Articles: Cases/PSU

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We are publishing test results of 14 power supplies from 12 brands ranging in wattage from 1000 to 1500 watts. We guess the scale of the test session is up to the tested products’ class.

Testing Methodology

Click the following link for a description of our testing methodology and equipment and a brief explanation of what the specified and tested parameters of power supplies mean: X-bit Labs Presents: Power Supply Units Testing Methodology In-Depth. If you feel overwhelmed with the numbers and terms this review abounds in, refer to an appropriate section of the mentioned article for explanation.

You can also go to our Cooling/PSU section to check out reviews of other PSU models we have tested in our labs.

We will mark the actual power consumption of three system configurations (discussed in our article PC Power Consumption: How Many Watts Do We Need?) in the cross-load diagrams. This will help you see if the PSU can meet the requirements of a real-life PC. We will also add overclocked configuration to this list in near future.

overclocked configuration to this list in near future.

Testing Participants

Akasa PowerMax AK-P100FG (1000W)

Akasa is a new name in our PSU reviews. Running a little ahead, I must confess it does not make PSUs itself. The actual manufacturer is Enhance Electronics.

The PSU comes in a large box with a carry handle. The accessories include a user manual, screws, and a power cord.

Exterior Design

The PSU has rather modest dimensions. It is a little larger than the ATX form-factor’s standard 145 millimeters, but will easily fit into any system case that you might want to install such a high-wattage PSU in. The PSU housing is painted matte black and lacks any decorative elements except for the LED near the power socket that shines green when the PSU is on and red when the PSU is off.

The Akasa PowerMax is equipped with fixed cables including:

  • Mainboard cable with a 20+4-pin connector (76cm long)
  • CPU cable with a 4+4-pin connector (76cm)
  • Two graphics card cables with one 6+2-pin and one 6-pin connector on each (57+15cm)
  • Two cables with three SATA power connectors on each (56+25+25cm)
  • Two cables with three Molex connectors and one floppy-drive plug on each (56+25+25+14cm)

This model is going to suit system cases with a bottom position of the PSU which have become popular due to good temperature conditions. You have to extend the CPU power cable to use regular PSUs in such system cases, but the AK-P100FG’s CPU cable is a generous 76 centimeters long.

This model has only two cables with SATA power connectors (this may be not enough to power up a RAID array built out of 4 or 5 disks because one cable goes to optical drives usually located high above) but the cables are 10 centimeters longer than standard (25 centimeters between the connectors). Still, I guess that three cables, even shorter, would be handier for users of RAIDs.

You might also cavil at being offered only two graphics card cables with four connectors. It means you can connect two top-end graphics cards without adapters. On one hand, our tests suggest that today’s games do not scale up well on more than two GPUs (and you can build even a quad-GPU subsystem out of two graphics cards by using Radeon 4870 X2 or GeForce GTX 295), but on the other hand, there are some users who pack three graphics cards into their computers.

Well, I’m just fault-finding. The selection of cables and connectors is good enough to assemble a top-end gaming station.

Interior Design

Notwithstanding the compact size, the PSU is not cramped inside. After huge-size 1000W models I have got used to, I would visually estimate the wattage rating of the AK-P100FG at 600-700 watts (running ahead, I must admit that this PSU copes with 1000W load without problems).

This must be due to a steady improvement in components. A higher efficiency means lower heat dissipation and the opportunity to install smaller heatsinks. Higher operating frequencies mean a smaller power transformer, so one 1000W transformer can be fitted within the PSU housing without being split into two 500W transformers.

The AK-P100FG does not have any of the newfangled technologies such as dedicated switching regulators at the output to produce +5V and +3.3V out of +12V. This is a rather ordinary product with dedicated voltage regulation based on magnetic amplifiers. It also has an active PFC device (such high-wattage PSUs do not come without one anyway).

The native Enhance marking can be seen in the corner of the PCB. This is an ENP-6600 series product that must be identical to the 1000W Enhance ENP-6610GA (I will discuss it along with other Enhance products in an upcoming review).

Teapo capacitors are installed on the PSU’s output. They have given no reason to worry about their quality.


Having a total wattage of 1000W, the PSU can yield up to 840W via the +12V rail split into two “virtual” output lines. Thus, its effective output power (considering that modern computers mostly load the +12V rail) is about 900 watts.

UPS Compatibility

Together with an APC SmartUPS SC 620 this power supply worked at loads up to 370W and 340W when powered by the mains and the batteries, respectively. The pair switched to the batteries without problems. The UPS was perfectly stable.

Output Voltage Stability

The PSU easily keeps all of its output voltages within the required limits under any permissible load. Each of the three reference configurations is in the green zone meaning that the voltages do not deflect more than 2%.

Output Voltage Ripple

The output voltage ripple is within the permissible limits except for occasional spikes on the +5V rail. The oscillogram shows that the power supply’s PWM regulator works at a very high frequency of over 150 kHz.


The PSU is equipped with an 11-blade 135x135x25mm fan from Young Lin Tech.

The fan’s speed does not change much through most of the load range, varying from 1050 to 1100rpm and reaching a modest maximum of 1280rpm. However, the PSU is not exactly silent. You can hear it even under zero load. On the other hand, most users are going to find it very quiet.

Efficiency and Power Factor

The PSU owes its compact size and quietness to high efficiency: up to 88% at the maximum and over 80% at loads from 100 to 1000W. The power factor is excellent, too. It is never lower than 98% at loads from 300W to maximum.

Standby Source

The output voltage of the standby source boasts excellent stability, not even getting close to the limits. On the other hand, its load capacity is rather low at 3A. This is enough for modern computers but many PSUs of similar wattage allow loading the standby source by 5 or 6A.


The only fault I can find with the Akasa PowerMax AK-P100FG is that it offers rather few (for such a high-wattage PSU) cables, but this may even be a good thing for users who don’t need a lot of power connectors. Otherwise, the PSU fully complies with its specs and will not disappoint its owner. With excellent electric parameters, problem-free operation with UPSes and low noise, this power supply will be a good choice for a top-performance home machine.

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