Stale shares on pool equal to pool's difficulty setting

[or.karlinsky]

Hi everyone,

I have a 200GHs AntMiner (overclocked from 180GHs) and I mine at GHash.IO.
At first the graph showed me a lot of Low Difficulty shares so I changed the difficulty to 200.
After that I started seeing Stale Shares in the graph, either 200 or 600 per hour (not all hours, some had 0). I then lowered it to 190 and the stale shares lowered to 190/380 (again, not all of them, some hours had 0). I lowered again to 185 and then the stale shares were 185/370 per hour (some hours were 0). As you can see the stale shares are multiples of the difficulty setting.

Why is this happening? Is it normal? Is there something I can do? What difficulty do you recommend me to set?

Thanks in advance!

[Meuh6879]

change pool for 7 days and compare ... like http://mining.bitcoin.cz/ for example.
staled share only append when new block is created by bitcoin network (only 1 or never every block create for me on a 12GH/s).

note : i have a 10-11 difficulty for my 12GH/s ... on slush pool.
you have a problem with your 180GH/s and 380 difficulty 

[-ck]

Normal. It rejects as many effective shares as it would have accepted had the shares been acceptable, which is based on diff.

[or.karlinsky]

ckolivas - Which difficulty do you recommend me to set in the pool? 200/190/185/lower?

[-ck]

It makes no difference in the end. It averages out to the same. The only thing I'd recommend is not mining at ghash.io

[byt411]

It makes no difference in the end. It averages out to the same. The only thing I'd recommend is not mining at ghash.io

And not BTC Guild either. Point at smaller pools.