Hello. I'm considering Airplex Modularity System 840 mm (no integrated pump, one circuit) as an external (in addition to internal one) radiator for my system (mixed low RPM / passive operation, planning to mount it vertically on Liquidhaus EXT stand with 6 Silent Wings 4 Pro 140 mm push fans). I have some questions about this product: What is the weight of this radiator for aluminium and copper variants?What volume of coolant can this radiator contain? Also, I'd love to hear about your experienc...