SIGs/PowerManagementHWtable

From FedoraProject

Jump to: navigation, search

Contents

Power consumption of hardware components



  • Please, feel free to add missing information if you find out new one.
  • The table is appropriately descending sorted (sort key is power consumption)


Component Manufacturer Series Cons.[W] on/off Save % Remarks
GPU nvidia GT9600 96 Y 650/1625 MHz
nvidia GT9600 59 Y 600/1500 MHz
nvidia GT9800X 140 Y 675/1688 MHz
Graphics cards nvidia GT9800X 175 Y
ati HD4870 200 Y
ati HD3870 130 Y
CPU Intel ATOM Z, N 2-2.4 N
ATOM 230 4 N
ATOM 330 8 N
Core2 Mobile Extreme 45 N
Core2 Mobile Quad 95 N
Core2 Mobile Duo 10-35 N
Core2 Extreme 75-150 N
Core2 Quad 95 N
Core2 Duo 65 N
AMD Athlon II X2 65, 65, 80 N 2.9, 3.0, 3.1 GHz
Phenom II X3 95 N
Phenom II X4 65-125 N 2.5 - 3.2 GHz
Turion N mobile
Monitors 17" 27 Y
19" Y
20" Y
22" 34 Y
24" Y
Motherboard 5-50 N
Chipset nvidia N
intel
HDD 3.5 SATA 5-14 Y idle and load of common disks
HDD 3.5 SATA PM WD GP and Green 3-7 Y dynamic spin
HDD 2.5 SATA 0.6-2.2 Y idle and load
SSD 2.5 SATA 1.4-1.6 Y no difference between idle and load
SSD 1.8 SATA Samsung 0.7 Y avarage power consumption
Memory N
Wifi Y
Bluetooth Y


Comments to the components

CPU

The CPUs are one of the biggest power consumer. We should focus on more effective code (code consumes less CPU-time) what will affects power consumption of processors. On the other side it will improve performance on computers containing low energy processors (e.g. Atom).

Graphics cards

The graphics cards (GC) are the main power consumer in desktops. This points to huge potentials to save power. Matthew Garret did changes to some F11 drivers to be power saving:

  • LVDS re-clocking - which basically reduces the refresh rate of the display when the screen is idle for LCD displays (this works without any visual impact as the refresh rate is reset as soon as there is activity)
  • GPU clock reduction that's in the intel and ati driver. This reduces GPU clock if there is no 3d activity
  • GPU powerdown

Motherboard and Memory

Motherboards, memory and bus are not investigated yet ...

Disks

HDD - the HW table has discovered the disks are more less behind our focus. The HW manufacturers solve PM in the firmware (e.g. GP and Green series of Western Digital). The WD disks of GP and Green series adjust dynamically spin dependent on load to save power.

We are able to optimize number of i/o operations and spin down the disk (no info what causes APM values 128-254 - see hdparm -B). There is no more things to do.

HDD versus SSD - Comparison of power consumption HDD and SSD disk doesn't prioritize SSD disks. You can read on Tom's hardware sites.