U take a large amount of copper and put a current through it, it will raise it`s temp. Keeping the temp within the copper, i.e. putting a blue design over it, isn't going to disapate it anytime soon. Not even with a fan. U'r pretty much insulating it in.
U could get away with no sink, and allow a rear facing cpu fan.
Or reduce the fins, lose the blue insulation, and have a nice old style spreader if u wanted - and allow a rear facing cpu fan.
Either way, unless u insulate the heat within the devices, they aren't meant to get that hot these days I don't think.