In recent years, the development of SFX power supply is very rapid, in terms of rated power alone, 750W rated power is already the "starting price" of many **SFX power supplies, which makes today's mini platform no longer limited to the category of low power and low performance, but in the face of high-power and high-performance hardware, it can also be at ease, further expanding the playability of the mini platform. Of course, in terms of the number of products, the number of SFX power supplies with a power rating of 750W or higher on the market is still small, at least compared to the dazzling ATX power supplies, which cannot be regarded as the same order of magnitude. However, as more power supply manufacturers, especially established power supply manufacturers, join the battle, there are more and more optional products for medium and high wattage SFX power supplies.
Huntkey's newly launched MX750P power supply is an SFX power supply for medium and high wattage fields, which not only has a 750W rated power, but also has passed the 80PLUS platinum certification, and is also based on ATX 3 specifications, equipped with a 600W 12VHPWR interface, which is obviously a product aimed at a high-end mini platform.
Basic specifications of Huntkey MX750P power supply:
The size of Huntkey MX750P power supply is 100*125*635mm, which belongs to the standard SFX specification, and the 9215 specification, that is, the 92mm diameter and 15mm thickness fan, is also considered a standard configuration in the SFX power supply, and the fan grille integrated with the shell gives the power supply a certain sense of integrity.
At present, Huntkey MX750P power supply has two colors: black and white, of which the white version has been completely whitened except for the fan in appearance, including the standard module cable and AC cable are white, and the overall appearance is quite fresh.
Huntkey MX750P power supply adopts a fully modular cable design, and the interfaces are all located in the shell, so there is no problem in terms of installation compatibility. It is worth noting that the CPU and PCI-E module interfaces of the power supply are not general-purpose interfaces, and the shapes are differentiated.
The power module interface is divided into four groups, 24PIN corresponds to the 24PIN main power supply interface, 2 8PIN ports with different shapes are used to expand the CPU and PCI-E power supply interfaces, 3 5PIN ports with foolproof design are used to expand SATA power supply and D-type 4PIN interfaces, and the rest is a native 12VHPWR module interface. All module cables are embossed with 1 x 24pin main power supply, 1 x 4+4PIN CPU power supply, 2 x 6+2PIN PCI-E power supply, 4 SATA power supply, 3 D-type 4pin power supply interfaces, and 1 12+4pin 12VHPWR power supply interface.
Huntkey MX750P power supply has passed the 80PLUS platinum certification, supports 100V to 240V AC input, the total output power is rated 750W, adopts a single +12V output design, and the +12V output current is rated 625A, equivalent to 750W rated power; +5v vs. +33V is transferred from +12V through the DC-DC circuit, the output is rated at 20A, and the combined output power is rated at 140W; +5V standby is rated at 2A, which is equivalent to 10W of output power.
The power supply uses a 9215 specification, which is a fan with a diameter of 92mm and a thickness of 15mm.
The AC input port of the power supply is equipped with a separate switch.
The power supply is equipped with Yuelun's D92PH-12B fan, 92mm diameter, 15mm thickness, using FDB liquid dynamic bearings, and the motor is DC12V 06A specification, 7-blade design, measured speed up to 3700rpm.
Huntkey MX750P power supply adopts active PFC + half-bridge LLC resonant + synchronous rectification + DC-DC structure, and the module interface PCB is an in-line design, +5V and +3The 3V DC-DC module also has a stand-alone PCB design, which makes full use of the internal space and closely arranges the components.
The power supply has a complete EMI circuit, and the NTC has an independent relay; The main capacitor is Sanshin Samxon 420V 390F 105; The PFC switch and the PFC diode share a heat sink, and the two main switch tubes share another heat sink. The main transformer of the power supply is directly connected to the +12V synchronous rectifier circuit, and the heat is conducted to the shell for heat dissipation through the thermal conductive paste; +5v vs. +3The 3V adopts a DC-DC design with a separate PCB and uses a closed inductor and solid-state capacitor. The filter capacitors are all solid-state capacitors, which are mainly arranged on the module interface PCB.
