Alphacool VPP655 Review

Watercooling has been established as an advanced way to efficiently cool your system. One of the parts the user will need to setup a water cooling system is the water pump. Today we are testing the Alphacool VPP655, one of the big players in the cooling market.


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Alphacool was founded in 2003 in Germany and they focus on producing high quality PC cooling products and accessories.
Before we start the presentation, there is a very helpful installation guide with pictures here.

Let’s take a quick look at the Alphacool VPP655 specs and features:


• Size: 65 x 65 x 57mm
• Operating voltage range: 8 to 24VDC
• Nominal voltage: 12 V DC
• Nominal Power (@12V): 24W
• Nominal current (@12V): 2 amps
• Maxium head: 10 ft (3.1 m)
• Nominal discharge (@12V): ~ 317 GPH -1200 LPH (Variable)
• Connection size: 1/2” barbs (12mm)
• Maximum pressure: 50 PSI (3.5 BAR)
• Temperature range: Up to 140°F (60°C)
• Electrical connector: Molex 4pin
• Motor type: Brushless, microprocessor controlled
• MTBF: 50,000 Hours
• Weight: 1.4 LB, 650g
• Compact size allows installation almost anywhere in the case


• 50,000 hours MTBF (Mean Time Between Failure) equivalent to 5 years lifetime.
• Superior 12 Volts DC convenience: plugs into the computer power supply
• Superior real world performance
• Pump speed can be adjusted to yield top performance or virtually silent operations
• Compact Design.
• Quiet operations even at high speed thanks to new chipset controller
• ½” Barb fittings.
• No maintenance when used with de-mineralized water, and anti-fungal additives (Our HydrX™ additive is recommended)
• Quick installation with adhesive neoprene pad, or permanent installation with thru-bolts.


A Closer Look – Package and Accessories

Not much to say here – the Alphacool VPP655 came in a simple white cardbox with no accessories. Inside you will find the water pump only.


A Closer Look – The Pump

The Alphacool VPP655 has a solid construction and is well-made. The body color is black and at the front side we can see the Alphacool logo along with some technical specs at the bottom.

The pump size is considered compact and it will fit in most PC cases with no problems.

The mounting of the pump is very easy, using the frame base. The cable length is also long enough so that it can be connected everywhere easily.

The pump used is the well-known Laing D5 Vario.

Here we can see the adjusting knob for the pump’s RPM. There are five settings:
Step 1: 1800 rpm
Step 2: 2550 rpm
Step 3: 3300 rpm
Step 4: 4050 rpm
Step 5: 4800 rpm

This is very handy, as the user can balance performance and noise levels easily.


Test Setup and Procedures

The machine on which we tested the pump is:

Processor: Intel Core i7 920
Motherboard: Asus P6X85D Premium
RAM: Mushkin Redline 6GB-998691
VGA: Gigabyte GTX480 1536MB
HDD: Velocity Raptor 150GB
PSU: Nexus 1000W
Case: Thermaltake Armor VA8003BWS
Operating System: Windows 7 64-bit

The parts for testing along with the pump were:


We tested Alphacool’s pump against:


  • Aquacomputer Aquastream XT USB 12V Pump- Ultra Version 
  • Watercool 1046-12Volt
  • Phobya DC12-400 12Volt 


The tests we took included:


  • Waterflow (Litre / Hour)
  • Price Comparison


Test Results

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At our waterflow tests, Alphacool’s VPP655 managed the best performance, achieving 134 litres/hour, with Phobya’s DC12-400 being close at 120 litres.

Well, performance is something that is usually paid. The VPP655 was the most expensive among the four contestants, together with Aquacomputer’s Aquastream Ultra.



The Alphacool VPP655 proved to be a reliable and powerful waterpump, with a solid build quality, that can easily integrate with the majority of the waterblocks out in the market. Installation was relatively easy and will not trouble the user. The  pump produces much higher head pressure from the other competitors, which translates to higher flow rate and makes it well suited for applications using multiple waterblocks. The adjustable RPM is also a plus, as you can adjust pump performance to your needs. During operation, the pump was silent, even at the highest RPM setting. While there are cheaper solutions in the marker, you surely get what you pay for, as the performance of this pump is impressive.


(+) Top performance
(+) Easy to install
(+) Solid build quality
(+) Compact size
(+) Quiet operation, adjustable RPM


(-) Price, but you get what you pay for


Thus, we can surely give the Alphacool VP655 our Performance Award.


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