Not only the 280x but other GPUs as well (gtx770). The power draw of 280x is what, 240 watt? 8 + 6 pin (150w + 75w) + 75w pcie slot = 300w. So if highly OC'd it could probably reach 300w and if run 24/7 mining, the 8+8 pin would make sense.
I'm not quite sure but it's possible that having more pins feeds the card with more stable power, even if actual power consumption could be handled by fewer pins.
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