Yeah, it goes up to 6400dpi. I tend to keep it at about 4000 but I have only had it for a day and only played one game (Spec Ops: The Line) with it. Gonna play some CS:GO tonight to test it some more. One thing I really hate about it is the charger dock/wireless transmitter uses the same cable as the mouse (it can be both wired and wireless. It uses a standard USB Mini end but its designed to not allow any other USB Mini plugged in. I hacked together one to plug into the dock since it will never move and used the cord it came with for the mouse when I want it wired. However, the software goes apeshit if it detects the mouse and dock both plugged in at the same time. The only time I want it wired is when I am playing and the battery dies. That way I can play and charge at the same time. Originally my plan was to keep it wired at home and take it and the receiver with me to work and school but since the dock is also the receiver, it isn't feasible. Oh well, I love the mouse so far.
Ah, I've got the Razer Abyssus, it only goes up to 3500 DPI and I get the choice between 125 Hz and 1K Hz. I use 1K Hz and 1650 DPI though, it's am ambidex mouse so it works fine for both me and my sister (she has this thing about using my computer).