Introduction and Features

The EVO 1,250W PSU delivers a lot of power with good regulation, good efficiency, and plenty of cables/connectors. This monster is about as big as you will be able to operate from a standard 120 VAC, 15A residential circuit in NA.
Introduction
           
Enermax Galaxy EVO 1,250W Power Supply Review - Cases and Cooling  40
(Courtesy of Enermax)
       
The king of the hill in Enermax’s new PSU lineup is their Galaxy EVO 1,250W unit that picks up where the Revolution85+ series left off (Revolution 85+ 850W, 950W and 1050W).  That extra 200W results in an additional 17A spread out across six +12V outputs.  Otherwise the Galaxy EVO 1,250W PSU is virtually identical to the Revolution85+ 1,050W PSU and offers numerous features targeted towards high-end gaming system and workstation owners.  The Enermax Galaxy EVO 1,250W PSU comes with an excellent selection of both fixed and modular cables with a wealth of connectors to support all the latest hardware.

Enermax Galaxy EVO 1,250W Power Supply Review - Cases and Cooling  41
(Courtesy of Enermax)

Enermax Galaxy EVO 1,250W PSU Key Features:

•    1,250W DC output, 24/7 at 50°C
•    1,248W (104A) available on +12V outputs
•    High Efficiency: up to 89% between 20-100% load, 80 Plus Bronze
•    Future CPU and GPU Ready (12-pin sockets and zero load, C6 state)
•    HeatGuard: keeps the fan running for 30-60 sec. after shutdown
•    PowerGuard: LED status monitor (Off-Stby-OK-Fail)
•    SafeGuard (OCP, OVP, AC/DC UVP, OPP, OTP, SCP, SIP)
•    CrossFireX Certified (up to HD4870X2)
•    3-Year Warranty

Asymmetric Hybrid DC-to-DC Topology

Enermax Galaxy EVO 1,250W Power Supply Review - Cases and Cooling  42
(Courtesy of Enermax)


PSU Testing Methodology

Establishing an accurate load is critical to testing and evaluating a PC power supply.  PCPerspective’s power supply test bench can place a precise 2,000 watt DC load on the PSU under test.  Each power supply is tested under controlled, real-world conditions up to its maximum rated load, using both 115 VAC and 240 VAC line voltage.  Our current suite of tests includes:

•    DC Load Regulation
•    DC Line Regulation
•    DC Cross-load (unbalanced load)
•    AC Ripple and Noise
•    Power Factor
•    Efficiency
•    Differential Temperature
•    Noise

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The Enermax Galaxy EVO 1,250W power supply was evaluated on both features and performance.  A full range of equipment was used to test the power supply under controlled load conditions. 

•    (2) CSI3710A Programmable DC load (+3.3V and +5V outputs)
•    (4) CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
•    Extech MultiMaster MM570 digital multimeter (Accuracy ±0.02%)
•    Extech 380803 Power Analyzer (Accuracy ±0.5% of full scale)
•    DS1M12 “StingRay” digital oscilloscope (20M S/s with 12 Bit ADC)
•    Powerstat Variable Autotransformer, 1.4 KVA, 0-140 VAC
•    Extech Model 407738 digital sound level meter (Accuracy ±1.5 dB)
•    Custom PC60 enclosure to simulate real-world operating conditions




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