Did you try the Overclock.net thread? They might someone there who has your batch number. In general as you can gather from the data on hardforum, you should be able to get 4.0-4.2GHz on most 930s assuming your chip is not a dud and you have good cooling.
![[H]ard|Forum](/styles/hardforum/xenforo/logo_dark.png){kind=logo}