Will 2x d5's be enough?

[Martinm210]

Will 2 d5's be enough for 12' of tubing with a 3'-4' climb and 2 water blocks?

The blocks are fusion v2 + mcw80 and there is no radiator.

I was thinking of getting tops for the pumps but if they can handle it stock i may not bother.

So is this a closed loop or something like a bong cooler?

If its a closed loop the climb does not matter (energy lost in lift is returned on the down return) Potential energy is essentially canceled and can be ignored.

Also the 12 feet of tubing is a minor loss and can also be ignored for the most part. In a closed loop, a single D5 would even be plenty let alone two. An open system like a bong cooler is different though...there you do have to think lift, because the energy on the shower down is in the open air and completely lost.