[nextpage title=”Introduction”]

The CPU cooler we are testing today is the Gammaxx 400, which has a tower heatsink with four U-shaped heatpipes and one 120 mm fan. Although this cooler is manufactured by Deepcool, it may be found in the U.S. under the Logisys brand.

The box of the Gammaxx 400 uses the typical white-and-blue pattern from other Deepcool products. You can see the box in Figure 1.

Deepcool Gammaxx 400Figure 1: Package

Figure 2 shows the contents of the box: heatsink, fan, a small bag of thermal compound, a manual, and installation hardware. The cooler comes with only one fan, but you can install a second optional 120 mm fan; the wire clips to install the second fan are included.

Deepcool Gammaxx 400Figure 2: Accessories

Figure 3 displays the Gammaxx 400 heatsink.

Deepcool Gammaxx 400Figure 3: The Gammaxx 400

This cooler is discussed in detail in the following pages.

[nextpage title=”The Deepcool Gammaxx 400″]

Figure 4 illustrates the front of the cooler. You can see that the lower fins are shorter than the other ones in order to improve the compatibility with most motherboards.

Deepcool Gammaxx 400Figure 4: Front view

Figure 5 reveals the side of the cooler.

Deepcool Gammaxx 400Figure 5: Side view

Viewed from the top, the cooler shows the tips of the heatpipes and the rectangular shape of the fins.

Deepcool Gammaxx 400Figure 6: Top view

[nextpage title=”The Deepcool Gammaxx 400 (Cont’d)”]

The semi-transparent 120 mm fan is shown in Figure 7. It uses a four-pin connector, which means it is PWM compatible. This fan has four blue LEDs.

Deepcool Gammaxx 400Figure 7: Fan

On the Gammaxx 400, the heatpipes directly touch the CPU. Figure 8 shows the base of the cooler; you can see that the base has no reflexive finishing.

Deepcool Gammaxx 400Figure 8: Base

[nextpage title=”Installation”]

For use on AMD systems, the Gammaxx 400 is held in place by a pressure clip that grabs the motherboard frame. On Intel CPUs you must attach two clips (shown in Figure 9) to the base of the cooler.

Deepcool Gammaxx 400Figure 9: Clips installed

With those clips, the installation is similar to the Intel stock cooler.

Deepcool Gammaxx 400Figure 10: Heatsink installed

After installing the heatsink over the CPU, just install the fan, as shown in Figure 11.

Deepcool Gammaxx 400Figure 11: Cooler installed

[nextpage title=”How We Tested”]

We tested the cooler with a Core i5-2500K CPU (quad-core, 3.3 GHz), which is a socket LGA1155 processor with a 95 W TDP (Thermal Design Power). In order to get higher thermal dissipation, we overclocked it to 4.0 GHz (100 MHz base clock and x40 multiplier), with 1.3 V core voltage (Vcore). This CPU was able to reach 4.8 GHz with its default core voltage, but at this setting, the processor enters thermal throttling when using mainstream coolers, reducing the clock and thus the thermal dissipation. This could interfere with the temperature readings, so we chose to maintain a moderate overclocking.

We measured noise and temperature with the CPU under full load. In order to get 100% CPU usage in all cores, we ran Prime 95 25.11 with the “In-place Large FFTs” option. (In this version, the software uses all available threads.)

We compared the tested cooler to other coolers we already tested. Note that the results cannot be compared to measures taken on a different hardware configuration, so we retested some “old” coolers with this new methodology. This means you can find different values in older reviews than the values you will read on the next page. Every cooler was tested with the thermal compound that comes with it.

Room temperature measurements were taken with a digital thermometer. The core temperature was read with the SpeedFan program (available from the CPU thermal sensors), using an arithmetic average of the core temperature readings.

During the tests, the panels of the computer case were closed. The front and rear case fans were spinning at minimum speed in order to simulate the “normal” cooler use on a well-ventilated case. We assume that is the common setup used by a cooling enthusiast or overclocker.

