how good of one...
When I wrote that post and asked that question at XS I was still confused on the direction of the pump flow. For some reason I kept thinking the DDC MCR Drive pump was pushing water through the radiator (rather than pulling water through). This caused me to be confused on whether the inlet was "center" or "side" (even though I was being told "center").
Okay now back to pump top testing. How can an experiment be set-up to compare pump tops? How can we isolate variables when possibly less tubing is needed when using the integrated Swiftech system? I am assuming the Swiftech MCR drive top could be removed from the radiator, but does this introduce any new variables (besides extra tubing length) that wouldn't exist on a completed system?
Like you said, until this happens we don't know much better or worse this system is compared to a system made up of separate components.
However, If you look at that link to martin.skineelabs.com I gave the single most important factor determining flow is the restriction of the other components (
besides the pump top). In fact, a stock DDC pump flows almost twice as much as a DDC pump w/ XSPC top if other components in the loop are more free flowing.
How much difference in pump top design is potentially offset by having the DDC pump directly connected to the radiator with a "center" inlet design? Looking at those graphs we can see there is only ~10% spread between the best center inlet pump top and the worst center inlet pump top, but the potential exists to increase flow ~100% with stock DDC to 200% w/ center inlet DDC if the restriction is reduced from other components in the loop.