Well actualy I'm not quite sure. I haven't tested it yet. Currently i'm using some other blok in my main system (simmilar to this one
Here
and it performs very good (36°C at full load with Tb B 2100+ @ 2400MHz). You can check put my pictures of that
here.
For this block I'm still waiting to get proper water connectors (just ran out of them

). I'll put some results on as soon as I test it.
Oh... the pump I'm using is MaxiJet 1200 (1100 liters/hour). I'm thinking maybe to use Hydor Seltz L30 (maybe even L40 - 2800 l/h

)