the BigWater cooling systems are pretty crap and there is no way around that. while they may have fixed the leaking issues it still has a useless pump and a poorly designed waterblock. there is no use swapping the pump as it would not benefit overall cooling significantly and there is no use swapping the waterblock because of the weak pump. if you were replacing both then you may as well get a new kit anyway.
the bigwater performs only slightly better than the big typhoon
