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