Some further testing of my Mora 2 Passive + active setup.

[wasserkool]

Picture of my test loop
http://img320.imageshack.us/my.php?image=dsc041313pe.jpg

The second pump in the pic is:
http://www.alphacool.de/xt/product_info.php?products_id=828&cPath=5_26_27

Test 1 - Totally passive

When both pumps are on, the max water temp recorded is 32C while the room temp is 29C

When only the MCP350 is on, the water temp never exceeds 30C and is always 1 or 2 degrees higher than room temp

Test 2 - One single 120mm fan @ 5V

Regardless of which pump is on, the water temp always hover around 27-28C

I guess even with one fan the MORA can keep the temp in check.

[Psyche911]

But what's the loop cooling, itself? So the heat from the pumps, and that's about it?

[MaxxxRacer]

he is just testing with the pumps.

[Fairydust]

Wait with 5V fan the temp is below ambient, check again. You always need to measure ambient temp so we know the delta. In our little conversation i already said that some fans at 5V will be drastically more effective than totally passive.

I suggest using the top G 1/4 thread as inlet on the ddc pro, while the manual says it's for bleeding, it also gives a marginal flow boost.