Re: Nvidia more efficient to mine scrypt?

So:

$150 to mine 245kh? <-- nVidia
$320 to mine 700kh? <-- AMD 280x

How is that better? I dont get it.

$35-40 to mine 200-210kh <---- used 5770s. Every one of them I have (5) mine at 850+core/1200 RAM @ 1.000 volts.