@sweetdarkdestinyI was wondering if you had verified it yourself. I have seen many claim it's ~6V but haven't gotten around to checking it. It also doesn't need to move much air because the heatsink by itself is almost enough. And if you change to the slightly larger GPU heatsink there's definitely no need for a fan.
Well, since you're sure, and SS_Dave is sure, I don't want to be one spreading misinformation. Unfortunately my multimeter has broken down, so I couldn't fully verify, the best I could do was an observability study and indeed it would seem to be 12V or close to it. Thanks for setting me straight!