I've been trying to figure it out. Google search for hours, but I can not find the answer.

When I GPU mine, my hash rates go from 400/hs to 2000/hs, depending on the coin. What determines this? Is there a calculation I can make per coin to predict what I get?

For then now the only thing I can do is actually start mining to find out the h/s.

Also, if I point a BTC miner to PPC, do I get the same h/s. So if an antminer is rate at 1/ghs for BTC, do I get the same for PPC?

Thanks in advance.