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Alphacool NexXxos Cool Answer 360 D5/UT Water Cooling Kit Review

Introduction and Technical Specifications


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Alphacool NexXxos Cool Answer 360 D5/UT kit
Courtesy of Alphacool

Alphacool is a German-based company, known in liquid cooling enthusiast's circles for their high performance and innovative product designs. Alphacool provided us with one of their NexXxos Cool Answer cooling kits, featuring one of their 360mm (3 x 120mm) UT copper radiators, a Repack dual bay acrylic reservoir with integrated VPP655 D5 pump, and the NexXxos XP3 Light CPU block. With a retail price of 314.95 euros (approximately $330 USD), the kit comes at a competitive price compared with other higher-end DIY kits.

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5.25 Dual Bay Reservoir
Courtesy of Alphacool

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NexXxoS UT60 Full Copper 360mm radiator
Courtesy of Alphacool

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NexXxos XP3 Light CPU Waterblock
Courtesy of Alphacool

XSPC bundled in many of their high end components into the NexXxos Cool Answer 360 D5/UT kit, including the NexXxos XP3 Light CPU block, the NexXxoS UT60 Full Copper 360mm triple fan radiator, the Repack 5.25 Dual Bay reservoir with integrated VPP655 D5 pump, three meters of 10mm (3/8") inner diameter / 13mm outer diameter clear tubing, six black chrome compression barbs, three 1200 RPM NB-eLoop - Bionic Lüfter fans, 1000ml of their CKC Cape Kelvin Catcher Clear coolant, and all the hardware necessary to put it all together. The Repack dual-bay reservoir has an anti-cyclon design on the inlets and directly feeds the rear-mounted D5 pump. The included VPP655 D5 pump is rated for a 350ml/hr flow rate. All components are copper, brass, Acetal, or acrylic to minimize the possibility of mixed-metal corrosion occurring in the loop.

Continue reading our review of the Alphacool NexXxos Cool Answer 360 D5/UT water cooling kit!

Technical Specifications (taken from the Alphacool website)

Alphacool NexXxos Cool Answer 360 D5/UT Kit
Hose dimensions 13/10mm
Prefilled No
Radiator Dimension 397 x 124 x 60mm
Radiator Thickness 60mm
Radiator size 3 x 120mm
Socket Support AMD
604 / 771 / G34, AMD 939 / AM2 / AM2 / AM3 / AM3 / FM1/ FM2

1150 / 1151 / 1155 / 1156, Intel 1366, Intel 2011, Intel 775

NexXxos XP3 Light CPU Waterblock
Weight 0.279 kg
Connection threads 2 x G1/4”
Material cooling plate Copper
Material top cover Plastic
Dimensions CPU water block
(L x W x H)
57 x 67 x 14mm without holder
63 x 73 x 14mm with holder
Compatible with Intel sockets 775, 1150, 1155, 1156, 1366, 2011 and AMD AM2 and AM3
NexXxoS UT60 Full Copper 360mm Radiator
Material internal Mostly copper
Material casing Side panels steel, threads brass, copper chambers
Colour Black
(L x W x H)
400 x 124 x 60 mm
Radiator size 3 x 120mm
Cooling channels Copper
Fins per inch 10
Thickness L - 60mm
Connection threads 6 x 1/4“
Outlet Connection threads 1 x 1/4“
Mounting thread size M3
Pressure tested 1.5bar
Weight 1958g
Repack 5.25 Dual Bay Reservoir
(W x H x D)
65 x 65 x 57mm (without connectors)
Model of reservoir 2 x 5 1/4" Bayres
Connector G1/4" inner thread
Fillport G1/4" inner thread
LED hole Available (for 5mm LEDs)
VPP655 D5 Pump
Motor Electronically commuted spherical motor
Rated voltage 12V DC
Power consumption 23W
Permitted voltage range 8 - 24V DC
Pressure head at 12V 3.7m
Maximum flow 1500l/h
Pumped media Water, water/glycol mixtures
Maximum system temperature 60°C
Materials Stainless steel 1.4571, PPS-GF40, EPDM O-rings, Aluminium oxide, hard coal
Special features Adjustable in five steps
Step 1: 1800 rpm
Step 2: 2550 rpm
Step 3: 3300 rpm
Step 4: 4050 rpm
Step 5: 4800 rpm
Power connector 4 Pin Molex
NB-eLoop 1200rpm - Bionic Fan
Air flow 76.22 m³/h
Air flow range 50 - 99 m³/h
Dimensions 120 x 120 x 25mm
Frame Color black
LED Not available
Lifespan (at 25°C) 150,000 h
Power connector 3 Pin Molex
Power input 0.85 W
Pressure 0.893mm H2O
RPM signal transmission Yes
Rated speed 1200 U/min
Rated speed range 1000 - 1450 U/min
Rotor color blue
Size 120mm
Start voltage 6V DC
Voltage rated 12V DC
Volume 16.1 dB(A)
Volume range 10 - 19.9 dB(A)
AlphaTube HF 13/10 Clear Tubing
Color Transparent
Inner diameter 10mm (3/8")
Length 3.00m
Material PVC
Max. Operating pressure 4 Bar (at 20°C)
Outer diameter 13mm (1/2")
Service temperature -20°C bis 60°C
UV - color Non UV-active

Video News

May 8, 2017 | 10:55 AM - Posted by bribri

Talk about not understanding your market. A 2x5.25" bay reservoir is a little bit passe these days no?

