Depends which SB - they don't share the same power requirements. Look at the PSU and it will tell you. But be prepared. I tried to use a different PSU for my SB500 because of an instability problem with RF interference (see elsewhere), but the SB refused to boot up. I think the voltage needs to be exactly right before it will open up. Maybe the level of regulation as well - amount of AC ripple left on the supply.