300 Watt ATX Replacement Computer PC Power Supply

Replace or upgrade to a 300W power supply for a standard ATX computer

Product ID: ATXPOWER300

  • Provides a maximum output power of 300 watts
  • High-Flow fan provides efficient cooling for the system and power supply
  • High quality connectors provide minimal resistance and enhanced electric conductivity
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  • Premium EMI/RFI power filtration system provides low noise/ripple for super clean and stable power to all system components
  • ATX version 2.03 and ATX12V compliant
  • 2 years warranty
  • Quad Protection Plus: Short Circuit Protection, Over Voltage Protection, Over Load Protection, Over Current Protection, and No Load Operation.
  • Long-life transformer and built-in short-circuit protection
  • The temperature controlled smart fan cools your entire system while the EMI/RFI power filter reduces noise/ripple
$72.99 CAD
2710+ In stock
In stock
CA: 30 | US: 2680
In stock
Where To Buy


A reliable upgrade or replacement power supply for desktop PCs.

This power supply offers an upgrade or replacement to a variety of Intel or AMD-based ATX desktop computer systems. Compliant with the industry standard ATX specification and using the standard ATX form-factor, this power supply (PSU) can be used as a replacement in a variety of popular OEM desktop systems.

Conforming to ATX revision 2.03, this power supply features a 20-pin ATX power connector and 6-pin AUX power connector, for support for older, legacy computer systems, as well as some newer, low powered systems with it's ATX12V connector. High quality components and a built in 80mm cooling fan lend to a durable and reliable power supply, while being backed by's 2 year warranty and free lifetime technical support.

The Advantage

  • High performance components and connectors are designed for extra long life and provide maximum system performance
  • Long-life transformer and built-in short-circuit protection
  • See Applications page for detailed list of supported
  • The temperature controlled smart fan cools your entire system while the EMI/RFI power filter reduces noise/ripple


Replacement for standard 250W & 300W ATX12V Power Supplies

Replacement Power Supply for Bestec ATX-300-12E

Compatible with following eMachines A-Series Model:

Compatible with following eMachines C-Series Models:
C1641, C1844, C1904, C2160, C2280, C2480, C2684, C2685, C2782, C2825

Compatible with following eMachines D-Series Models:
D2046, D2244, D2246, D2266, D2346, D2386, D2586, D2685

Compatible with following eMachines H-Series Models:
H2341, H2482, H2542, H2602, H2615, H2642, H2742, H2825, H2865

Compatible with following eMachines S-Series Models:
S1642, S1862, S1940, S2482, S2485

Compatible with following eMachines W-Series Models:
W1500, W1640, W1700, W1800, W2040, W2047, W2060, W2247, W2060, W2247, W2260, W2646, W2686, W2785, W2958, W4682, W4065

Compatible with following eMachines T-Series Models:
T1140, T1150, T1220, T1221, T1300, T1360, T1440, T1600, T1740, T1742, T1782, T1840, T1842, T1860, T1862, T1980, T2040, T2042, T2080, T2082, T2085

T-Series (cont'd):
T2200, T2200SE, T2240, T2245, T2260, T2341, T2385, T2460, T2482, T2484, T2542, T2596, T2605, T2615, T2625, T2642

More T-Series:
T2672, T2682, T2692, T2698, T2778, T2792, T2796, T2798, T2824, T2825, T2842, T2865, T2875, T2882, T2885, T2895, T3025, T3265, T4060, T4080, T4170, T4480, T4510, T4511, T4697, T6000

Compatible with following Gateway Models:
DX100, B330

Technical Specifications

Warranty Information
Warranty 2 Years
Fan Bearing Type Sleeve Bearing
Fans 1 - 80 mm
Air Flow Rate 32.3 CFM
Efficiency Rating >65% (Typical Load)
Fan RPM 3000 RPM +/-10%
MTBF 40,000 Hrs
Noise Level 27.4 dBa
Output Power 300W
Power Factor Correction No
Output Connectors 1 - ATX 12V P4 Power (4 pin, v 2.x) Male
1 - ATX AUX Power (6 pin, v 1.x) Female
1 - ATX Power (20 pin, v 1.x) Male
1 - SATA Power (15 pin) Receptacle
2 - SP4 (4 pin, Small Drive Power) Female
6 - LP4 (4 pin; Molex-type Large Drive Power) Female
Current +12.0V1 (A) 15A
Current +3.3V (A) 28A
Current +5.0V (A) 30A
Current +5.0Vsb (A) 2A
Current -12.0V (A) 0.8A
Current -5.0V (A) 0.3A
Input Current 8A ~ 4A
Input Voltage 115~230
Max Inrush Current 50
Operating Temperature 0 ~ 50
Storage Temperature -20 ~ 80
Physical Characteristics
Product Height 3.3 in [8.5 cm]
Product Length 5.9 in [15 cm]
Product Weight 3.2 lb [1.4 kg]
Product Width 5.9 in [14.9 cm]
Packaging Information
Shipping (Package) Weight 4 lb [1.8 kg]
What's in the Box
Included in Package 1 - 300W ATX Power Supply
1 - Power Cord (NA)
1 - Instruction Manual



300 Watt ATX Replacement Computer PC Power Supply

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