1st Player Steampunk PS-750SP 750 W Review 14

1st Player Steampunk PS-750SP 750 W Review

Load Regulation, Hold-up Time, Inrush Current, Efficiency & Noise »


We would like to thank 1st Player for supplying the review sample.

This is the first time I review a product from 1st Player, and I am curious to see what this PSU looks like internally and how it performs because it doesn't use a popular platform, but is based on an in-house design. This brand's parent company Helly Technology owns a manufacturing line, building its own power supplies, which can be a tremendous advantage.

The name of the line doesn't sound all that nice to my ears, but hopefully, the power supply will perform decently enough for me to forget such a small detail. Today's menu has as its main dish the Steampunk PS-750SP with a maximum capacity of 750 W. This is a fully modular power supply with two efficiency certifications, ETA-A from Cybenetics and 80 PLUS Gold. Cybenetics also gave the PS-750SP its LAMBDA-Standard++ certification for noise output.

Protection inside the small box is good since foam spacers surround the product.

Among others, the bundle includes a nice pouch used to store the modular cables.


1st Player PS-750SP Features & Specifications
Max. DC Output750 W
EfficiencyETA-A & 80 PLUS Gold
Modular✓ (fully)
Intel C6/C7 Power State Support
Operating Temperature0–40 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling140 mm Sleeve Bearing Fan D14SH-12
Semi-passive OperationNo
Dimensions150 mm (W) x 85 mm (H) x 160 mm (D)
Weight1.43 kg (3.15 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty7 years
Price at Time of Review (excl. VAT)$90

1st Player PS-750SP Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power15 A15 A63 A2.5 A0.3 A
100 W750 W12.5 W3.6 W
Total Max. Power750 W

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600 mm)1118AWGNo
4+4 pin EPS12V (600 mm)2218AWGNo
6+2 pin PCIe (500 mm+150 mm)2418AWGNo
SATA (450 mm+150 mm+150 mm)2618AWGNo
4-pin Molex (450 mm+150 mm+150 mm)1318AWGNo

With two EPS connectors, the PSU is compatible with high-end mainboards and energy-hungry CPUs, including AMD's Threadripper processors. The number of PCIe and peripheral connectors is sufficient. You will only need more 4-pin Molex connectors if you have lots of peripheral devices, like lights, AIO coolers, fan controllers, etc. Finally, at 150 mm, the distance between peripheral connectors is adequate.

Component Analysis

1st Player PS-750SP Parts Description
General Data
Manufacturer (OEM)1st Player
PCB TypeDouble Sided
Primary Side
Transient Filter4x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Bridge Rectifier(s)2x
Inrush Current ProtectionNTC Thermistor & Relay
APFC MOSFETs2x Oriental Semiconductor OSG55R140F(600 V, 14.5 A @ 100 °C, 0.14 Ohm)
APFC Boost Diode1x Global Power Technology G3S06508A (650 V, 8 A @ 150 °C)
Hold-up Cap(s)1x Rubycon (450 V, 470 uF, 2,000 h @ 105 °C MXH)
Main Switchers2x Oriental Semiconductor OSG55R140F (600 V, 14.5 A @ 100 °C, 0.14 Ohm)
APFC ControllerChampion CM6502UHHX
Resonant ControllerChampion CM6901T6
TopologyPrimary side: Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12 V4x Perfect Intelligent Power Semi PTP02N04N (40 V, 210 A @ 100 °C, 2 mOhm)
+5 V & +3.3 VDC-DC Converters: 4x Excelliance MOS Corp EMB06N03V (30 V, 18.5 A @ 100 °C, 6 mOhm)
PWM Controllers: 2x ANPEC APW7073
Filtering CapacitorsElectrolytics: 9x ChengX (2 - 4,000 h @ 105 °C, GR), 1x ChengX (3 - 8,000 h @ 105 °C, EL), 2x ChengX (1,000 h @ 105°C, ZF), 1x Asia'x (105°C, TNX)
Polymers: 12x
Supervisor ICSITI PS223 (OCP, OTP, OVP, UVP, SCP, PG)
Fan ModelYate Loon D14SH -12 (140 mm, +12 V, 0.70 A, Sleeve Bearing Fan)
5VSB Circuit
Rectifiers1x SB1045L (45 V, 10 A)
Standby PWM ControllerExcelliance MOS Corp EM8564A

It was high time we saw something new. Most brands nowadays either use Seasonic or CWT platforms, so it is good to have the chance to evaluate something different even if it might not be as good. The design is clean, without any cables blocking the airflow, and there is ample space between parts. The primary heatsinks are of moderate size, and there are only two small heatsinks for the +12V FETs on the secondary side. There are not very many electrolytic caps, and those 1st Player uses are of low quality.

The transient filter is complete, and the two bridge rectifiers are bolted to a dedicated heatsink.

There is an MOV for protection against voltage overshoots and spikes, and a thermistor lowers inrush currents. The thermistor is supported by a bypass relay.

The APFC converter uses a mid-sized cap that should offer a much longer hold-up time. However, the design results in a very low hold-up time.

The main FETs are arranged in a half-bridge topology, and an LLC resonant converter is also utilized to increase efficiency.

The +12V FETs are installed on small heatsinks. The same rail feeds two VRMs which generate the minor rails.

I am not fond of the ChengX caps. The good thing is that several polymer caps are also used for ripple suppression, and these are much more tolerant of high operating temperatures.

There is space for more caps, but only three are installed on the modular board.

The 5VSB circuit is depicted in the photos above.

The supervisor IC is a SITI PS223, one of the very few supporting OTP out of the box.

You won't find any parts on the solder side of the PCB. Soldering quality is good but for two joints with less than the necessary amount of solder holding the capacitive part of the LLC resonant converter in place.

The cooling fan uses a sleeve bearing. A fluid dynamic or—even better—double-ball fan should be used instead. Those Yate Loon fans are of low quality, but very affordable, which is why they are still around.
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