It seems the Powercolor 6950 PCB is more or less the same as the reference 6870 one and as the AXPII is compatible with the latter I was hoping it would be OK, but it seems one of the few things that Powercolor decided to change is the fan header.
Reference 6950s (and 6870s) use a 4-pin fan header, whilst Powercolor have used a 3-pin one (on both their 6870s and 6950s) so the AXPII connector won't fit
I don't know if there's any way to adapt it, or if the AXPII needs signals from all four pins. I realise the AXPII comes with a Molex adapter to power the fans at a constant 7v or 12v, but I'd much rather have them controlled by the card.This
is a reference 6950 and this
is a reference 6970, whilst this
is the Powercolor 6950 and this
is the Powercolor 6970.
As you can also see from those pictures, the reference 6950 and 6970 both have the regulator in the upper-left corner that is absent on the Powercolor 6950. The component on the back of the Powercolor 6950
by the mounting hole is present on the 6870
(not quite as close to the hole though), so that obviously doesn't need a heatsink. I still don't know if there's an extra component somewhere that needs a heatsink though. As you would expect, there's some extra components on the Powercolor 6950
that aren't on the 6870
so maybe one of those should be heatsinked, although thinking about it, if anything isn't heatsinked already I guess it won't need to be with the AXPII.