Specification Sheet
Datasheet, Volume 2 of 2 249
MCHBAR Registers
7.88 TURBO—Offset 5F54h
Read/write register to allow MSR/MMIO access to ACPI P-state notify (PCS 33).
Access Method
Default: 0h
Type: MEM
(Size: 32 bits)
Offset: [B:0, D:0, F:0] + 5F54h
3
1
2
8
2
4
2
0
1
6
1
2
8
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
TURBO_ACTIVATION_RATIO_LOCK
RSVD
MAX_NON_TURBO_RATIO
Bit
Range
Default &
Access
Field Name (ID): Description
31
0h
RWS_KL
TURBO_ACTIVATION_RATIO_LOCK: Lock this MSR until next reset
0: unlocked
1: locked
30:8
0h
RO
Reserved (RSVD): Reserved.
7:0
0h
RWS_L
MAX_NON_TURBO_RATIO: Processor will treat any P-state request above this ratio
as a request for max turbo
0 is special encoding which disables the feature.