Normal
The Coolchip site shows some more details on the 'round' heatsink design:In which you can see some copper below the outer fin ring, with the mounting plate sandwiched between. Could be just a copper shim, or could be a heatpipe 'wrapped' around (there's a prominent gap, which would not be necessary for just a shim).The site also shows a second design:Which foregoes the copper parts and folded fins for a single-piece milled aluminium outer heatsink with milled fins, that covers the entire keep-out area.The rotating heatsink/impeller appears to be identical for both designs.
The Coolchip site shows some more details on the 'round' heatsink design:
In which you can see some copper below the outer fin ring, with the mounting plate sandwiched between. Could be just a copper shim, or could be a heatpipe 'wrapped' around (there's a prominent gap, which would not be necessary for just a shim).
The site also shows a second design:
Which foregoes the copper parts and folded fins for a single-piece milled aluminium outer heatsink with milled fins, that covers the entire keep-out area.
The rotating heatsink/impeller appears to be identical for both designs.
