I used to mine on multipool and the difference is in the shares received. What happens is that when they mine BTC, they don't have enough hash rate to solve blocks. As a result, they act as a proxy between you and another pool. Originally they mined BTC on P2Pool, but due to variance they have changed. I know they have mined at both eligius and ghash.io too. Now because they are a proxy, they submit your shares as their own. So as a result, the pool they mine BTC on gives them higher difficulty shares, because they submit each server as one worker I believe, than you'd receive if you mined with the pool your being proxied to directly. The low difficulty pool is for those that have a lower hash rate so that they aren't trying to solve high difficulty shares. I hope this helps answer your question.
BTW, I know this information is available at least in their thread, if not their website too. You might just have to look for it.
BTW, I know this information is available at least in their thread, if not their website too. You might just have to look for it.
I actually noticed about a week ago that they were mining on Bitminter.
Actually, we didn't change from P2pool because of variance. We were fine with the variance. We changed from p2pool because despite using the fastest processors available, eventually as our hashrate grew, our modified version of p2pool that allowed custom difficulty setting could not keep up with our share volume and our efficiency was suffering.
