I have no idea whether the Gemini block out-performs the MAZE2, but I did notice one design difference. From the CAD drawings on the site, the area that sits on top of the core is the comma-shaped beginning of the channel wall. The MAZE2 has the beginning of the channel over the core while the Gemini has 12mm thick copper over the core. Is this correct?

--Rob

BTW: Wasn't this a thread about Swiftech? :D

Phaestus - we get back to the "depends on the system" issue ;) For example in Joe's case, he's over 2.5gpm based on the test figures he's posted, and if you're correct about his setup, that was with 3/8" tubing (and 1/2" tubing is a larger change than most think in regards to back pressure, it just isn't noticed when using a restrictive block. 1/2" tubing has a 77% larger cross section than 3/8").

Regarding rad issues, we get back to systems again - size/type of rad and single or dual rads.

As far as blocks, I will agree that small channel single path blocks won't benefit much past the 1 to 1.5gpm range (the improvements become fractions of a degree). But, for larger apparent cross section blocks (whether that is accomplish with mutliple parallel channels or larger channels), it can and does make a difference.

And who said anything about "common use"? (and define the scope of "common" - all users or all high end users or...) :p

BTW - nice review on the CrystalFontz :D (and how much would software be worth to you?)