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ATX 3.0 is Intel's new specification standard for existing PSUs. In short, ATX 3.0's main purpose is to help provide more reliability, and better power efficiency and provide graphics cards up to 600 watts of power. ATX 3.0 is created in response to graphics cards' increase in performance and the ever-increasing need for power. The unit has OCP, OVP, OPP, OTP, SCP and UVP protections and MSI claim 100% Japanese 105c Capacitors throughout – which we will look at later in the review. From the chart below you can see that the MEG Ai1300P PCIE5 can safely achieve 2x total power excursion at 200% of the PSU wattage while meeting all the standards of Intel Testing Requirements at 120%, 160%, and 180% as well. The voltage of MEG Ai1300P PCIE5 can be controlled within the allowable voltage range when the current changes rapidly and violently to maintain the system stability and avoid system abnormalities. OPP and OCP Tests MSI call this ‘G.I' (Gaming Intelligence) support. I can't say I really have had great experiences with the MSI software in the past and sometimes it would crash on the test system I used, but the software for the power supply seems to show everything that MSI claim.

Real-Time Power Status Monitor: Through the MSI Center, this power supply helps monitor the real-time status of the percentage of power supplied to GPU and CPU and the total system wattage used. Load regulation holds well across the board. Within 2%. This is a very good result for MSI. MSI MEG Ai1300P MSI's real time power monitor works via the MSI Center app and is useful if you wish to monitor power supplied to the system. The electrical performance of the MSI MEG Ai1300P PCIE5 1300W PSU is very good overall. Our instruments recorded a maximum ripple of 32 mV on the 12V line with a recommended design limit of 120 mV, an excellent figure for a PSU with that kind of power output. The filtering of the minor voltage lines is even better, with a maximum of 12 mV and 14 mV on the 3.3V and 5V lines respectively. Voltage regulation on the minor lines is very tight, with both lines staying within 0.8% across the load range. Strangely, especially for the CWT platform, the voltage regulation of the 12V line is much looser, at nearly 2%. This still is a very good figure but uncharacteristic of the particular OEM or class of this PSU.

Cold Test Results (~22°C Ambient)

Nevertheless, we took a shot at testing the power excursion capabilities of the MSI MEG Ai1300P PCIE and of thefew ATX 3.0 compliant units that we currently have available. We took two approaches:one by assuming that our electronic loads are “ideal” and programmed the exact duty cycle figures that Intel dictates in their guide, and one by trying to take into account the real slew rate times of our loads and calculate the RMS equivalent duty cycle. ATX 3.0 puts heavy emphasis on power excursions to make sure high-performance graphics cards can be sustained and your system can remain stable. Thanks to ATX 3.0 there is now an increase in efficiency while idling and a new power connector is added to help achieve all the above.

MSI are trying to attract the user base who love to tinker with their hardware via dedicated software. I appreciate the concept of being able to control a power supply via a program however MSI Center is a clunky, unpleasant tool to use at the best of times. While using MSI Center my only thoughts were to get it deinstalled as soon as possible. I would personally just run the power supply in a default single rail mode mode all the time and let the fans operate automatically without the need for a software install. The other capabilities of MSI Center such as real time monitoring will be interesting to a very niche audience, but perhaps for only a short while. The resistance of the MSI MEG Ai1300P PCIE5 unit to adverse ambient conditions is astonishing, with the unit hardly affected at all while operating inside our hotbox. There is a practically negligible efficiency degradation of 0.2-0.3% depending on the load, a figure four to six times lower than other similar designs. There is very little additional degradation under heavy loads, suggesting that the components of the MSI MEG Ai1300P PCIE5 are not thermally stressed at all.Aiming for unwavering product quality and performance stability, the power supply comes with 100% Japanese 105° C capacitors and solid capacitors. We managed to get the PSU to achieve 1428W before it would shut down, delivering 128W more than the rated specifications. We take the issue of noise very seriously at KitGuru and this is why we have built a special home brew system as a reference point when we test noise levels of various components. Why do this? Well this means we can eliminate secondary noise pollution in the test room and concentrate on components we are testing. It also brings us slightly closer to industry standards, such as DIN 45635. In terms of electrical performance, the MSI MEG Ai1300P PCIE5 does deliver. Keeping its massive power output in mind, the MEG Ai1300P manages outstanding power quality, with excellent voltage regulation and remarkable filtering. MSI’s engineers did not neglect the minor voltage lines either, which often are not as well filtered as the main 12V line. The efficiency of the MEG Ai1300P barely meets the 80Plus Platinum certification standards but it is extremely stable and practically unaffected by high ambient temperatures. It also is very efficient at very low loads, which is important for a unit with a very high-power output.

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