My unit's built-in dashboard reports 1600 GH/s. My pool (btcguild) reports about 1580 GH/s. My custom share-logging mining dashboard calculates the hashrate at 1570 GH/s (which is a three hour average based on submitted shares).
So they are all fairly consistent for me.
how are you doing at btcguild? i have never used that pool.
I'm happy with them. I prefer them primarily because they are stable while also being large enough that they don't have massive variance.