Watercooling multiple GPUs

rwatki

Distinguished
Jun 18, 2009
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Im interested in building a rig with multiple (6-8) GPUs, each of which would be water cooled. I have not selected which GPU yet though. One concern is that most motherboards space the x16 slots at intervals of 2, meaning that double-width cards are almost touching each other.
Im looking for a water cooler manufacturer who has the inflow/outflow on the top of the card to allow for 6 o 8 cards to be stacked right next to each other without interference.
Are there any pointers to reviews for water blocks which have ports on the top?