So actually it does perform significantly better than a traditional blower GPU (as referenced by Alienware's own in-house testing).
The reason being that normally the single blower fan would have to cool VRM, Vram and GPU die. However, using the Rad Card the traiditional blower can run at lower RPM and still cool Vram and VRM plenty. Meanwhile the AIO will grab all the heat from the GPU die, and transfer it into the Rad Card radiator, which is then cooled by another blower, which also doesn't need to run at full force.