i dont see how s7 keeps being more profitable then s9.
Here is a very simplified example (with totally fictional numbers, just for convenience of understanding):
First of all, one GH of SHA256 power is one GH of SHA256 power. So it doesn't matter which type of machines are producing these, be them S7's or S9's or even a truckload of USB-devices.
Now, let's say you have 1 BTC to spend, and:
- S7 hashes cost 0.01 per GH
- S9 hashes cost 0.025 per GH
- maintenance on S7 hashes cost 0.005 per GH
- maintenance on S9 hashes cost 0.01 per GH
For your 1 BTC, you could purchase a total of:
- 100 GH of S7 power, or
- 50 GH of S9 power
This translates into the maintenance for them as following:
- 100 GH of S7 power, costs 0.5 on maintenance (100 x 0.005)
- 50 GH of S9 power, costs 0.2 on maintenance (20 x 0.01)
Now, as said before, a GH is a GH. And let's say that a single GH yields 0.02. Now you get:
- 100 GH of S7 power, yields a 2.00
- 50 GH of S9 power, yields a 1.00
Then, there's the maintenance to deduct:
- 100 GH of S7 power, yielding 2.00, minus the 0.5 maintenance, is netting a 1.5
- 50 GH of S9 power, yielding 1.00, minus the 0.2 maintenance, is netting a 0.8
===> Result: The
S7's yield 0.7 more than the
S9's.
Again, the above numbers are
totally fictional, and are only meant to explain on why
currently the S7 are more profitable than S9 hashes.
but i dont see the difference between hash making difference on the next stage of difficult (+7.06%)
Another very simplified example with totally fictional numbers:
For convenience, we take the same numbers as the example earlier given. But, for easy convenience, let's say that the difficulty will increase with 100%. Now, you get:
- maintenance on S7 hashes cost
0.005 0.01 per GH (100% increase!)
- maintenance on S9 hashes cost
0.01 0.02 per GH (100% increase!)
This translates into the maintenance for them as following:
- 100 GH of S7 power, costs
0.5 1.0 on maintenance (100 x
0.005 0.01)
- 50 GH of S9 power, costs
0.2 0.4 on maintenance (20 x
0.01 0.02)
The maintenance to deduct:
- 100 GH of S7 power, yielding 2.00, minus the
0.5 1.0 maintenance, is netting a
1.5 1.0
- 50 GH of S9 power, yielding 1.00, minus the
0.2 0.4 maintenance, is netting a
0.8 0.6
===> Result: The
S7's yield 0.7 0.4 more than the
S9's.
Now next, for example, if you take a 300% increase, then the results on
S7's would be 0, whilst the results on the
S9 would still be a positive 0.2I hope you are starting to get the picture?