Hi, not only to you. I have a HD6870 an hashrate ah ~300. On the site it is shown somehow ~220, to ~350. I think it is normal. The site is calculating somewhere in the middle.
Thanks for your reply. I recognized that calulations are correct. But 'supervising' a bunch of small miners by the provided live stats (my account -> workers seems) not really praticable.
Is there any kind of workaround? Haven't had a closer look at cgminer api but perhaps the bitminter api works better?
The pool API is based on the shares you submit, since that is all the pool knows, so it's accuracy over a short period of time is quite unreliable - finding shares is statistically random.
My cgminer API, on the other hand, reports the counted hashes done by the devices
(or with ICA and MMQ, it counts successful hashes and reasonably accurately estimates valid aborted hashes if configured correctly)