The first line says the ram heatsinks are optional...
"Optional extra for the VF1000-LED video card cooler"
From what I have read regarding cooling of video card ram, and even regular ram, it that there isn't really much benefit in having head spreaders. Atleast that is the case when there is a piece of thermal tape between the heat sink and video card ram. That one you linked to looks pretty fancy, but I wouldn't bother.
no im pretty sure thats just an add on. the fan part should be just fine. why do you want a vga cooler anyway? i had the xfx 8600gt XXX and it ran fine in the way of heat. it was warm but not overly so.