The specifications of Huntkey MX750P power supply are as follows:
We conduct a 230V input balancing load test and ripple test at 120% rated power of the participating power supply, and the results of this test are not included in the calculation of the super energy index, but are simply used to observe the power margin of the power supply.
Judging from our test results, after the Huntkey MX750P power supply is overloaded to 120% power, that is, the output voltage of each channel is still maintained at a normal level, and the change in conversion efficiency is also within the normal range, which is commendable. The OPP over-power protection point of the power supply is measured to be 1290W, which is equivalent to 172% of the rated power, and the protection point is set relatively high to meet the needs of high-power hardware.
In terms of ATX 3 specification verification, the most important parameters in the industry are the conversion efficiency of 2% light-load output and the dynamic peak power performance under % instantaneous dynamic output. It has been determined that when the Huntkey MX750P power supply is at 2% light load, that is, 15W output, its conversion efficiency is more than 65% under 230V input and more than 67% under 115V input, and the dynamic peak power test is all passed, which can be judged to meet the requirements of ATX 3 related specifications.
PS: Overload to 120% power is required for evaluation, we do not recommend gamers to overload the power supply, if you do need higher output power, please use a product with a higher power rating.
In terms of voltage performance, Huntkey MX750P power supply is +12V +5V +3The 3V voltage deviation and voltage regulation can be controlled within 3%, which may be inferior to ATX power supplies at the same price and power, but it is a good performance in the SFX power supply category, and it is also easy to deal with mainstream or mid-to-high-end platforms.
Huntkey MX750P is an 80PLUS platinum certified power supply with a conversion efficiency of 67 at 2% output at 115V input3%, the conversion efficiency is close to 83% when the output is 50W power, the conversion efficiency is close to 89% when the output is 100W, the half-load output efficiency is more than 92%, the full-load output efficiency is close to 90%, and the maximum conversion efficiency is more than 92%; In the 230V input environment, its conversion efficiency exceeds 65% at 2% output, 84% at 50W output, and can maintain more than 90% from 100W output, with a maximum of more than 93%, and a full load conversion efficiency of nearly 92%.
Ripple and noise are AC components that are mixed in the DC output of the power supply, and if you observe it with an oscilloscope, you will see a slight fluctuation of the voltage up and down, like water ripples, so it is called ripple. Follow Intel ATX12V 30 provisions, +12v, +5v, +3The output ripple of 3V and the VP-P (peak-to-peak) of noise must not exceed 120mV, 50mV, and 50mV, respectively. We use a digital oscilloscope at 20MHz analog bandwidth to connect the decoupling capacitor at the measurement point of the fixture board according to Intel specifications, and measure the output ripple at full load and overload to 120% power, and use the ripple peak at low frequency as the scoring benchmark.
Huntkey MX750P power supply at 100% full load +12V, +5V, +3The 3V low-frequency ripple is 39MV, 14MV and 17MV, and after the overload to 120%, that is, 900W, the power output ripple is increased to 52MV, 22MV and 24MV, although the change range is not small, but it is basically within a reasonable range, and the ripple suppression is still remarkable.
Cross load test projects we follow Intel ATX 3 and SSI EPS12V 292 requirements of the power supply design guidelines, and develop a 750W power supply cross-load chart.
It is worth noting that we did not copy the design specifications as they were, but only selected the four test points that are more meaningful, namely the lower left, top left, upper right and lower right corners of the cross load box.
The meanings of these four points are as follows:
Lower left corner (point A): the minimum load of the whole machine;
Upper left corner (point B): maximum load of auxiliary circuit, minimum load of 12V, such as when multiple HDDs are started at the same time;
Upper right corner (point C): maximum load of auxiliary circuit, full load of the whole machine;
Lower right corner (point D): 12V maximum load, auxiliary minimum load, such as running 3D games with a single SSD;
The x-coordinate of the test point represents the total output power of +12V, and the Y-coordinate represents +5V and +3The sum of the output power of 3V.
