Bigger pig farm = better performance.
That could work too.
>the equipment that ultimately shuts down represents a smaller hashrate.
Doesn't follow at all. Let's say the majority of mining gear today is mining 1 BTC @ cost of .7 BTC.
When teh Halvening cometh, that majority will [likely] shut down*
It doesn't go that way.
https://news.bitcoin.com/bitfury-unveils-fastest-bitcoin-mining-chip-ever-created/Let's assume the article is generally correct.
Let's assume that in the year 2015 all bitcoins are mined by 28nm bitfury chips
Let's assume that the entire 2015 network made up of 28nm bitfury chips gave us 100 petahash.
Going to 2016:
Let's assume 40% of the miners have upgraded to the 16nm bitfury chips which are 4x faster for the same watts.
Now, when the 40% upgraded their mining operations, their 40 petahash became 160 petahash for the same watts.
The other 60% which did not upgrade, still have their ....60 petahash.
So in this scenario, the "to-be-retired" hardware will represent only 60 out of a total 220 petahash - even though they are 60% of the machines.
To make it more factual: All this hashpower that has been added in the last few months, well... it ain't from crap equipment.
Mar 18 2016 165,496,835,118 4.46% 1,184,672,491 GH/s
Mar 04 2016 158,427,203,767 -3.10% 1,134,066,098 GH/s
Feb 19 2016 163,491,654,909 13.44% 1,170,318,852 GH/s
Feb 07 2016 144,116,447,847 20.06% 1,031,625,717 GH/s
Jan 26 2016 120,033,340,651 5.89% 859,232,121 GH/s
Jan 13 2016 113,354,299,801 9.12% 811,421,684 GH/s
Dec 31 2015 103,880,340,815 11.16% 743,604,444 GH/s
Dec 18 2015 93,448,670,796 18.14% 668,931,642 GH/s
Dec 06 2015 79,102,380,900 8.77% 566,236,898 GH/s
Nov 24 2015 72,722,780,643 10.44% 520,569,941 GH/s
Nov 11 2015 65,848,255,180 5.77% 471,360,171 GH/s
Oct 29 2015 62,253,982,450 2.25% 445,631,364 GH/s
We've gone 3x in hashpower in just 5 months. These two thirds of the current hashpower that have added 800mn GH/s over the 400mn that we already had, are not from obsolete equipment that will go offline post-halving.
Again, what is different? The gold miner without a staked claim (exclusive rights to the spot he mines), is subject to poor godless savages swarming in & mining the shit out of his spot. That is the case for Bitcoin -- everyone is competing for the same *cough* "digital gold"
The point was that these large mega-dredges don't need separate bulldozers, rock trucks, loaders, excavators, sluice plants etc etc. They just process the dirt on the spot, thus eliminating tremendous fuel costs. They process a lot of yards and do so more economically. And as fuel costs go up, so can the savings increase.