Ok, disclaimers:
Yada yada YMMV yada yada prices are subject to change yada yada not a reflection of RAC yada yada batteries not included yada yada and all the other stuff you guys already know far better than I.
Most info from Seti’s 3rd most important bookmark
http://en.wikipedia.org/wiki/Comparison_of_Nvidia_graphics_processing_units
#1 being the NC forum and #2 our mascot The Cricket
First number (after the GPU number) is GFLOPS. Last number is the whole point of this little exercise and is GFLOPS per US dollar. Prices are conservative (especially for the low end cards) but realistic.
GeForce GT 610 155.5 $40 - 3.8875
GeForce GT 620 268.8 $50 - 5.376
GeForce GT 630 311.0 $60 - 5.183 (DDR3)
GeForce GT 640 691.2 $90 - 7.68 (DDR3)
GeForce GTX 650 812.5 $100 - 8.125
GeForce GTX 650 Ti 1420.8 $150 - 9.472
GeForce GTX 660 1881.6 $230 - 8.181
GeForce GTX 660 Ti 2460 $290 - 8.483
GeForce GTX 670 2460 $370 - 6.648
GeForce GTX 680 3090.4 $460 - 6.718
GeForce GTX 690 2× 2810.88 (5621.76) $1000 - 5.62176 (ouch)
What about Seti’s favourite workhorse, the 560 TI?
(You know… when it’s not spitting out errors faster than Kerouac on Benzedrine)
GeForce GTX 560 Ti 1263.4 $210 - 6.016
What’s that you say? You aren’t getting free electricity? Fair enough … Let’s pretend that it costs you $1.2 per watt per year running 24/7. And that you’ll run the card for 3 years. What then?
GeForce GT 610 155.5 $40 + $104.4 – 1.077
GeForce GT 620 268.8 $50 + $176.4 – 1.187
GeForce GT 630 311.0 $60 + $234 – 1.058
GeForce GT 640 691.2 $90 + $234 – 2.133
GeForce GTX 650 812.5 $100 + $230.4 – 2.459
GeForce GTX 650 Ti 1420.8 $150 + $396 – 2.602
GeForce GTX 660 1881.6 $230 + $504 – 2.563
GeForce GTX 660 Ti 2460 $290 + $540 – 2.964
GeForce GTX 670 2460 $370 + $612 – 2.505
GeForce GTX 680 3090.4 $460 + $702 – 2.660
GeForce GTX 690 5621.76 $1000 + $1080 – 2.703
Again last number is GFLOPS per dollar. Higher is better.
Second $ amount is cost of electricity running 24/7 for 3 years.
And let’s not forget:
GeForce GTX 560 Ti 1263.4 $210 + $612 – 1.537 (ouch)
PS As Murphy would have it, I began to write this right before the power outage and tried to preview it during the outage. Many verbs and nouns followed, none of which suitable for the Boards I’m afraid. Just please show some leniency if I made any mistakes.