Laing/Xylem D5 and MCP65X Series Pumps
Price: Starting at $113.75
Bulk shipping information: 20 Pcs/Ctn

Product Options


Product Description

The MCP655 Series pumps are high reliability, high pressure industrial pumps, featuring a 50,000 hour MTBF (5 year lifetime). Such reliability is afforded by the unique design of the motor, which contains only one moving part: the magnetically driven spherical impeller spins on a single ceramic bearing, thus extending the life of this pump beyond existing standards.

The pumps are completely plug-and-play, and connect directly to the computer power-supply with a standard 4 pin power connectors. Depending on the model, the pump speed can be varied using the Motherboard PWM control. The MCP655 series compact design, quiet, reliable and powerful motor make them ideally suited for heavy duty liquid cooling applications where quiet operations are essential.


The MCP655 SERIES are available in 4 versions;  the PWM motor is also sold separately for use with third party housings, custom reservoirs, etc..The motor can be installed with any Laing/Xylem D5 compatible housing.
  • Pumps with PWM speed control and RPM signal cable :
    • MCP655-PWM-OEM - Features the original manufacturer housing.
    • MCP655-PWM-ACETAL - Features a custom Swiftech black acetal housing (also sold separately).
    • MCP655-PWM ACRYLIC - Features a custom Swiftech acrylic housing (also sold separately).
  • Pump without speed controller and without rpm signal cable: MCP655-B - Features the original manufacturer housing

Tab 1

  • 50,000 hours MTBF (Mean Time Between Failure) equivalent to 5 years lifetime
  • Superior 12 Volts DC convenience: plugs into the computer power supply
  • The MCP655 can be used with full confidence in any MP servers, and high-end workstations
  • Superior real world performance
  • High pressure capability of the MCP655 is particularly well adapted to high-flow systems using 1/2" ID tubing
  • The pump speed can be adjusted using the motherboard PWM signal (CPU_Fan header) to yield top performance or virtually silent operations (models MCP655-PWM-OEM/ACETAL/ACRYLIC only)
  • Compact Design.
  • Quiet operations even at high speed thanks to new chipset controller
  • ½" built-in barb fittings (MCP655-PWM-OEM, and MCP655-B models)
  • The pumps require no maintenance when used with de-mineralized water, and anti-fungal additives (Swiftech's HydrX additive is recommended).
  • The MCP655-PWM-ACRYLIC and PCP655-PWM ACETAL mounting brackets allow installation of the pump in either vertical, or horizontal orientation.
  • Four G1/4 threaded ports are present on the MCP655-PWM-ACRYLIC and PCP655-PWM ACETAL models, (fittings are not included):  users can configure the flow path in 3 possible settings: 1/Inlet on the pump face, outlet on the side face, or 2/ Inlet and outlet on the pump face, or 3/ Inlet and outlet on the side face.

Tab 2

MCP655 series performance Graph

"0-20 to 100%" denote the PWM settings on the MCP655-PWM models

"(B)" denotes the performance curve of the MCP655-B model

Tab 3

Nominal Voltage 12 V DC 12 V DC
Operating Voltage 8 to 24 V DC8 to 24 V DC 8 to 24 V DC8 to 24 V DC
Nominal Power (@ 12 V) 24 W 24 W
Nominal Current (@ 12 V) 2 Amps 2 Amps
Speed control Via motherboard PWM CPU_Fan signal - Note: pumps runs at full speed by default when PWM is not connected None
RPM signal & range Yes - 800 to 4800 rpm None
Motor Type Electronically Commutated DC Spherical Brushless Motor , with automatic overload protection and low in-rush current Electronically Commutated DC Spherical Brushless Motor , with automatic overload protection and low in-rush current
Nominal Head (@12v) ~ 13 ft (4 m) ~ 10 ft (3.1 m)
Nominal Discharge (@12v) ~ 330 GPH (1250 LPH) ~ 317 GPH (1200 LPH)
Connection Type (MCP655-PWM OEM) 1/2" barbs (10mm) 1/2" barbs (10mm)
Connection type (MCP655-PWM ACETAL & ACRYLIC G 1/4  ports (4) - fittings not included N/A
Maximum (working) Pressure 50 PSI (3.5 BAR) 50 PSI (3.5 BAR)
Temperature Range 32 °F to 140 °F (0 °C to 60 °C) 32 °F to 140 °F (0 °C to 60 °C)
Electrical Connector Molex 4-pin Molex 4-pin
PWM & RPM signal Mini 4-pin  N/A
Weight 1.4 LB (650 g) 1.4 LB (650 g)
Impeller  material Noryl Noryl


MCP655 Exploded view 


Tab 4

The MCP655-PWM-OEM and MCP655-B can either be installed with the built-in neoprene pad featuring a peel-off adhesive back, or permanently with thru-bolts as shown below.
Installation of the MCP655

Important warranty information: the warranty on these products is 2 years. 


Tab 5

bjorn 3d seal of approval

Link to Bjorn 3D's article

"Operation of the MCP655 was vibration and, almost, noise free. With the side on the chassis, we couldn't hear the pump. And with the side off of the chasis and with Velcro the only thing holding the pump in place, we could barely hear it at all." October 2008

+  Great Performance
+  Extra Headroom For Overclocking
+  Delrin top removes aluminum from system (no mixed metals)
+  Fantastic retaining system (even if you do have to remove the mother board)
+  Excellent craftsmanship

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