Hard question : Mining pool and 2 different miners --> same shares if same work?

[stigo]

Hello,

I didn't find answers to my questions on the web or the bitcointalk pools forum , can you help please :

I know that a pool will not send the same work to different miners .

SUPPOSE there are two antminers S9i ( for example)  mining on a pool

SUPPOSE that the pool sends the same work to these miners and the difficulty is the same for both.

-Will the miners' shares be exactly the same in this case ? (I mean with the same delays and hashes)


Now suppose that the pool REsends the same work to an antminer

-Will the shares be exactly the same as before ? (I mean with the same delays and hashes)



Thanks

[kano]

If the work generator software is coded badly and doesn't give a different stratum coinbase sig to two different miners, then they will probably mine some of the same results.

If the two miners are exactly the same firmware and hardware, then giving two miners the same work will produce some of the same results.
They will not always produce exactly the same results, since the two miners will not mine at exactly the same hash rate and exactly the same CPU clocks getting exactly the same time between generating internal work.
But typically one would do more work and the other slower one would do a less amount of work that overlaps from the start of the faster miner.

P.S. since you included the term "Pool" in the header. No that wont happen unless the pool doesn't know what they are doing.

[stigo]

If the work generator software is coded badly and doesn't give a different stratum coinbase sig to two different miners, then they will probably mine some of the same results.

If the two miners are exactly the same firmware and hardware, then giving two miners the same work will produce some of the same results.
They will not always produce exactly the same results, since the two miners will not mine at exactly the same hash rate and exactly the same CPU clocks getting exactly the same time between generating internal work.
But typically one would do more work and the other slower one would do a less amount of work that overlaps from the start of the faster miner.

P.S. since you included the term "Pool" in the header. No that wont happen unless the pool doesn't know what they are doing.

Thanks