In BIOS settings under "CPU Voltage Setting" option, why is the adjustable voltage range different to the ones shown in the user manual?

Related Model ( 108 )

GA-K8NNXP (rev. 1.x)
GA-K8N Pro (rev. 1.x)
GA-K8N (rev. 1.x)
GA-K8VNXP (rev. 1.0)
GA-K8VT800 (rev. 1.x)
GA-K8VT800 Pro (rev. 1.0)
GA-K8VT800M (rev. 1.0)
GA-K8S760M (rev. 1.0)
GA-K8NSNXP (rev. 1.x)
GA-K8NS Pro (rev. 1.x)
GA-K8NS (rev. 1.x)
GA-K8NSNXP-939 (rev. 1.x)
GA-K8VM800M (rev. 1.x)
GA-K8NS Ultra-939 (rev. 1.x)
GA-K8NXP-9 (rev. 1.0)
GA-K8NS-939 (rev. 1.x)
GA-K8NXP-SLI (rev. 1.0)
GA-K8NF-9 (rev. 1.x)
GA-K8N Ultra-SLI (rev. 1.0)
GA-K8N Ultra-9 (rev. 1.0)
GA-K8VT890-9 (rev. 1.0)
GA-K8V Ultra-939 (rev. 1.0)
GA-K8VT800 (rev. 2.x)
GA-K8NS Pro-939 (rev. 1.x)
GA-K8U (rev. 1.x)
GA-K8NSC-939 (rev. 1.x)
GA-K8N Pro-SLI (rev. 1.0)
GA-K8A480M-9 (rev. 1.x)
GA-K8NE (rev. 1.x)
GA-K8NMF-9 (rev. 1.x)
GA-K8U-939 (rev. 1.x)
GA-K8VT890 (rev. 1.x)
GA-K8VM800M (rev. 2.x)
GA-K8N-SLI (rev. 1.x)
GA-K8N51PVMT-9 (rev. 1.0)
GA-K8N51GMF-9 (rev. 1.0)
GA-K8NF9 Ultra (rev. 1.x)
GA-K8N51GMF (rev. 1.0)
GA-K8NE (rev. 2.x)
GA-K8NF-9 (rev. 2.x)
GA-K8N51PVM9-RH (rev. 1.0)
GA-K8NF9 Ultra (rev. 2.x)
GA-K8NS (rev. 2.x)
GA-M51GM-S2G (rev. 1.x)
GA-M55plus-S3G (rev. 1.0)
GA-K8N51GMF-RH (rev. 1.0)
GA-M57SLI-S4 (rev. 1.0)
GA-K8N51PVMT-9-RH (rev. 1.0)
GA-K8N51GMF-9-RH (rev. 1.0)
GA-K8NF-9-RH (rev. 2.x)
GA-M59SLI-S5 (rev. 1.0)
GA-K8NE-RH (rev. 2.x)
GA-M55SLI-S4 (rev. 1.0)
GA-M59SLI-S4 (rev. 1.0)
GA-M55S-S3 (rev. 1.0)
GA-K8VM800M-RH (rev. 2.x)
GA-K8VT800-RH (rev. 2.x)
GA-M61PM-S2 (rev. 1.0)
GA-M61VME-S2 (rev. 1.0)
GA-K8VT890-9 (rev. 1.1)
GA-M57SLI-S4 (rev. 1.1)
GA-M55S-S3 (rev. 1.1)
GA-M55plus-S3G (rev. 2.1)
GA-M55plus-S3G (rev. 3.0)
GA-MF3 (rev. 1.0)
GA-M61P-S3 (rev. 1.0)
GA-M61PM-S2 (rev. 2.0)
GA-M61VME-S2 (rev. 2.0)
GA-M55SLI-S4 (rev. 2.0)
GA-M55S-S3 (rev. 2.0)
GA-MA69VM-S2 (rev. 1.0)
GA-M61SME-S2 (rev. 2.x)
GA-M57SLI-DS4 (rev. 2.0)
GA-M57SLI-S4 (rev. 2.0)
GA-MA69G-S3H (rev. 1.0)
GA-M52S-S3P (rev. 1.0)
GA-MA69GM-S2H (rev. 1.0)
GA-M56S-S3 (rev. 1.x)
GA-M52S-S3P (rev. 2.0)
GA-M52L-S3 (rev. 1.x)
GA-M68SM-S2 (rev. 1.0)
GA-M61SME-S2L (rev. 2.0)
GA-M68SM-S2L (rev. 1.0)
GA-M61PME-S2 (rev. 2.x)
GA-MA74GM-S2H (rev. 1.x)
GA-MA74GM-S2 (rev. 1.x)
GA-M52L-S3 (rev. 2.0)
GA-M52L-S3P (rev. 1.0)
GA-M61PME-S2P (rev. 1.0)
GA-MA74GM-S2H (rev. 2.0)
GA-MA74GM-S2 (rev. 2.0)
GA-MA74GM-S2H (rev. 3.0)
GA-MA74GM-S2 (rev. 3.0)
GA-M68M-S2 (rev. 1.0)
GA-MA74GM-S2H (rev. 4.0)
GA-MA74GM-S2 (rev. 4.0)
GA-M61PME-S2P (rev. 1.3)
GA-M52L-S3P (rev. 1.2)
GA-M68M-S2P (rev. 1.0)
GA-MA74GM-S2 (rev. 4.1)
GA-M52L-S3P (rev. 2.0)
GA-MA74GM-S2H (rev. 4.1)
GA-MA74GM-S2H (rev. 4.3)
GA-MA74GM-S2 (rev. 4.3)
GA-M68M-S2P (rev. 2.3)
GA-M52L-S3P (rev. 2.3)
GA-M52L-S3P (rev. 2.4)
GA-MA74GM-S2 (rev. 4.4)

The adjustable voltage range will be different based on the CPU that is installed. Different models of CPU have different adjustable voltage range. The adjustable voltage range which is highlighted in the user manual is just for user reference.