Conventional wisdom is that this doesn't matter because the Alphacool (and other European waterblocks for that matter) are "designed for low flow". You can see such comments perpetuated in other reviews of this block, but looking at the above graph it doesn't seem to be valid... In fact the relatively thin baseplate and accelerator nozzle make the NexXxoS block perform extremely well at higher flow rates.



Link: ProCooling