The cross-load test is consistent with the previous uniform load test, with as little voltage deviation as possible from the rating, with a permissible 5% deviation rate for each channel.
Huntkey MX750P power supply at +5V and +3The DC to DC design is used on the 3V output, which is more advantageous in the cross-load (pull deviation test), and although the voltage changes of the three outputs are different in different load environments, they are relatively small in terms of amplitude and will not affect the user experience.
Hold-up time refers to the time when the voltage output value falls out of the range of 5% after the power supply is good, and we measure the hold time of +12V, +5V and Power-OK (power-good) signals.
ssi eps12v 2.92 The requirements for the output voltage hold time in the server power supply design guide are that the hold time of the power supply should be greater than 18ms at 75% load, and the hold time of the Power-OK signal should be greater than 17ms. intel atx 3.The requirement for the output voltage hold time in 1 is that the hold time of the power supply should be greater than 12 ms at 100% load, and the hold time of the Power-OK signal should be greater than 11 ms.
Power-OK keeps 17ms means that the computer can continue to run without shutdown or restart in the face of a power-down situation within 17ms, and the voltage of each channel is maintained for 18ms or longer, in order to make emergency treatment for each hardware when a power failure occurs, such as the head homing of the mechanical hard disk and the power-down protection of the SSD.
The hold-up time of the Huntkey MX750P power supply is at 75% load (DC output 5625W) and 100% load (DC output 750W).
At 75% output load, the +12V hold time of the Huntkey MX750P power supply is 206ms, +5V is 216ms, both sets of performance meet the requirements, and the Power-OK retention time is considered to be on the passing line. At 100% output load, ATX 3 can be satisfied1. Although it is true that there is not a lot of room for the relevant requirements from the margin. This situation is actually normal for SFX power supplies, after all, the maintenance time parameters are more important to the scale of materials, and the internal space of SFX power supplies is limited, so it is reasonable to make a compromise on parameters.
Huntkey MX750P power supply supports the intelligent fan temperature control function, with the ability to automatically stop, before the output reaches 250W, the fan is in a standstill state, and the fan with an output of more than 250W will run in the range of 1450rpm to 1500rpm until the power output reaches 400W. Then the fan speed will increase with the increase of the power output of the power supply, when the output of 500W power reaches 2000rpm, when the full load of 750W fan speed reaches the level of 3200rpm, with 9215 specifications of the fan will have a slight noise, but it basically does not affect the user's experience.
According to our current scoring criteria, the Huntkey MX750P power supply has an ultra-energy index of 8506 points, which belongs to the level of excellent power supply, is commendable in SFX power supply, and is suitable for use with small steel cannon type mini platform.
At present, the official price of Huntkey MX750P power supply is 799 yuan, and you can enjoy a 5-year warranty including 1 year replacement. From the point of view of ** and its performance, it is quite cost-effective in SFX power supply, in line with ATX 3 specifications at the same time, the comprehensive performance is also remarkable, 750W rated power is also enough to meet the needs of high-end platforms, although it is not a perfect product, but its own performance and positioning are consistent, it will be a choice that players will not regret.
Power Mini Ladder (Full Power Ladder).
For power supplies with rated power greater than or equal to 1000W, the ladder score will be added by 1 point on the basis of the Super Energy Index).
Of course, in our opinion, the Huntkey MX750P power supply does have some areas for improvement, for example, it still makes some compromises in tuning in terms of holding time, +5V and +3The voltage performance of 3V is only average, and there are products on the market that do better than them. However, these aspects are not "fatal injuries" for Huntkey MX750P, at most they can only be regarded as "insufficient", and do not affect our evaluation of its overall comprehensive quality.
s Pros:
80plus Platinum Certified.
Meets ATX 3 specifications.
Excellent 12V output.
It has a 5-year warranty including a 1-year replacement.
x Cons:
Keep the time margin low.