None of these cards came out at the same time, but the point is they are all available NOW. You can't argue past and future in a present situation, lol. How would you have known? You wouldn't have! Perhaps you need to read the disclaimers again in post #2.
You are missing my point, because of the statement you made. For instance, sure GTX480 is available NOW for
$300. But hardly anyone would buy that card when you can get a GTX570 for
same price.
I mean, yes, I suppose it's useful to see how much more efficient modern cards are. However, since you brought Price / Performance FPS and wattage into consideration, it's almost a certainty that newer generations will be superior to older generations (i.e., since GPU speed increases at the same price indefinitely from 1 generation to the next).
Essentially, in order for you to make a point, you have to compare similar setups and see the difference in electricity costs. I have gone ahead and done this, as outlined below.
You don't know that. Honestly, you don't. Not everyone buys the latest and the greatest right when it comes out. I for one don't.
I get that. I can tell you that HD6870 for $150 is one of the best bang for the buck cards right based on Price / FPS. The electricity cost differences between an HD6870 and HD6770 won't suddenly make HD6770 more attractive. Just like in 8 months from now, a $350-400 HD7970 isn't going to be a better bang for the buck than a used HD6970 for $180 based on electricity costs.
My point is in North America, electricity cost is a very small fraction of the total ownership cost (bar the extremely power hungry GTX480). From your own graphs it's evident it amounts to
$5-15 annually between a worst and best case scenario (it's even smaller than that).
Look at what happens when you compare apples to apples as a buyer would do today:
.......................
Annual Electricity Costs - using YOUR data:
Single GPUs: Annual electricity costs for comparable single GPUs
Ultra-High End = GTX580 =
+$6.64 over HD6970 but there is already a $100-150 price premium for this card over the HD6970/GTX570. GTX580 users tend to be price inelastic. You think they would care about $7 a year in electricity premium over HD6970 @ 6 hours of gaming/day for 300 days a year!?
High-End = GTX570 vs. HD6970 =
+$2.94 difference
Mid-High-end = GTX560 Ti vs. HD6950 =
+$3.10 difference
Low-Mid-range = GTX460 vs. HD6850 =
+$4.41 difference
Older generation:
HD5870 vs. GTX470 (
+$7.43) but HD5870 cost $350 at the time when GTX470 cost $280-300. So hardly anyone would have chosen the 5870 for electricity "savings". GTX480 cost $500! so hardly anyone who was eyeing it over the $350 HD5870 would have cared either. So again electricity costs between GTX470/480/5870 wouldn't have mattered (heat and noise would have).
Now let's move on to SLI/CF:
Multiple GPUs: Annual electricity costs for comparable Multiple GPU setups
Ultra-High End = GTX580 SLI vs. HD6970 CF =
+$8.48 (When the cash outlay is $850-1000 vs. $700 on AMD side.......electricity cost is irrelevant) < Regardless proper opponent is GTX570 SLI I would say based on price.
High-End = GTX560Ti SLI vs. HD6950 CF = You don't have any data for GTX560 Ti SLI....Ok fair enough.
Let's look at HD6870 CF vs. HD6950 CF vs. HD6970 CF = $59.43 vs. $66.42 (
+$6.89) vs. $78.25 (
+$11.83)
Mid-Range = GTX460 SLI vs. HD6850 CF =
+$6.59 difference
Your own analysis shows that the annual electricity cost difference between comparable setups ranges from about $3-12 per annum.
The only serious outliers are GTX470/480. However, both of those cards were special cases because GTX470 was significantly cheaper than the HD5870 and GTX480 was significantly more expensive than the HD5870 on release. And again, most GTX470/480/5870 users aren't going to side-grade to current generation for electricity savings.