i was thinking that the halving would have been useless if bitcoin had risen enormously in value in the past and within the first 3-5 years
but even satoshi didn't believe in it to skyrocket so fast
Are the new chips twice as efficient?
yes they are, s7 is x2 more efficient than the s5 antminer
The quick search on Google reveals that "the S5+ antminer offers nearly 3,000 more GH/s than the announced S7". How's that? Besides, the S5 uses 60 chips per miner while the S7 uses 162, so is this new miner in fact more efficient? Efficiency is not only about power consumption (operating costs), you should also take into account capital expenditures. In this way, if the new miner consumes half but costs twice as much (or even the same if it has the same hashrate), then you would still be less profitable at 12.5 BTC with it than with the old miner at 25 BTC per block per same price...
That's why Bitcoin halving may have devastating effects on its future (too many factors need to be "upgraded")