Zalman 750W Heatpipe Cooled PSU - ZM750-HP Features and Specs

Article Index
Zalman 750W Heatpipe Cooled PSU
ZM750-HP Features and Specs
ZM750-HP Cables and Inside
Test Setup, Methods and Testing
550W Tests and Final Thoughts

Features & Specs:

Zalman is more known for its cooling products than for its Power Supplies, but with their products now reaching 1000W, they are starting to get seriously noticed by the enthusiast community.  While they don't yet have the same reputation as Antec or Enermax, they are building a reputation that should take them into the cases of many computer gamers in the near future.  Below is a list of the features of this unit according to Zalman.

Dual Heatpipes Installed for Maximum Cooling Performance and Ultra-Quiet Operation
A heatpipe with ultra-high cooling performance incorporated on the power supply’s main rectifiers enables high load operation even at low RPM for a dramatic reduction in noise levels.
Improved Power Factor & Reduced Harmonics through Active PFC
By implementing Active PFC (Power Factor Correction), the Power Factor(PF) is improved up to 99% while harmful harmonic frequencies are reduced to meet the Line Harmonic Distortion Requirement of IEC61000-3-2 Class D.
High Efficiency Design and 80 PLUS Certified
This power supply is capable of reaching a maximum of 86% efficiency (230VAC, Full & Typical Load) through its use of high switching frequency and low power-loss circuitry. This product has been certified with the 80 PLUS Power Supply Certification and guarantees a higher efficiency compared to uncertified products.
ATX20+4 Pin Main Connector
ATX20+4 pin main connector broadens the range of motherboard compatibility.
Supports ATX12V CPU 4-Pin and EPS12V CPU 8-Pin
Two ATX12V CPU 2×2(4-Pin) power cables can be combined to form an EPS12V CPU 8 Pin power cable.
6 Pin Power Connector for Two PCI Express Graphic Cards
Two independent 6-Pin power connectors fully support Nvidia’s SLI.
Module Cables
Modular cables provide organized cable management and improved air circulation inside the computer case.
Ultra Quiet 120mm Fan
The ultra quiet 2 ball-bearing 120mm fan maximizes the airflow and minimizes the noise level enabling a noiseless computing environment with optimized cooling.
Four Independent +12VDC Outputs
Four +12VDC rails supply power independently to the CPU, VGA, motherboard, and peripheral components for the highest level of stability and performance.
EZ Grip Connectors for ODDs & HDDs
EZ Grip Connectors for easy removal of the plugs from ODDs & HDDs.
Gold-Plated Terminals and 16AWG Wires
All connector terminals are gold-plated to minimize contact resistance and power lose. 16AWG (thicker than 18 AWG)wires are incorporated to minimize voltage drop during high load operation.
Sleeved Cables
All power cables are sleeved for easy cable management and improved air circulation inside the computer case.
Multiple Safety Features
Over-Voltage Protection, Over-Current Protection, Short-Circuit Protection, Under-Voltage Protection, and Over-Temperature Protection.
Internal Blue LED
Blue LEDs are installed inside the power supply for cool aesthetics.
Complies with WEEE & RoHS environmental directives of the European Union.

- WEEE (Waste Electrical and Electronic Equipment)
- RoHS (Restriction of Hazardous Substances)

While this PSU is not the most powerful unit on the market, it according to the label it has enough wattage for many systems running the latest games today.

 PSU Label
PSU Label


More detailed information in the chart below.


Electrical & Physical Characteristics
AC Input Range Voltage 100VAC ~ 240VAC ±10% DC Output
Frequency 47Hz~63Hz ZM750-HP
AC Input Current
115VAC 12A Output V. Output Load Rating Combined
230VAC 5.5A Imin Imax Ipeak
PFC Type Active PFC +3.3V 0.8A 30A   160W 750W
Power Factor 99% Maximum
+5V 0.5A 30A  
Inrush Current Limit
(@ Cold start at 25°C)
115VAC 60A +12V1 0.5A 20A   720W
230VAC 100A +12V2 0.5A 20A  
Efficiency 86% Maximum @230VAC, Full & Typical load
+12V3 0.5A 20A  
DC Output
Output V. Regulation Range At Full
+12V4 0.5A 20A  
+3.3V ±5% +3.14V~+3.47V -12V 0.0A 0.8A   22.1W
+5V ±5% +4.75V~+5.25V +5VSB 0.0A 2.5A 3.5A
+12V1 ±5% +11.4V~+12.6V Protection Features
+12V2 ±5% +11.4V~+12.6V Over Voltage Protection(OVP)
+12V3 ±5% +11.4V~+12.6V Over Current Protection(OCP)
+12V4 ±5% +11.4V~+12.6V Short Circuit Protection(SCP)
-12V ±10% -10.8V~-13.0V Over Temperature Protection(OTP)
+5VSB ±5% +4.75V~+5.25V Under Voltage Protection(UVP)
DC Output
& Noise
Output V. Specification At Full
Ambient Temperature
+3.3V 80mV Operation 0°C ~ +50°C
+5V 80mV Storage -20°C ~ +80°C
+12V1 150mV Ambient Humidity
+12V2 150mV Operation 5%RH ~ 95%RH
+12V3 150mV Storage 5%RH ~ 95%RH
+12V4 150mV Dimensions
-12V 150mV 165(L) x 150(W) x 86(H) mm
+5VSB 80mV MTBF(25°C) 100,000 hours


If you were paying attention to the little details, you'd notice that the actual values of the PSU indicate that it is actually capable of much more power that 750W.  We did the math on all of the rails (AMP * Volts = Watts) and came up with a total of 1231W.  Now, there is no way that this PSU can actually sustain such a load, but according to the AMP rating, the components are capable of this.  You'll also notice another interesting thing in the table above.  Zalman has relaxed their DC Output Ripple & Noise requirements of this unit.  Typical ATX specs say that 3.3v and 5v shouldn't exceed 50mV and all 12v lines shouldn't exceed 120mV.  Zalman's ZM850-HP follows these specs, but the specs for the ZM750-HP are a bit more open.  All voltage rails have been relaxed 30mV, bringing the 3.3v and 5v lines to 80mV and the 12v lines to 150mV.  If this PSU has this much ripple and noise it won't be a good thing.  Only testing will tell.

We'll take a closer look at the cables and tear into this unit on the next page.