amazon warehouse deals has a bunch of 7970's @ $250 right now
i guess i could take a kill-a-watt to that computer, leave it for about an hour w/ just one gfx card and idling.... then put in the other cards, start them all mining, leave it there for 24 hrs.. then that reading should be 99% accurate. i guess if you have a motherboard that has an onboard gpu, it'd be a bit less watts (re: i'd have to have one 7790 in there for my computer to work. i don't imagine they use much idling though)
Yeah, that would be a probably fantastically accurate reading...for YOUR setup. The problem is even if you know that with your PSU, motherboard, & card/cooling setup, you can run @ 315 KH/s on LTC for 86 W per card, for a 24hr average of 3.6628 KH/s/W ...if I live in a cold climate, or have a slightly more efficient PSU, or if my driver setup is slightly worse or slightly better, or if my motherboard is mismanaging my power or whatever, let's say I do the same test and I get 307 KH/s/W @ 91 W per card for a total of 3.3736 KH/s/W... or I could get 320 KH/s @ 80 W for 4(!!!) KH/s/W.
Once you have your own rig up and running and have done your own measurements you can surely get super-accurate numbers on your own rig. But this chart is mainly for helping compare cards and setups that you don't actually have hands-on with, so that you can try to determine possible average performance and effectiveness of different setups before purchasing.
Don't get me wrong though - I'd be super-interested in your numbers and your settings.
Sorry I didn't mean to be rude. I just pointing out the fact that the data are mostly useful for you and the people in your area.
The good point is that we can update the data ourselves so the most important part for us is the worksheet calculation and presentation in itself.
No real harm done. Sorry for the somewhat harsh response. Just been real busy lately and it was frustrating to get that sort of reply when I spent a good portion of the small amount of free-time I have right now to do that.
Yeah, the spreadsheet is linked in the OP, so if you need to update pricing, or even change to a different currency or something, you can definitely do so.