Since the launch of the Black Diamond series of power supplies, their "only cost-effective" image in the minds of players has finally changed a lot, because its black diamond series power supplies really have the ability to compete in the high-end market. After the high-end market has competitive capital, Xianma decided to hit the iron while it was hot to further improve its own power supply product line, if the black diamond series solves the performance problem, then the XF series launched by Xianma this time is on this basis to further solve the problem of appearance of the product.
Strictly speaking, the Xianma XF series power supply is actually the white version of the black diamond series, but the white of the XF series is very thorough, it is not only the shell white, fans, module cables, interfaces and even the standard AC power cord are all whitened, is a "true white" posture to meet with everyone, which is also the first product on the standard ATX power supply market to be so white.
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Xianma XF 850W power supply appreciation
In the eyes of Xianma, it is now the era of "appearance is combat effectiveness", and the black diamond series is actually only a performance problem, the appearance design is still a little too traditional, and the player who encounters the "face value control" may be directly ignored. To this end, Xianma launched the XF series of power supplies, which is intended to make its own power products fully bloom in terms of appearance and performance.
From the design point of view, the Xianma XF 850W power supply is actually the black diamond 850W white version, but it is not only the shell painted white, but very carefully the fan, output interface, switch, module interface and even the standard AC power cord are changed to white, the screws used are also used uniformly plated silver screws, it can be said that the white is quite thorough.
In fact, the white version of the power supply in today's also has a lot of products, but many white version of the power supply in the strict sense should be regarded as panda color matching, the common are just the shell white, but the interface, switch and even screws, fans are still using the black version, compared to the Xianma XF series power supply is called "true white" design. Among the standard ATX specification PC power supplies, this is also the first product to be designed in this way.
The 80Plus Gold certification label on the XF series is actually closer to the 80Plus Platinum certification in terms of style, and Xianma said that this is to achieve unity in the overall color matching, and some modifications have been made on the basis of the official logo. But in our opinion, this may also be some careful thinking of the first horse, there is a "surface is gold, but actually platinum" meaning, because the XF 850W power supply is marked as 80Plus gold certification, but it is actually through the 80Plus platinum certification.
In terms of basic specifications, the Xianma XF 850W adopts a single +12V output design, the rated current of +12V output is 70A, equivalent to 840W power, +5V and +3.3V are rotated out of +12V through DC-DC, the output rated current is 20A, the combined output power is 100W, and +5V standby supports 3A current output.
The power supply adopts the 12025 specification FDB dynamic pressure bearing fan for heat dissipation, the fan supports intelligent shutdown technology, in the case of low internal temperature of the power supply, the fan will automatically stop to achieve the effect of zero noise operation. The player can also switch back to the regular temperature control mode through a separate switch, at which time the power supply fan will not stop, but the speed will be adjusted according to the temperature inside the power supply to achieve a balance between the heat dissipation effect and the silence effect.
The AC input has a separate switch, and the toggle switch for the intelligent shutdown of the fan is placed next to it
The power supply adopts the full module interface design
The module interface of the power supply is roughly divided into three groups, the combination of 10 + 18pin is used to expand the main power supply of 24pin, the 5 8pin interfaces are used to expand the CPU power supply interface and the PCI-E power supply interface, and the 4 6pin interfaces are used to expand the D-type 4pin and SATA power supply interfaces. In terms of interfaces, a total of 1 24-pin main power supply, 2 4+4pin CPU power supply, 6 PCI-E 6+2pin power supply, 8 SATA power supply and 6 D-type 4pin power supply interfaces are provided. The module cable is divided into two types, 24pin main power supply, CPU power supply and PCI-E power supply cable is braided wire, SATA and D type 4pin interface cable is flat wire, all wires including its terminal shell are white, there is a very unified visual effect.
Xianma XF 850W power supply package
Xianma XF 850W power supply disassembly appreciation
The cooling fan used in the XF 850W power supply is from POWERYEAR, the model is PY-1225L12S, the specification is DC12V/0.2A, the FDB dynamic hydraulic bearing is adopted, the nominal maximum speed is 2000RPM±10%, and the 2pin power supply interface can be changed to regulate the speed by changing the input voltage.
The internal layout of the XF 850W power supply is the same as that of the Black Diamond series, using the self-created active PFC + LLC full-bridge resonance + synchronous rectification + DC-DC architecture, because the power supply length is 14cm, so the components are arranged more tightly and the space utilization rate is relatively high.
The EMI of the power supply is divided into two parts, the first level EMI uses a separate PCB, arranged on the AC input socket, with 1 X capacitor, 1 group of Y capacitors and 1 common mode coil; the second level EMI is on the main PCB, with 2 X capacitors, 2 pairs of Y capacitors and 1 common mode coil, NTC and MOV are complete, of which NTC is located next to the main capacitor, equipped with independent relays.
