Notice the GTX570 at the bottom of the chart? A mid range card from last generation is using more power than everything from this generation. The other thing this chart lets you know is that the 7950B numbers are around the power consumption you can expect when OC'ed to around 1100-1200 on the GPU core. The 7950B bios sets the vcore to 1.25v which is just absurd because the stock bios will allow most 7950's to reach at least 1000mhz on the GPU core. Power consumption this generation isn't really an issue.
Yes, that's a good point. I guess at the end of the day though I like to see it driven down as low as it can be, and NVIDIA is doing that a fair bit more than AMD right now. But let me ask you this - would that difference of 61W make a difference in PSU choice anyway? I currently have a 650W but am shopping for a new quieter one. I'm thinking I can drop to 500W maybe. I don't know if GPU choice between these three cards (660/670/7950) will affect that decision or not. I would also want to be very focused on noise output from the particular vendors' coolers.
What you say about the 7950B BIOS makes me want it even less though. They intentionally set vcore to a value higher than it needs to be, increasing power consumption and heat. I would feel compelled to lower it somehow through a utility, but I really don't feel like bothering with that stuff.