I have no experience with the card in question, but the cover likely snaps off, or is held by screws. Seems perfectly sane to me if preceded by a critical examination... remove heatsink from card, ...
Last night I realized that the heat sink from an old ATI card I have is the exact size to replace the GPU HS/F that went kaput in my Xbox. Only problem...I can't seem to get the heatsink part off...it ...