In Canada: Stealth 100 by Anitec Computers

SPCR Certified Silent PCs
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Tests with a Production Sample


Very tidy cable management for maximum cooling airflow efficiency.

Configuration:

  • Antec New Solution NSK3480 MicroATX Mini Tower Case
  • Asus M2A-VM - AMD 690G (Athlon64/X2/FX/Sempron) PCI-E Socket AM2
  • AMD Athlon X2 BE-2350 (2.1 GHz) Dual-Core Socket AM2 Processor
  • Corsair VX Series 450W Power Supply
  • Western Digital Cavier Green Power GP750GB - SATA 3Gb/s Hard Drive
  • Scythe Slipstream 120mm (800rpm) Fan
  • Scythe Ninja Plus Rev. B - 6 Heat Pipe CPU Cooler with 120mm Fan
  • Asus Asus DRW-2014L1T (Black) 18x SATA DVD±Writer
  • OCZ 1GB x2 OCZ2SE8001GPC2-6400 DDR2 DIMM (2 GB total)
  • Vantec All-in-1 Internal USB 2.0 Card Reader

The system came with Windows XP Home installed, with these settings engaged:

  • Minimal Power Management (with AMD's Cool 'n' Quiet)
  • S3 Standby mode (20 minutes delay)
  • Asus "Q-Fan" thermal fan speed controller enabled

Temperature, noise and AC power consumption were measured under various loads in ambient conditions of ~19 dBA and 21°C.

Activity
CPU
HDD
Fan RPM
SPL
dBA@1m
AC Power
standby
-
-
-
silent
2-3W
idle
22°C
31°C
500
21-22
40W
full load
(RTHDRIBL and CPUBurn x2)
53°C
32°C
630
22
87W

All the temperatures were very low. The measured SPL never changed, and this reflects the subjective experience: The computer always sounds the same. The noise can be described as a soft wooshing. A bit of muted clicking noise is also audible when the hard drive is seeking, which explains the 21~22 dBA SPL in idle — it's the effect of Windows accessing the drive occasionally. When the computer is placed under the desk as is the norm for most vertical systems, it becomes essentially inaudible (unless your ambient noise level is significantly lower than mine).

Because the speed of the main chamber fan is thermally controlled, a check was made of acoustics at a much higher ambient temperature, to simulate hot summer conditions. A 900W radiant space heater was placed about two feet diagonally in front of the PC and left for nearly an hour with full load testing ongoing. When a thermometer placed at the front of the PC read 33°C, measurements were recorded, as shown below.

Hot 33°C Ambient Testing
Activity
CPU
HDD
Fan RPM
SPL
dBA@1m
AC Power
full load
(RTHDRIBL and CPUBurn x2)
55°C
36°C
720
23
87W

Despite the >200 RPM increase in the main fan speed, the overall noise barely increased at all, neither subjectively nor by SPL measurement. Temperatures remained perfectly safe. It wasn't possible to achieve higher ambient temperature in our lab, but it's safe to say that in hotter weather, the fan would probably speed up more and the whole system would get louder. For reference sake, Q-Fan was disengaged so that the main case fan would run at full speed, and the load test was run once again.

33°C Ambient with Main Fan at Max Speed
Activity
CPU
HDD
Fan RPM
SPL
dBA@1m
AC Power
idle
23°C
36°C
930
25
40W
full load
(RTHDRIBL and CPUBurn x2)
48°C
37°C
910
25
87W

Although it's only a 2 dBA measured increase in SPL, it is subjectively significant. The reason is because it's high enough above the ambient level to become psychoacoustically more noticeable. Still it remains a smooth broadband noise, and except under extreme load during a heat wave, you're unlikely to encounter this level of noise from the SPCR Stealth 100. Cooling of all components remained excellent.

Notes:

  1. Anitec Computers also offers this system without any operating system for those who already have their own.
  2. It's very important to keep the ventilation slots at the top of the case unblocked; otherwise, the power supply could overheat.

Summary

The SPCR Stealth 100 by Anitec Computers works exactly as intended. It is highly capable and very quiet.

Anitec's page for SPCR Stealth 100



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