Fanless Power Supply PC Build Guide

Cases|Damping | Do-It-Yourself Systems | Power | Silent PC Build Guides
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System Configuration:

System device listing.

Measurement and Analysis Tools

Our test procedures involve putting the system in various states (idle, playing HD video, CPU stress, CPU and GPU stress) and monitoring system temperatures, power consumption, and noise levels.

Fan Control Setup

Fan control diagram.

The P8P67 has four fan headers, three of which can actually be controlled, and one of which supports only PWM control. The 500 RPM Scythe intake fans didn't require slowing down at all, so we connected one to the full speed PWR_FAN header in the top right corner and ran the second off with the power supply by using an included 3-pin to molex adapter. The Scythe PWM fan was obvious choice for the PWM-only CPU_FAN header, leaving the CHA_FAN1 and CHA_FAN2 headers for the rear Antec fan and the GELID Icy Vision.

Fan control setup.

We relied on Asus' Fan Xpert utility to get a hold of fan speeds; It allows users to alter fan speed behavior with a customizable CPU temperature vs. fan speed graph. We set the CPU fan to increase linearly from 20% at 0°C to 45% at 45°C.

Fan control setup.

The Chassis fan settings which controlled both the rear exhaust and GPU fans had a minimum speed of only 50% so we decided to leave it flat. This was suitable for the included 1000 RPM Antec exhaust fan, but proved to be unnecessarily high for the GPU Cooler. The GELID Icy Vision is an outstanding heatsink, requiring very little airflow to produce excellent results so we supplemented the motherboard fan control with a Zalman Fan Mate to make it as quiet as possible.

Asus PC Probe readout.

According to Asus' PC Probe utility, on load our final fan speeds were ~810 RPM for the CPU fan (45% setting), ~560 RPM for the rear exhaust fan (50% setting), and ~530 RPM for our front intake fan (full speed). The GPU fan rat at ~1300 RPM (50% setting) but we dialed the knob of the Zalman Fan Mate back to bring it down to ~1060 RPM. PC Probe only displays the CPU and motherboard (PCH) temperatures so we also used SpeedFan which recognized thermal sensors on the SSD and HDD.

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