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Inadequate Documentation

Inadequate and Deceptive Product Labeling: Comparison of 21 Power Supplies
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Many of the power supplies came with very sketchy documentation, but Antec and Enermax were ahead of the curve with their more complete documentation. Most of the manuals were strangely reticent on the subject of the combined output load, and many manufacturers apparently think that providing brief technical details on the model identification sticker is adequate information. If you want to avoid overloading your power supply, you must have accurate information on the output available at each voltage. Manufacturers really need to improve their act with the documentation (or lack thereof) that they currently provide.

Short Glossary

Active Fan Speed Adjustment

With the help of a thermistor, the fan speed is automatically altered to suit the ambient air temperature. This provides the lowest possible noise levels while maintaining efficient cooling.

ATX/12V - Important For P4 Systems

Pentium 4 systems need an ATX/12 V connector to power the CPU. Minimum requirement here is compliance at least with the ATX 2.03 standard. You will find more details on this under Form factors.

PFC = Power Factor Correction

Since the beginning of 2001, the 61000-3-2 Standard has specified maximum limits for the harmonic current emissions of power supplies. This is achieved in practice by smoothing out the power supply’s short, high-magnitude pulses using active or passive PFC.

Technical Specs & Results

Manufacturer Channel Well Engelking Elektronik Herolchi SCS Task Topower
Product CWT-300ATX-12D AP2-6300SFC-A HEC-300LR-PT SCS-300 TK-930TX Top-320P4
Overall
Rating
adequate satisfactory satisfactory satisfactory adequate satisfactory
Technical Specs/Measurements
Product Image
max. performance
(Manufacturer-
claimed/
Measurement )
300/307 W 300/339 W 300/351 W 300/302W 300/204 W 320/353 W
-5 V/

- 12 V
(Manufacturer-
claimed)
0.5/0.5 A 0.3/0.8 A 0.5/0.8 A 0.6/0.6 A 0.6/0.6 A 0.5/0.8 A
+3.3 V/
+5 V/+12 V
(Manufacturer-
claimed)
30/20/15 A 30/28/11 A 30/28/15 A 23/15/10 A 25/15/12 A 32/26/15 A
+5 VSB (A)
(Manufacturer-
claimed)
2.0 A 2.0 A 2.0 A 1.5 A 1.5 A 2.0 A
PFC active active passive passive passive active
Fan/
Fan
regulator
2/active 1/active 1/active 1/active 1/active 2/active
Mains
supply 230 V
yes yes no yes yes yes, international
Input
Voltage/
Voltage
Settings
230 V/i 100 to 240 V/automatic 230 V/i 115 and 230 V/Switch 115 and 230 V/Switch 195 to 250 V/automatic
Wire/
HDD connectors/
FDD connectors
3/7/2 3/5/1 3/6/2 2/4/2 2/4/2 3/8/2
Cable Length
HDD &
FDD connections
65 cm 60 cm 67 to 94 cm 60 cm 60 cm 65 to 90 cm
Cable length
ATX/ATX
12V/AUX
38/39/39 cm 51/52/53 cm 51/46/53 cm 32/32/32 cm 32/32/32 cm 48/50/48 cm
Connection
for fan
monitor/
regulator
no/no yes/no no/no no/no no/no no/no
Power cable/
Screws/
User manual
yes/no/no yes/no/yes yes/yes/yes no/no/no no/no/no yes/yes/no
Other
details
none passive external cooler none none none mains power international
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