The Power Saving Guide

Component Power Requirements

The following table is based on numbers that we’ve collected in our test lab. The power supply power requirements refer to the heat dissipation, which all power supply units struggle with. The better the PSU efficiency, the less power it will convert into heat. The motherboard requirement summarizes the requirements for all motherboard components such as Northbridge, Southbridge, additional controllers and voltage regulators, as well. Processor and memory power requirements depend directly on the motherboard, as the efficiency of voltage regulators has an impact as well. The table does not include dual graphics setups ; these would increase the requirements even more.

Component Best Case Worst Case
Power Supply 5-15 W 40-60 W
Motherboard 10-15 W 30-50 W
Processor 12-30 W 60-120 W
RAM 5-15 W 30-50 W
Hard Drive 3-5 W (2.5") 10-15 W (3.5")
Graphics Card (single) 3-10 W (integrated) 25-180 W (PCI Express)
Total 38-90 W 195-475 W

Test Setup

We used a rather conventional Intel Core 2 system with a P965 motherboard from Gigabyte :

System Hardware
Socket 775 Intel Core 2 Extreme X6800 (Conroe 65 nm, 2.93 GHz, 4 MB L2 Cache)
Motherboard Gigabyte 965P-DQ6
Chipset : Intel P965, BIOS : F10
Common Hardware
RAM I 2x 1024 MB DDR2-800 (CL 4.0-4-4-12)
Corsair CM2X1024-6400C3 XMS6403v1.1
RAM II 4x 512 MB DDR2-800 (CL 4.0-4-4-12)
Corsair CM2X512-8500C5 XMS85053v1.1
Graphics Card Zotac 8800GTS
GPU : Nvidia GeForce 8800 GTS (500 MHz)
RAM 320 MB GDDR3 (1200 MHz)
Hard Drive I 750 GB, 7,200 RPM, 8 MB Cache, SATA/300
(System + Replacement)
Seagate Barracuda ES
Hard Drive II 100 GB, 7,200 RPM, 2 MB Cache, UltraATA/100
Western Digital WD1000BB
Hard Drive III 120 GB, 7,200 RPM, 8 MB Cache, UltraATA/100
Seagate Barracuda 7200.7
Hard Drive IV 160 GB, 7,200 RPM, 8 MB Cache, SATA/150
Seagate Barracuda 7200.7
PSU Skyhawk Power One 600W GM570PC
Nvidia Graphics Forceware158.22
Intel Chipset Version
DirectX Version : 9.0c (4.09.0000.0904)
OS Windows XP, Build 2600 SP2
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