Wc Msi 7800gtx

[SLI AMD 24]

I'm watercooling my MSI 7800 GTX, I'm using the Koolance VID 200-L06 (I think is part number) It covers all but one of the memory chips on the front and none on the back. I was wondering if I need to go back and get heatsinks for the video memory or if they will be find free air.