The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed near the top opening of the case. This measurement is only for comparison purposes, because a precise SPL measurement needs to be made inside an acoustically insulated room with no other noise sources, which is not the case here.

Hardware Configuration

Operating System Configuration

  • Windows 7 Home Premium 64 bit SP1

Software Used

Error Margin

We adopted a 2°C error margin, meaning temperature differences below 2°C are considered irrelevant.

[nextpage title=”Our Tests”]

The table below presents the results of our measurements. We repeated the same test on all coolers listed below. Each measurement was taken with the CPU at full load. In the models with a fan supporting PWM, the motherboard controlled the fan speed according to core load and temperature. On coolers with an integrated fan controller, the fan was set at the full speed.

Cooler Room Temp. Noise Speed Core Temp. Temp. Diff.
Cooler Master Hyper TX3 18 °C 50 dBA 2850 rpm 69 °C 51 °C
Corsair A70 23 °C 51 dBA 2000 rpm 66 °C 43 °C
Corsair H100 26 °C 62 dBA 2000 rpm 64 °C 38 °C
EVGA Superclock 26 °C 57 dBA 2550 rpm 67 °C 41 °C
NZXT HAVIK 140 20 °C 46 dBA 1250 rpm 65 °C 45 °C
Thermalright True Spirit 120 26 °C 42 dBA 1500 rpm 82 °C 56 °C
Zalman CNPS12X 26 °C 43 dBA 1200 rpm 71 °C 45 °C
Zalman CNPS9900 Max 20 °C 51 dBA 1700 rpm 62 °C 42 °C
Titan Fenrir Siberia Edition 22 °C 50 dBA 2400 rpm 65 °C 43 °C
SilenX EFZ-120HA5 18 °C 44 dBA 1500 rpm 70 °C 52 °C
Noctua NH-L12 20 °C 44 dBA 1450 rpm 70 °C 50 °C
Zalman CNPS8900 Extreme 21 °C 53 dBA 2550 rpm 71 °C 50 °C
Gamer Storm Assassin 15 °C 48 dBA 1450 rpm 58 °C 43 °C
Deepcool Gammaxx 400 15 °C 44 dBA 1500 rpm 60 °C 45 °C

In the graph below, you can see how many degrees Celsius hotter the CPU core is than the air outside the case. The lower this difference, the better is the performance of the cooler.

Deepcool Gammaxx 400

In the graph below, you can see how many decibels of noise each cooler makes.

Deepcool Gammaxx 400

[nextpage title=”Main Specifications”]

The main specifications for the Deepcool Gammaxx 400 CPU cooler include:

  • Application: Sockets 775, 1155, 1156, 1366, 2011, AM2, AM2+, AM3, AM3+, and FM1 processors
  • Dimensions: 5.3 x 3.0 x 6.3 inches (135 x 76 x 159 mm) (W x L x H)
  • Fins: Aluminum
  • Base: Aluminum, with heatpipes touching the CPU directly
  • Heat-pipes: Four 6-mm copper heatpipes
  • Fan: 120 mm
  • Nominal fan speed: 1,500 rpm
  • Fan air flow: 60.29 cfm
  • Maximum power consumption: 3.0 W
  • Nominal noise level: 32.1 dBA
  • Weight: 1.41 lb (638 g)
  • More information: http://www.deepcool-us.com
  • MSRP in the U.S.: USD 30.00

[nextpage title=”Conclusions”]

The Deepcool Gammaxx 400 is an excellent CPU cooler, with high cooling performance and a very low noise level. It is also easy to install and remove, and relatively inexpensive.

However, the easy installation system is also the weak point of the Gammaxx 400. Some users simply hate stock-like pressure clips, because they can bend the motherboard and, in some cases, expelled from the hole.

For its good cooling performance with quiet operation, the Deepcool Gammaxx 400 receives our Silver Award. If the manufacturer had included a backplate and a more robust installation system, maybe it would deserve the Golden one.