At the beginning of December 2021, Xianma launched the black diamond series of power supply products, and its first 1000W style is not only attractive in price, but more importantly, it has greatly improved its performance compared with Xianma's previous products, and has entered the first echelon of the high-end market, which can be said to be a PC power supply that is satisfactory in all aspects. Therefore, the black diamond series power supply not only refreshes our understanding of the first horse, but also gives the first horse enough confidence to stand firm in the high-end market.
The thing that followed was naturally to hit the iron while it was hot, and Xianma soon added a new member to the Black Diamond series, and its 750W and 850W models are now officially available. These two power supplies and Black Diamond 1000W for brother products, are 14cm length of the standard ATX power supply, full module interface design, passed the 80Plus gold certification, priced at 649 yuan and 749 yuan, respectively, enjoy 5 years warranty (the first 3 years of replacement, the last 2 years of maintenance) service, we want to see today is the 750W style, which is also the black diamond series of power supplies for the mainstream platform of the key products.
First horse black diamond 750W power appreciation
The specific model of the Xianma Black Diamond 750W power supply is KTX-750-1, if you check the model on the official website of 80Plus, you will see that Xianma has two KTX-750-1 power supplies, which are 2019 and 2021 versions, the former passed the 80Plus gold certification, while the latter passed the 80Plus platinum certification. The Black Diamond 750W, the 2021 version of the KTX-750-1, is a power supply "decentralized" from the 80Plus Platinum certification level to the 80Plus Gold certification level.
Black Diamond 750W adopts the same appearance as Black Diamond 1000W, belongs to the 14cm length of the standard ATX power supply, full module interface design, equipped with a 12cm diameter cooling fan, support fan intelligent stop technology, can be switched back to the conventional temperature control mode through an independent switch, with its own not high heat, can be kept low in use.
Black Diamond 750W power supply adopts a single +12V output design, +12V output rated current of 62A, equivalent to 744W power, +5V and +3.3V through the DC-DC way from +12V, the output rated current is 20A, the combined output power is 100W, +5V standby supports 3A current output.
The power supply uses a 12025-gauge FDB dynamic bearing fan for heat dissipation
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 cable design, the module interface is roughly divided into three groups, the combination of 10 + 18pin is used to expand the main power supply of 24pin, 5 8pin interfaces are used to expand the CPU power supply interface and PCI-E power supply interface, and 4 6pin interfaces are used to expand the D type 4pin and SATA power supply interface, providing a total of 1 24pin main power supply (line length 610mm), 2 4 + 4pin CPU power supply (line length 650mm), 4 PCI-E 6+ 2 pin power supply (line length 675+85mm), 8 SATA power supply and 6 D type 4pin power supply interfaces are more than enough for mainstream platforms, even if it is easy to deal with high-end platforms.
The module cable can be stored in the included cloth bag
First horse black diamond 750W power supply outer packaging
First horse black diamond 750W power supply disassembly appreciation
The cooling fan used in the 750W power supply of Xianma Black Diamond comes from POWERYEAR, the model is PY-1225L12S, the specification is DC12V/0.2A, the FDB dynamic hydraulic bearing is adopted, the 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 black diamond 750W power supply is the same as that of the black diamond 1000W, which adopts 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.
There are no placement elements on the back of the main PCB
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
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 solid capacitors for filtering, MosFET has a total of 4, rectifier and freewheeling tube 2 each, the surface of the labeled model is 014N04A, but the specific specifications are not queried, through the next metal sheet for heat dissipation, in addition, the main PCB back of the corresponding position is attached to the thermal paste, you can guide the heat to the power supply shell 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 the specific specifications can not be queried, and the metal sheet behind it can play an auxiliary role in heat dissipation.
Located in front of the DC-DC module is the LLC resonant master CM6901T6X
The power module interface adopts in-line PCB and solid capacitors for output filtering
First horse black diamond 750W power 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.
