Gentlemen and Ladies,

I am new so forgive this being a stupid question...

I have a dragon that shows as 1020 ish ghps on btcguild, but when I point it at bitminter it shows as 724 ish.  Consistently!  Am I doing something wrong?  I'm using http://mint.bitminter.com:3333 ( I tried using the 8332 port but it simply wouldn't connect) with the standard difficulty.  

I should say that I have quite a few antminer S1's also pointed at bitminter and their hash rates as depicted on bitminter are much closer to the rates show in on each individual machine.

help?