470 pulls around 100 total and gets close to 200. Yes that makes the 460 look more efficient but you will have to build more rigs to hold the same amount of hashing power. This becomes more expensive as you have to buy CPU, Memory MB PSU for each one. 470 or 480 is a better choice for that reason alone.
rx470 4gb with current available miner cannot do 200sols@100watt. No way!rx470 with samsung 8gb ram - maybe - but with extreme luck if you find chip that can do [email protected] ))
Meh, all my 8Gbs do 165, the 4Gb are close at 150. 200 sols may be possible if you overclock like crazy, but that means you would have free juice.
my rx470 with samsung 8gb ram = 197-199 Sol/s (Win7x64, last driwers, Claymore v8.0, OC 1360/2100, avr 125W)
PanneKopp 
