GPU Clock Control Interface

Data Structures
struct	NV_GPU_CLOCK_FREQUENCIES_V1
struct	NV_GPU_CLOCK_FREQUENCIES_V2

Macros
#define	NV_GPU_CLOCK_FREQUENCIES_VER_1   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V1,1)
#define	NV_GPU_CLOCK_FREQUENCIES_VER_2   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V2,2)
#define	NV_GPU_CLOCK_FREQUENCIES_VER_3   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V2,3)
#define	NV_GPU_CLOCK_FREQUENCIES_VER   NV_GPU_CLOCK_FREQUENCIES_VER_3

Typedefs
typedef enum _NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID	NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID
typedef enum _NV_GPU_PUBLIC_CLOCK_ID	NV_GPU_PUBLIC_CLOCK_ID
typedef NV_GPU_CLOCK_FREQUENCIES_V2	NV_GPU_CLOCK_FREQUENCIES

Enumerations
enum	_NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID { NVAPI_GPU_PERF_VOLTAGE_INFO_DOMAIN_CORE = 0 , NVAPI_GPU_PERF_VOLTAGE_INFO_DOMAIN_UNDEFINED = NVAPI_MAX_GPU_PERF_VOLTAGES }
enum	_NV_GPU_PUBLIC_CLOCK_ID {   NVAPI_GPU_PUBLIC_CLOCK_GRAPHICS = 0 , NVAPI_GPU_PUBLIC_CLOCK_MEMORY = 4 , NVAPI_GPU_PUBLIC_CLOCK_PROCESSOR = 7 , NVAPI_GPU_PUBLIC_CLOCK_VIDEO = 8 ,   NVAPI_GPU_PUBLIC_CLOCK_UNDEFINED = NVAPI_MAX_GPU_PUBLIC_CLOCKS }
enum	NV_GPU_CLOCK_FREQUENCIES_CLOCK_TYPE { NV_GPU_CLOCK_FREQUENCIES_CURRENT_FREQ = 0 , NV_GPU_CLOCK_FREQUENCIES_BASE_CLOCK = 1 , NV_GPU_CLOCK_FREQUENCIES_BOOST_CLOCK = 2 , NV_GPU_CLOCK_FREQUENCIES_CLOCK_TYPE_NUM = NV_GPU_MAX_CLOCK_FREQUENCIES }

Functions
NVAPI_INTERFACE	NvAPI_GPU_GetAllClockFrequencies (__in NvPhysicalGpuHandle hPhysicalGPU, __inout NV_GPU_CLOCK_FREQUENCIES *pClkFreqs)
#define	NVAPI_MAX_GPU_CLOCKS   32
#define	NVAPI_MAX_GPU_PUBLIC_CLOCKS   32
#define	NVAPI_MAX_GPU_PERF_CLOCKS   32
#define	NVAPI_MAX_GPU_PERF_VOLTAGES   16
#define	NVAPI_MAX_GPU_PERF_PSTATES   16

Detailed Description

The GPU clock control APIs are used to get and set individual clock domains on a per-GPU basis.

Macro Definition Documentation

NV_GPU_CLOCK_FREQUENCIES_VER

#define NV_GPU_CLOCK_FREQUENCIES_VER   NV_GPU_CLOCK_FREQUENCIES_VER_3

NV_GPU_CLOCK_FREQUENCIES_VER_1

#define NV_GPU_CLOCK_FREQUENCIES_VER_1   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V1,1)

NV_GPU_CLOCK_FREQUENCIES_VER_2

#define NV_GPU_CLOCK_FREQUENCIES_VER_2   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V2,2)

NV_GPU_CLOCK_FREQUENCIES_VER_3

#define NV_GPU_CLOCK_FREQUENCIES_VER_3   MAKE_NVAPI_VERSION(NV_GPU_CLOCK_FREQUENCIES_V2,3)

NVAPI_MAX_GPU_CLOCKS

#define NVAPI_MAX_GPU_CLOCKS   32

NVAPI_MAX_GPU_PERF_CLOCKS

#define NVAPI_MAX_GPU_PERF_CLOCKS   32

NVAPI_MAX_GPU_PERF_PSTATES

#define NVAPI_MAX_GPU_PERF_PSTATES   16

NVAPI_MAX_GPU_PERF_VOLTAGES

#define NVAPI_MAX_GPU_PERF_VOLTAGES   16

NVAPI_MAX_GPU_PUBLIC_CLOCKS

#define NVAPI_MAX_GPU_PUBLIC_CLOCKS   32

Typedef Documentation

NV_GPU_CLOCK_FREQUENCIES

typedef NV_GPU_CLOCK_FREQUENCIES_V2 NV_GPU_CLOCK_FREQUENCIES

Used in NvAPI_GPU_GetAllClockFrequencies()

NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID

typedef enum _NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID

NV_GPU_PUBLIC_CLOCK_ID

typedef enum _NV_GPU_PUBLIC_CLOCK_ID NV_GPU_PUBLIC_CLOCK_ID

Enumeration Type Documentation

_NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID

enum _NV_GPU_PERF_VOLTAGE_INFO_DOMAIN_ID

Enumerator
NVAPI_GPU_PERF_VOLTAGE_INFO_DOMAIN_CORE
NVAPI_GPU_PERF_VOLTAGE_INFO_DOMAIN_UNDEFINED

_NV_GPU_PUBLIC_CLOCK_ID

enum _NV_GPU_PUBLIC_CLOCK_ID

Enumerator
NVAPI_GPU_PUBLIC_CLOCK_GRAPHICS
NVAPI_GPU_PUBLIC_CLOCK_MEMORY
NVAPI_GPU_PUBLIC_CLOCK_PROCESSOR
NVAPI_GPU_PUBLIC_CLOCK_VIDEO
NVAPI_GPU_PUBLIC_CLOCK_UNDEFINED

NV_GPU_CLOCK_FREQUENCIES_CLOCK_TYPE

enum NV_GPU_CLOCK_FREQUENCIES_CLOCK_TYPE

Used in NvAPI_GPU_GetAllClockFrequencies()

Enumerator
NV_GPU_CLOCK_FREQUENCIES_CURRENT_FREQ
NV_GPU_CLOCK_FREQUENCIES_BASE_CLOCK
NV_GPU_CLOCK_FREQUENCIES_BOOST_CLOCK
NV_GPU_CLOCK_FREQUENCIES_CLOCK_TYPE_NUM

Function Documentation

NvAPI_GPU_GetAllClockFrequencies()

NVAPI_INTERFACE NvAPI_GPU_GetAllClockFrequencies	(	__in NvPhysicalGpuHandle	hPhysicalGPU,
		__inout NV_GPU_CLOCK_FREQUENCIES *	pClkFreqs
	)

This function retrieves the NV_GPU_CLOCK_FREQUENCIES structure for the specified physical GPU.

For each clock domain:

• bIsPresent is set for each domain that is present on the GPU
• frequency is the domain's clock freq in kHz

Each domain's info is indexed in the array. For example: clkFreqs.domain[NVAPI_GPU_PUBLIC_CLOCK_MEMORY] holds the info for the MEMORY domain.

SUPPORTED OS: Windows 7 and higher

TCC_SUPPORTED

Since

Release: 295

Returns

This API can return any of the error codes enumerated in NvAPI_Status. If there are return error codes with specific meaning for this API, they are listed below.

Return values

NVAPI_INVALID_ARGUMENT

pClkFreqs is NULL.