FSP Hydro PTM 650 W Review 6

FSP Hydro PTM 650 W Review

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


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We would like to thank FSP for supplying the review sample.

The FSP Hydro PTM with 650 W maximum power output is a mid-capacity power supply for enthusiast users who don't mind spending a little more to get an efficient unit with good build quality and a nice external design. The HPT650M can easily support a system equipped with a potent CPU and high-end graphics card. Should you need to power a pair of energy hungry GPUs, you better invest in a stronger power supply.

The HPT650M is Platinum and ETA-A certified by 80 PLUS and Cybenetics labs respectively. It also has a LAMBDA-A noise certification, which shows that it operates quietly overall. The 135 mm fluid dynamic bearing fan FSP uses might not be supported by a semi-passive operation, but is driven by a relaxed fan speed profile.


FSP HPT650M Features & Specifications
Max. DC Output650 W
EfficiencyETA-A & 80 PLUS Platinum
Intel C6/C7 Power State Support
Operating temperature0 °C - 50 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling135 mm Fluid Dynamic Bearing Fan (MGA13512HF-A25)
Semi-passive Operation
Dimensions152 mm (W) x 88 mm (H) x 172 mm (D)
Weight1.7 kg (3.75 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty10 Years
Price at Time of Review (excl. VAT)$119.99

All necessary protection features are included, and the ten-year warranty shows FSP's faith in the Hydro PTM 650 W. Finally, the unit's dimensions are quite large given the similar Seasonic Focus is only 140 mm deep.

FSP HPT650M Power Specs
Max. Power20 A20 A54.17 A2.5 A0.3 A
120 W650 W12.5 W3.6 W
Total Max. Power650 W

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600 mm)1118-22AWGNo
8 pin EPS12V (700 mm) / 4+4 EPS12V (+150 mm)11 / 118AWGNo
6+2 pin PCIe (650 mm+150 mm) 1218AWGNo
6+2 pin PCIe (500 mm+150 mm) 1218AWGNo
SATA (500 mm+150 mm+150 mm+150 mm)2818AWGNo
SATA (500 mm+150 mm) / 4-pin Molex (150 mm+100 mm)12 / 218AWGNo
SATA (500 mm+150 mm) / 4-pin Molex (150 mm) / FDD (+150 mm)12 / 1 / 118-22AWGNo
AC Power Cord (1400 mm) - C13 coupler1116AWG-

All cables are fully modular and sufficiently long. The inclusion of two EPS connectors is an advantage since it ensures compatibility with server and several high-end, single-socket motherboards in need of more power for the CPU area. A notable disadvantage is that both EPS connectors are on the same cable. A single EPS connector can deliver up to 336 W so even if thicker (16AWG) gauges were used, the cable still wouldn't be able to handle the full output of two EPS connectors.

The number of PCIe and peripheral connectors is high enough for a 650 W unit, and the distance between those is sufficient at 150 mm (it could be less between PCIe connectors). Lastly, the FDD connector could be replaced with a 4-pin Molex connector since most users won't use it anyway.

Component Analysis

FSP HPT650M Parts Description
General Data
Manufacturer (OEM)FSP
Platform ModelPTM
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x SEN013DG
Bridge Rectifier(s)1x GBJ1506 (600 V, 15 A @ 100 °C)
Inrush Current ProtectionNTC Thermistor & Relay
APFC MOSFETs2x STMicroelectronics STFH24N60M2 (650 V, 12 A @ 100 C°, 0.19 Ohm)
APFC Boost Diode1x STMicroelectronics STPSC6H065D (650 V, 6 A @ 110 °C)
Hold-up Cap(s)2x Nichicon GG (450 V, 270 uF each or 540 uF combined, 2000 h @ 105 °C)
Main Switchers2x STMicroelectronics STFH24N60M2 (650 V, 12 A @ 100 °C, 0.19 Ohm)
APFC ControllerInfineon ICE2PCS02 
Supporting IC: Fairchild KA393
Driver IC1x Silicon Labs Si8233BD
Resonant ControllerChampion CM6901T2X
TopologyPrimary side: Half-Bridge & LLC Resonant Controller
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETS2x Toshiba TPHR85 04PL (SOP Advance Series, 40 V, 150 A @ 25C°, 0.85 mOhm )
5V & 3.3VDC-DC Converters: 6x Infineon BSC0901NS (30 V, 94 A @ 100 °C, 1.9 mOhm)
PWM Controller: APW7159C
Filtering CapacitorsElectrolytics: 6x KZE (1-5000h @ 105 °C), Rubycon ZLH (6-10000h @ 105 °C)
Polymers: Teapo (Taiwan)
Supervisor ICSITI PS223 (OCP, OTP, OVP, UVP, SCP, PG)
Fan ModelProtechnic Electric MGA13512HF-A25 (135 mm, 12 V, 0.28 A, FDB)
5VSB Circuit
Rectifying DiodeInternational Rectifier IRFR1018E (60V, 56A @ 100 °C, 8.4 mOhm)
Standby PWM ControllerPower Integrations SC1225K

The platform uses a modern design. The primary side has a half-bridge topology along with an LLC resonant converter, while a synchronous rectification scheme and two DC-DC converters for the minor rails are used for the secondary side. However, the number of cables for power transfer purposes shows that the implementation could be better. In other modern platform, those cables have been replaced by thick PCB traces and/or bus bars, which increases internal airflow and leads to better thermal management.

The electrolytic caps are provided by Chemi-Con and Rubycon, and a number of polymer Teapo caps are also used. Some would expect nothing but Japanese caps in this price range, but Teapo caps are of generally good quality, and polymer caps can easily operate under tough conditions for long periods of time.

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Jun 30th, 2022 12:57 EDT change timezone

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