May 8, 2017 | 11:42 AM - Posted by Gunbuster

It would seem so, most new enthusiast cases don't even have 5.25 bays anymore.

May 8, 2017 | 05:45 PM - Posted by pdjblum

maury, would you please consider doing a review of a unit using quick connect couplings?

they would be the only thing that might, depending on your review, get me back to water cooling, which i gave up five years ago because of the hassle and the noise ironically

i have been using noctua's since, but really am curious whether it would be relatively easy and hassle free with the quick connects?

i suspect there is a flow problem with them, but maybe some company has sorted out that issue

May 8, 2017 | 11:46 PM - Posted by Morry Teitelman

I use quick connects on my test benched when doing the stand alone block reviews and have found that they do not impact performance. It really depends on which quick connects you use and what fittings / tubing you connect to them. I've had really good luck with the Alphacool HF quick connects and the Koolance quick connects as well. They do get pricey though...

May 9, 2017 | 01:38 PM - Posted by pdjblum

maybe you can do a video of building a water cooling loop with quick connects for novices?

May 9, 2017 | 01:20 AM - Posted by Hakuren

Perhaps passe a bit. However keep in mind that kit with old blocks and old bay res are very old by now. It belong to the old Alphacool before they basically sack everybody and hired new people with new ideas.

I would agree that old XP3 block is very high restriction block and it can't compete with top of the line performers like EK Supremacy, BP Summit or WC Heatkiller. But I find absolutely astounding that 1200 rpm e-loops can't deal with heat on 60mm 9FPI (!)rad. That does not compute. I'm using exclusively Alphacool rads U and X-flows and on one PC I'm running Scythe 500 rpm fans in push only on 60mm 480 with single AC D5 and I have no issues whatsoever. e-Loops are superb fans even at sub 800rpm they are perfect for low FPI rads. I don't know what's wrong with the setup but it simply isn't possible for 1200 rpm bionic fans to fail at removing heat from 9 FPI rad.

Heck I'm using e-Loops in push @750rpms on 16FPI X-Flows and they are perfect in every way. Either pump is crap or its crap. :D

May 9, 2017 | 10:19 AM - Posted by Morry Teitelman

I think the performance issue seen in testing was more with the low flow of the pump in combination with the thickness of the radiator, made for a "perfect storm" of sorts...

May 11, 2017 | 03:00 AM - Posted by Pholostan

Strange, that looks like the standard D5 VPP655 pump. Did you get a broken pump or something? Looking at your picture of the back of the res and the D5, it sure looks like their standard VPP655, a 1500 l/h pump. It should go to like 4800 rpm at the highest setting.

Datasheet for the D5 VPP655:

Product page:

The motor of the water cooling system: The pump
Alphacool has combined the proven VPP655 pump technology with a new generation of the Repack reservoir.The pump is installed in a space-saving manner at the back of the reservoir. Coming with an impressive pressure head of 3.7m and a maximum flow rate of 1500l/h, this is a true performance pump.This makes it the ideal pump for larger loops with multiple water blocks, e.g. on the Mainboard and graphics card.

Edit: Looks like when I link directly to their English site, it changes to their German one in an incognito window. Needs to set a cookie or something by clicking the UK flag upper right corner.

May 11, 2017 | 08:53 AM - Posted by Morry Teitelman

The odd thing is that their page lists two different max flow rates, depending on which page you look at.  The Description page shows a flow of 350 l/h, while the tech spec page lists it at 1400 l/h.  In any case, something was severely impacting the performance of the kit.

Found on this page on alphacool site:

May 11, 2017 | 01:25 PM - Posted by Pholostan

The 350 figure must be a typo in the description, they have miss-spelled words too here and there. Also mixing English/German in a chaotic manner? Sheesh, when will they fix their site... Anyway, the "Technische Details" tab say 1500, same in the datasheet.

This datasheet has both the VPP655 and the VPP644:
This one seems to be for the PWM controlled version:

In any case, something was severely impacting the performance of the kit.

I don't doubt that, performance was surely sub-par. That 90 degree bend at the back of the res that you mentioned on the podcast probably doesn't help. And that XP3 block looks like a highly restrictive design, probably needs the pump at max rpm. Might work better with one of those high pressure DDCs like Swiftech MCP35X or MCP50X. I have a MCP35X and it can power through pretty much everything. Drawback is the DDC whine at high RPM, I'd take a D5 over that any day. All DDC pumps I've used have had that high pitched whine when over ~3000 RPM. A D5 is heaven in comparison, even at max RPM I can't hear it outside the case.

Thanks for doing some custom loop stuff reviews, I appreciate it :-)

May 11, 2017 | 02:42 PM - Posted by Morry Teitelman

Thanks for the additional information Pholostan.  I've updated some information in the review to better elaborate on the kit's performance mysteries as well as updating the pump flow rate numbers...

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