Re: [2018-02-12]Bitmain To Release Ethereum ASIC Miner F3 With 72Gb DDR3 Dram In Q2
DDR3 is pretty slow for ETH mining, look at the GDDR5X it's slower than GDDR5 and DDR3 is way slower for mining, but it would be probably cost effective with those DDR3, seems like DDR4 are too expensive that's plus.
true about gddr3 however 5x can work good 
1070 with custom bios and 4GB (512MB per chip) Micron GDDR5X giving over 40MH/s with same 256bit bus