The main capacitor is from Nikikon and is available in 450V/560μF/105°C
The power supply is equipped with a fully enclosed PFC inductor, the two rectifier bridges share a heat sink, but the specific model can not be observed; the PFC switch and the PFC diode share another heat sink, of which the PFC switch is two OSG60R180FF (600V/12.5A@100°C/150mΩ), and the PFC diode is G4S06506AT (650V/6A@127°C). The PFC master is CM6500UNX, which is configured on a separate PCB next to the primary side.
The four main switch tubes are arranged on a single in-line PCB, and the MosFETs are OSG65R380KF (650V/7A@100°C/350mΩ). The upper part of the PCB has been opened and extended, which can play an auxiliary role in heat dissipation.
+12V synchronous rectification of The MosFET is arranged on the front of the main PCB, using a solid capacitor for filtering, MosFET has a total of 4, fairing tube and freelance tube 2 each, the surface labeled model is 014N04A, there is no detailed public information, it is speculated that the basic specifications and BSC014N04LS (40V/100A@100°C/1.4mΩ) are similar, heat dissipation is carried out by the metal sheet next to it, and the corresponding position on the back of the main PCB is pasted with thermal paste, Heat can be directed to the power supply housing for heat dissipation.
The +5V and +3.3V power supply adopts DC-DC design, the main controller is APW7159C, MosFET has 4, each is configured with 2, the model is FTG018N03S, but there is no specific specification disclosed, the metal sheet behind it can play an auxiliary heat dissipation role, located in front of the DC-DC module is llLC resonant master CM6901T6X.
First horse XF 850W power supply test
Load balancing
We will evaluate the 230V input load balancing test and ripple test at 120% of the rated power of the power supply of 1000W (including 1000W), 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. In addition, all the participating power supplies will be tested for OPP over-power protection, and the corresponding OPP over-power protection points are given in the following table.
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The OPP over-power protection point of the Xianma XF 850W power supply was determined to be 1191W, which is equivalent to 140% of the rated power; and in the case of overload not exceeding 120%, the power supply can maintain a stable output, and the overall electrical performance has not changed significantly.
PS: Overload test is a review need, we do not recommend players overload power, if you do need higher output power, please use a higher power rating product.
Conversion efficiency
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The Xianma XF 850W power supply is ostensibly a power supply that has passed the 80Plus Gold certification, but it is actually certified by 80Plus Platinum, so the Xianma XF 850W is a "decentralized" product. In the 230V input environment, the output of 50W conversion efficiency in about 80%, output 100W conversion efficiency is close to 89%, from the output of 150W can always maintain more than 91% of the conversion efficiency, up to more than 94%, even in the case of overload to 1020W can maintain close to 93% conversion efficiency, the overall average conversion efficiency of the output is more than 92%; the maximum conversion efficiency at 115V input is 93%, the full load efficiency is at the level of 91%. There is indeed the ability to reach the 80Plus Platinum certification level.
Standby efficiency
According to the relevant specifications, the conversion efficiency of the +5V standby of the power supply at 0.1A/0.25A/1A should be higher than 50%, 60%, 70%, and the no-load power should be less than 1W. The no-load standby input of the Xianma XF 850W power supply is 0.15W, and the +5V standby output voltage is sufficient, and the conversion efficiency is excellent.
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Cooling fan speed
The cooling fan used in the XF 850W power supply is POWERYEAR's PY-1225L12S, which has a maximum air volume of 68.1CFM and a maximum wind pressure of 2.7mmH2O, and in the case of maximum air volume, the measured maximum speed can reach the level of 1955RPM.
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Xianma XF 850W power supply supports fan intelligent start and stop function, the fan will automatically stop in the case of low temperature and low load, and can also be switched to the conventional temperature control mode through independent switch. After our test, in the fan intelligent start-stop mode, the power supply can maintain the state of fan shutdown in most working hours, until the output power reaches 650W after the fan really starts to run, the starting speed is about 850RPM, when fully loaded to reach the level of 1400RPM, the noise is relatively slight, and there is basically no impact on the actual use experience.
It is worth noting that in fact, starting from the output of 500W, the fan of the XF 850W power supply has already shown signs of rotation, but at this time the temperature inside the power supply should be exactly at the critical point of starting the fan, so the fan begins to rotate for less than 10 seconds, the internal temperature of the power supply will drop below the critical point, the fan will enter the stopping state, 10 seconds to 20 seconds and then it will start to rotate, so the repeated state is to continue until the power output reaches 650W, and the fan really enters the state of continuous operation. During this time, we cannot determine the specific speed of the fan.
In the conventional temperature control mode, the power supply fan will maintain rotation, and the speed will gradually increase with the increase of output power, but it needs to be more obvious after the output power exceeds 300W, and the full load is also at the level of 1400RPM, and the entire operation process is quite quiet. Therefore, if the player cares more about the cooling efficiency of the power supply, using the conventional temperature control mode is also a good choice.
Voltage stability
The output voltage of the Xianma XF 850W power supply is very stable, of which the voltage deviation of +12V and +5V does not exceed 1%, and the voltage deviation of +3.3V output is not more than 2%; the performance of the adjustment rate is more prominent, and the three outputs can be maintained within 1%, which is indeed very good.
