I'm building a machine this week that I should be able to get about 200 MH/s out of the gpu. Is that enough to mine on the p2p pool and do I need to do anything to up the difficulty of submitted shares or is it just a luck thing?
It depends on how quickly you wish to get paid. If you don't mind be paid once per month then you may use p2pool solo. If you would prefer to recieve smaller rewards, but more often - you can use some sub-pools that share reward.
In long run total sum will be the same.
It's not luck but rather statistic
