If two of those are plugged into the new 15in late 2016 (touchbar) MacBook Pro, will the fan inside the Macbook Pro be turned on at all time?

Or can we expect near silent operation. This would be with the stock Radeon Pro 455 with 2GB of GDDR5 memory (*not* with the upgrade to the Radeon Pro 460 with 4GB of GDDR5 memory )

LG UltraFine 5K Display

LG UltraFine 5K Display

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