If it is then your bios is incorrectly setting it......
http://www.amdcompare.com/us-en/desktop/Default.aspx
Compare OPN (Tray) Processor Model DESC Frequency Socket Voltage Wattage
ADA4800DAA6CD AMD Athlon 64 X2 Dual-Core 4800+ 2400Mhz Socket Socket 939 1.35-1.40 V 110W View Details
ADA4600DAA5CD AMD Athlon 64 X2 Dual-Core 4600+ 2400Mhz Socket Socket 939 1.35-1.40 V 110W View Details
ADA4600DKA5BV AMD Athlon 64 X2 Dual-Core 4600+ 2400Mhz Socket Socket 939 1.35-1.40 V 110W View Details
ADA4400DAA6CD AMD Athlon 64 X2 Dual-Core 4400+ 2200Mhz Socket Socket 939 1.35-1.40 V 110W View Details
ADA4200DKA5BV AMD Athlon 64 X2 Dual-Core 4200+ 2200Mhz Socket Socket 939 1.35-1.40 V 89W View Details
ADA4200DAA5CD AMD Athlon 64 X2 Dual-Core 4200+ 2200Mhz Socket Socket 939 1.35-1.40 V 89W View Details
ADA3800DKA5BV AMD Athlon 64 X2 Dual-Core 3800+ 2000Mhz Socket Socket 939 1.35-1.40 V 89W View Details
ADA3800DAA5CD AMD Athlon 64 X2 Dual-Core 3800+ 2000Mhz Socket Socket 939 1.35-1.40 V 89W View Details