I heard some talk about 70-100Mh/s aswell, at about 200watts this seems great. But price needs to be around 600$ or under for it to be efficent.
Yepp, you seem rarely misinformed to be a miner.
I don't care where the mining power comes from, most hash per watt wins for me and if VEGA is it i am going for it.
With crypto specific instructions VEGA is partially built to mine, these instructions is only activated in the drivers that the reviewer have right now and are packaged on cd in the VEGA retail boxes.
With the new extreme cache structure, crypto specific instructions and HBM2 a massive increase is possible.
As for power, there should be no problem undervolting gpu and overclock memory, also bet you that the gpu will draw less power using the crypto specific instructions.
AMD is not stupid, they put the crypto instructions in there to make money, if they can't beat nVidia in the gaming market they are going after the mining market and gaming will come second, as simple as that, it's all about the money.
Tell you what i know, if VEGA performs you will definitely be in line with the rest of us buying VEGA

or else u better you stop mining.
Vega's HMB is already overclocked to the max from the factory due to it massively under performing it's spec'd target speeds. I'd be surprised if you can squeeze 5% more out of memory. Your entire post reeks of AMD fanboism. I've own a good 50 AMD cards and dozens of NVIDIA cards over the years. I have no dog in the fight other than I want efficiency and reliability. Vega needs to pull a minimum of 50MH/s in ETH for it to be remotely worth it and I'll be entirely surprised if it comes close at a reasonable rate of power consumption.