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Output ripple
Ripple and noise is the AC component of the DC output of the power supply, if observed with the oscilloscope, you will see the voltage up and down slight fluctuations, like water ripples, so it is called ripple. According to Intel ATX12V 2.52 regulations, the output ripple of +12V, +5V, and +3.3V and Vp-p (peak-to-peak) of noise shall not exceed 120mV, 50mV, and 50mV, respectively. We use a digital oscilloscope to measure the output ripple at full power supply load and overload to 120% power at the measurement point of the fixture board at the measurement point of the fixture board at 20MHz analog bandwidth according to Intel specifications, using the ripple peak-to-peak at low frequencies as the scoring reference.
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XF 850W power supply at 100% full load of +12V, +5V, +3.3V low frequency ripple is 38mV, 16mV and 18mV, overloaded to 120% output power after the output ripple has a certain increase, respectively, rose to 46mV, 23mV and 24mV, from the digital point of view there is some increase, but it belongs to the normal range, basically does not affect the performance performance, it can be seen that the power supply is indeed excellent in the suppression of output ripple.
Cross-load
In the cross-load test project, we developed an 850W power supply cross-load chart according to the requirements of the Intel ATX12V 2.52 and SSI EPS12V 2.92 power supply design guidelines.
It is worth noting that we did not copy the design specifications as they were, but only selected the four test points that are of practical significance, namely the four points of the lower left, upper left, upper right and lower right corners of the cross-load frame.
The meaning of these four points is as follows:
Lower left corner (A point): the minimum load of the whole machine;
Upper left corner (B point): the maximum load of the auxiliary circuit, the minimum load of 12V, such as the case of multiple mechanical hard disks starting at the same time;
Upper right corner (C point): maximum load of auxiliary circuit, full load of the whole machine;
Lower right corner (D point): 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 the sum of the output power of +5V and +3.3V.
The cross-load test is consistent with the previous uniform load test, the less the voltage deviation from the rating, the better, and the allowable value of each deviation rate is ±5%.
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Xianma XF 850W power supply in +5V and +3.3V output using DC to DC design, this design in the cross-load (tensile bias test) is more advantageous, basically in different load environments, the voltage changes of the three outputs are relatively small, and in different loads the performance is very consistent, almost no voltage fluctuations, the performance is very good.
Hold time
Hold-up Time refers to the 5% of the time allowed for the voltage output value to fall out of the range after the power is powered down, and we measure the hold time of +12V, +5V, and Power-OK (Power-Good) signals.
The output voltage hold time requirement in the SSI EPS12V 2.92 server power supply design guide is that the power supply should be greater than 18ms at 75% load, while the power-OK signal hold time requirement is greater than 17ms.
Power-OK to maintain 17ms means that the computer can continue to run without shutting down and restarting when facing a power failure within 17ms, and the voltage is maintained at 18ms or longer in order to make emergency treatment when the hardware can make emergency treatment when the power failure occurs, such as the head homing of the mechanical hard disk and the power loss protection of the SSD.
The hold time of the XF 850W power supply was measured at 75% load (DC output 637.5W).
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For +12V and +5V, the qualifying criteria are that the hold time is equal to or greater than 18ms, and the Power-OK (or PG, Power-Good) time should be equal to or greater than 17ms. The +12V hold time of the XF 850W power supply is 26ms, the +5V is 28ms, and the Power-OK is 21.2ms, and all three hold times are up to standard.
Xianma XF 850W power supply reviews
According to our current scoring standards, the XF 850W power supply has a super energy index of 92.24 points, which is a top-level power supply product, suitable for players who have the ultimate pursuit of power performance. In addition, the XF 850W is essentially a black diamond 850W power supply, so this achievement can also be seen as the super energy index of the black diamond 850W, and the current Xianma XF series and the Xianma black diamond series with the same power rating can be shared with each other in the super energy index.
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Judging from the current test data, the Xianma XF 850W power supply has excellent performance in output ripple, voltage stability, retention time and other aspects, basically there is nothing to be picky about, and the "true white" design also gives the XF series a higher value, it can be said that the high-end power supply of the xianma is improved in all aspects.
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The official price of the Xianma XF 850W is RMB859, while the 1000W and 750W products of the same series are priced at RMB999 and RMB759, both of which enjoy a 5-year warranty. If purely from the performance point of view, the XF series may not be as cost-effective as the Black Diamond series, if the player only pays attention to the performance of the power supply, the latter will be a more rational choice. But if you are also required for the appearance of the power supply on this basis, such as preparing to create a white theme host, or hoping that your host looks smaller and fresher, then the Xianma XF series will definitely make you feel at ease and enjoy it.
√ Pros:
- 80Plus Gold Certified
- Excellent output ripple control
- The output voltage is very stable
- Keep it for plenty of time
- Support fan intelligent shutdown
- True pure white design, high value
X Cons:
- Slightly lower price/performance ratio than the Black Diamond series
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