Why GPU clock is so low?

Accelerated Computing CUDA CUDA Programming and Performance
1

The output of prop.clockRate is only 1MHz. This is way below in the spec. Is this normal? Thanks.

— General Information for device 0 —
Name: Quadro FX 580
Compute capability: 1.1
Clock rate: 1125000
Device copy overlap: Enabled
Kernel execution timeout : Enabled
— Memory Information for device 0 —
Total global mem: 521732096
Total constant Mem: 65536
Max mem pitch: 2147483647
Texture Alignment: 256
— MP Information for device 0 —
Multiprocessor count: 4
Shared mem per mp: 16384
Registers per mp: 8192
Threads in warp: 32
Max threads per block: 512
Max thread dimensions: (512, 512, 64)
Max grid dimensions: (65535, 65535, 1)

2

CU_DEVICE_ATTRIBUTE_CLOCK_RATE: Peak clock frequency in kilohertz;

You gotta multiply that by 1000.