This might help.
LINK
A7A266 The following table shows the support for CPU / Motherboard
CPU
Since PCB
Since BIOS
Note
Athlon 1000 (200 MHz FSB) ALL ALL
Athlon 1000 (266 MHz FSB) ALL ALL
Athlon 1100 (200 MHz FSB) ALL ALL
Athlon 1133 (266 MHz FSB) ALL ALL
Athlon 1200 (200 MHz FSB) ALL ALL
Athlon 1200 (266 MHz FSB) ALL ALL
Athlon 1300 (200 MHz FSB) ALL ALL
Athlon 1333 (266 MHz FSB) ALL ALL
Athlon 1400 (200 MHz FSB) ALL 1006
Athlon 1400 (266 MHz FSB) ALL 1006
Athlon 700 ALL ALL
Athlon 750 ALL ALL
Athlon 800 ALL ALL
Athlon 850 ALL ALL
Athlon 900 ALL ALL
Athlon 950 ALL ALL
Athlon XP 1500+(Model 6)(Palomino) 1.10 1008
Athlon XP 1600+(Model 6)(Palomino) 1.10 1008
Athlon XP 1700+(Model 6)(Palomino) 1.10 1008
Athlon XP 1700+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 1800+(Model 6)(Palomino) 1.10 1008
Athlon XP 1800+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 1900+(Model 6)(Palomino) 1.10 1008
Athlon XP 1900+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 2000+(Model 10)(Thorton) 1.10 1012
Athlon XP 2000+(Model 6)(Palomino) 1.10 1008
Athlon XP 2000+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 2100+(Model 6)(Palomino) 1.10 1008
Athlon XP 2100+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 2200+(Model 10)(Thorton) 1.10 1012
Athlon XP 2200+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 2400+(Model 10)(Thorton) 1.10 1012
Athlon XP 2400+(Model 8)(Thoroughbred) 1.10 1012
Athlon XP 2600+(266FSB)(Model 8)(Thoroughbred) 1.10 1012
Duron 1000 (Model 7)(Morgan) 1.10 1008B
Duron 1100 (Model 7)(Morgan) 1.10 1008B
Duron 1200 (Model 7)(Morgan) 1.10 1008B
Duron 1300 (Model 7)(Morgan) 1.10 1008B
Duron 1400 (Model 8)(Applebred) 1.10 1013.001
Duron 1600 (Model 8)(Applebred) 1.10 1013.001
Duron 1800 (Model 8)(Applebred) 1.10 1013.001
Duron 600 (Model 3) ALL ALL
Duron 650 (Model 3) ALL ALL
Duron 700 (Model 3) ALL ALL
Duron 750 (Model 3) ALL ALL
Duron 800 (Model 3) ALL ALL
Duron 850 (Model 3) ALL ALL
Duron 900 (Model 3) ALL ALL
Duron 900 (Model 7)(Morgan) 1.10 1008B
Duron 950 (Model 3) ALL ALL
Duron 950 (Model 7)(Morgan) 1.10 1008B