It was determined that the OPP over-power protection point of the Xianma Black Diamond 750W power supply was determined to be 1104W, 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
The Xianma Black Diamond 750W power supply is ostensibly a power supply that has passed the 80Plus Gold certification, but it is actually 80Plus Platinum certification, so the Xianma Black Diamond 750W is actually a "devolved" product. In the 230V input environment, the output of 50W conversion efficiency in about 80%, output 100W conversion efficiency in about 89%, from the output of 150W can always maintain more than 91% conversion efficiency, the highest time more than 94%, even in the case of overload to 900W can maintain more than 93% conversion efficiency, the overall average conversion efficiency of the output is more than 92%; the maximum conversion efficiency under 115V input is more than 93%, the full load efficiency is at the level of 91%. It has indeed reached the efficiency standard of 80Plus Platinum power supplies.
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 750W power supply of The First Horse Black Diamond is 0.15W, and the +5V standby output voltage is sufficient, and the conversion efficiency is excellent.
Cooling fan speed
The cooling fan used in the 750W power supply of Xianma Black Diamond is POWERYEAR's PY-1225L12S, which has been measured by us to have a maximum air volume of 67.9CFM and a maximum wind pressure of 2.7mmH2O.
Xianma Black Diamond 750W power supply supports fan intelligent start and stop function, the fan will automatically stop in the case of low temperature and low load, or it can 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 fan shutdown state in most of the working time, until the output power reaches 700W after the fan starts to run, the starting speed is about 1000RPM, and when fully loaded, it is at the level of 1200RPM, and the noise is very slight. In the conventional temperature control mode, the power supply will maintain a fan speed of about 700RPM from the start of the machine, and only after the output reaches half load does it begin to have a significant increase in speed, and the full load is also at the level of 1200RPM, and the entire operation process is quite quiet.
Voltage stability
The output voltage of the 750W power supply of The First Horse Black Diamond is very stable, of which the voltage deviation of +12V and +5V does not exceed 1%, and the voltage deviation of +3.3V output does not exceed 2%; the performance of the adjustment rate is more prominent, and the three outputs can be maintained within 1%, which is indeed very good.
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.
Black Diamond 750W power supply at 100% full load of +12V, +5V, +3.3V low frequency ripple is 39mV, 18mV and 17mV, overloaded to 120% output power after the output ripple has a certain increase, respectively, up to 48mV, 25mV and 25mV, 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
For the cross-load test project, we developed a 750W 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 (point A): minimum load of the whole machine; upper left corner (point B): maximum load of the auxiliary circuit, minimum load of 12V, such as the case of multiple mechanical hard disks starting at the same time; upper right corner (point C): maximum load of the auxiliary circuit, full load of the whole machine; lower right corner (D point): 12V maximum load, minimum load of the auxiliary circuit, such as the use of a single SSD to run 3D games;
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%.
Xianma Black Diamond 750W power supply in the +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 750W power supply of The First Horse Black Diamond was measured at 75% load (DC output 562.5W).
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 750W power supply of the First Horse Black Diamond is 23.8ms, the +5V is 26.2ms, and the Power-OK is 19ms, and all three hold times are up to standard.
First Horse Black Diamond 750W Power Review
According to our current scoring standards, the power index of the First Horse Black Diamond 750W power supply is 91.05 points, which is a top-level power supply product, suitable for players who have the ultimate pursuit of power performance.
The structural scheme used in the Xianma Black Diamond 750W is the same as that of the Black Diamond 1000W, but the material is adjusted according to the different rated power, so in theory, the performance of the two should be relatively close, and the actual test results are the same. Black Diamond 750W power supply has excellent performance in output ripple, voltage stability, retention time and other aspects, further laying a solid foundation for the excellent image of the Xianma Black Diamond series.
Power Mini Ladder List
At present, the First Horse Black Diamond 750W has been officially released, the official price is 649 yuan, can enjoy a 5-year warranty (the first 3 years of replacement, the last 2 years of maintenance) service, from its performance and price point of view, the cost performance is still relatively prominent, for the mainstream platform and even high-end platform players, are called a reliable and affordable choice.
√ Pros:
- 80Plus Gold Certification- Excellent Output Ripple Control- Very Stable Output Voltage- Sufficient Holding Time- Support Fan Intelligent Shutdown- Affordable Price, 5 Years Warranty, Cost-Effective
X Cons:
- No obvious drawbacks