hmm interesting indeed, here a XGI Volari Duo V8 DDR with a different cooling Thandor:
on the left ABiT Volari Duo V8 ULTRA , on right Volari V8 Ultra, they have a red brown like PCB
The Volari Duo V8 Ultra with DDRII has a green PCB:
and the Volari Duo V8 Ultra with DDR has the black PCB!!! Which is your Card Thandor
here the Power Color DDRII version of the Volari Duo V8 Ultra also that green PCB again:
here a pic of the Volari Duo V5, don't see any difference with the Volari Duo V8 U DDR though:
and here the Volari Duo V5 Ultra
and yes a green PCB it's non ultra version has the black PCB: