The heatsink that is doing all the work is a dual heatpipe design that covers the GPU and VRM. There is no additional power requirement, the card runs purely from the power coming from the PCI-E slot, and has only a 75W TDP.
The KalmX heatsink is somewhat larger than the standard for this type of card, so it takes an extra slot, and because it's sitting there essentially stewing in its own heat rather than blowing it anywhere it is advisable to give it some room. Having a well cooled case is also a must for this sort of cooling (see our guide in issue 199).
Palit has not yet released the price for the GTX 1650 KalmX.