Is that actually HPM, as in hashes per minute, or collisions per minute (which coyote miner prints as hpm for some reason)?
Coyote: collisions per minute reported as hpm (at least on github which is 12 days old! - the binary probably multiplies this by 2 also, otherwise coyote miner would be two times slower)
Beeer and ypool: collisions per minute * 2 reported as col/m
Which one is it?
edit:
http://bitsharestalk.org/index.php?topic=965.0Ok, so 520HPM is impossible on amazon instance. So it's actually col/m*2 for all public miners.
So unless you specifically modified a miner to report true hpm you're getting 500 col/m. Did you?