new to using cudaminer ..
as an example, if i have 3 cards running at 300khash, does the total of 900khash get reported to a mining pool?
or does a pool/worker read it as 300khash per card, as the share is accepted by the pool?
A pool only sees the shares you submit, and can guesstimate your hashrate from that. It's not very accurate and you shouldn't pay much attention to it unless it's VERY far off.