Quote Originally Posted by Petra View Post
Actually, it's interesting to compare the old DDC-1's to the DDC-3.1's that replaced 'em... the DDC-1 produces produces more head pressure and has a stronger "first half" curve, whereas the DDC-3.1 lags behind until the second half of its curve (where it has a very slight performance advantage).

Swiftech has some decent curves comparing the two that they put together after I brought the issue to their attention (link, scroll down)
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It looks like they are equal at about 225 lph, or 1 gpm... so as long as you manage to keep your loop at 1gpm or more, you'll get better pressure.

A somewhat worthy compromise don't you think?
Or am I misinterpreting that graph.