Page 4 - Minor Tests and Conclusion
Power supplies are interesting products, because often, reviews of products in this category are conducted and tested in methods that make it difficult to distinguish one power supply from another. Many aspects must be taken into consideration. Certain criteria consist of efficiency, noise, power ripples, and of course the ability to pull out the rated specifications. Because many cannot afford such equipment to obtain results regarding those aspects, articles covering power supplies often come out with less than adequate and acceptable information. As this is a product report -- not a review -- what we are doing is a close examination of the power supply and the internal hardware and build. But what we can do for you is do some minor testing with the results we can present to you with and let other review sites with professional equipment show you the actual test results. We are not going to try to create useless test results by installing the power supply into the latest gaming rig and try to take readings from that, as this is not even remotely the correct way to test power supply units. We understand that many websites do that as a means of load testing, but the results, even if you use an oscilloscope and multimeter at each output location, it is not sufficient, nor does it accurately reflect the performance of the power supply.
Using our power supply tester which exerts minimal load on the power supply, the initial consumption was 5W as measured by our wall meter unit, indicating that the basic load-free power consumption of the power supply is excellent. Independent sources with professional load testing equipment showed the 1000W version of this, based off an identical design with minor component differences, delivered very good efficiency for its class and excellent voltage regulation and ripple across all rails. This power supply unit has 80 Plus Gold and Cybenetics ETA Gold ratings.
Voltages with minimal load are accurate, which is a basic requirement of power supplies out of the box. This power supply is ATX 3.0 compliant and officially supports Alternative Sleep Mode with 100 to 150ms PG specifications, so it looks like the PSU tester I used was not fast enough to pick up the true PG signal. The ATX design specifications state a PSU's PG is required to be between 100ms and 500ms, with 250ms maximum for Non-Alternative Sleep Mode and 150ms for Alternative Sleep Mode.
Active power correction is important to correct AC load line loss. In AC power, there are three components to it, as there is a phase difference between current and voltage. This makes up the power triangle, which consists of the following: Average usable power (P, measured in watts), reactive power (Q, denoted as VA-R), and total power (S, written as VA). While they all have the same physical units, it is not the same thing as aforementioned. What we want is the average usable power with as little wasted reactive power as possible. The total power provided over the AC line is the magnitude of the two combined (sqrt(P^2+Q^2)). Power factor can then be easily calculated by P divided by S. The ideal value is 1.00, and this is where active PFC comes in. The XPG Core Reactor II 1200W has active PFC, and the power factor will approach 0.99 with a nominal load.
The XPG Core Reactor II 1200W is a silent to very quiet power supply, depending on the amount of power being drawn. Under idle level loads, or less than approximately 40%, the XPG Core Reactor II 1200W is inaudible because the fan is shut off completely. Under moderate loads above 40%, the Core Reactor II 1200W is reasonably low noise until about 70%, which then becomes quite audible. Personally, I found the Hong Hua HA13525H12SF-Z to be good at low speed, but gets noisy at high speed. While this is very subjective, I am quite a picky person on noise. On a scale from 0 to 10 where 0 is silent and 10 is the loudest, I would rate the XPG Core Reactor II 1200W to be at 0.0/10 when the fan is off, because, well, the fan is off. Above that, I would peg it at 2.0/10 acoustically under moderate loads. This PSU is rated at Cybenetics LAMBDA A- for noise. If you are a silent PC enthusiast, the XPG Core Reactor II 1200W is a respectable choice under most usage scenarios.
XPG provided this product to APH Networks for the purpose of evaluation.
The XPG Core Reactor II 1200W is a solid fully modular PSU based off a familiar CWT platform that delivers a whopping amount of power in a relatively compact package with a depth of only 16cm. The Core Reactor II series adds to the Core Reactor series with ATX 3.0 specifications and PCIe 5.0 graphics card support, including the 600W PCIe 12VHPWR 12+4 pin cable. It runs quietly thanks to the low speed fan profile and zero RPM operation up to 40%. Underneath the hood, we find a cleanly laid out interior and a quality selection of components. Third-party certifications show the overall performance was very good. At a retail price of $185 at press time, the Core Reactor II 1200W is a reasonably priced 80 Plus Gold and Cybenetics ETA Gold certified power supply with a 10-year warranty to ensure you will be covered if anything goes wrong, however unlikely.
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion