damric :
Mass flow rate is proportional to heat transfer in a closed loop. Pumps can also add heat, but in this case your volume and headloss is such that I would definitely add another pump, in parallel.
ty, really a beginner at building.........when you say parallel that means just another pump in the loop somewhere, or add another reservoir and pump (one res and pump with rads to the cpu, and one reservoir and pump dedicatated just for gpu's?) ty so much for the help.