| Bios name | 
       Remarks  | 
| 
       AV40SB04  | 
    Initial release | 
| AV40SB05 |    
         Date code: 07/05/2002 checksum: 5000H 1. Improve P4x266a stability based on VIA's suggestion.  |      
  
| AV40SB06 |    
         Date code: 10/01/2002 checksum: 4200H 1. To support Intel Celeron 2.0G CPU.  |