GAMEMAX Sigma 620 WH review: Air cooler with LCD screen and strong cooling
GAMEMAX SIGMA 620 WH is designed for users who want both strong cooling and a unique visual touch in their PC build. For a long time, I have personally preferred air cooling because it is simple, reliable, and requires very little maintenance. But in recent years, many liquid coolers have become more attractive because they include small displays that show system information or custom images. Now, GAMEMAX has brought this idea to air cooling with the SIGMA 620 WH, which makes it stand out from many traditional tower coolers.
What makes this cooler interesting is the 2.8-inch customizable LCD screen placed on the top. It can show real-time system information or even display custom images and videos, which adds personality to the setup. At the same time, it still focuses on strong cooling performance with six 6 mm heatpipes, dual 120 mm fans, and support for CPUs up to 245W TDP. This combination allows it to handle powerful processors while also improving the overall look of the PC build.
Unboxing
The SIGMA 620 comes in a clean white box with a simple design. On the front, there is a large image of the cooler. It shows the single tower heatsink, white fans, and the LCD screen on top. The GAMEMAX logo is on the left, while the product name SIGMA 620 is printed on the right. A few icons at the bottom highlight features like PWM support, LCD display, ARGB lighting, and 245W TDP support.
The back of the box shows the main features of the cooler. It explains the 2.8-inch customizable LCD screen, dual-fan single-tower design, and six heatpipes. Small images also show the cooler and its parts.
One side of the box lists the full specifications, including dimensions, fan speed, airflow, noise level, and CPU compatibility. The other side is simple and shows product information in multiple languages along with the official website.
After opening the box, the first thing you see is the user guide placed on top. Under it, the cooler and accessories are packed safely inside a thick foam container. The mounting accessories are stored in a separate small box.
Inside the installation kit, GAMEMAX provides all the required mounting parts for both Intel and AMD platforms.
Inside the box, the following parts are included:
- Radiator (tower heatsink)
- Forward fan 120mm (A12-B)
- Reverse fan 120mm (A12-A)
- Universal mounting bracket
- Intel backplate (LGA1851 / LGA1700)
- Intel spacers (LGA1851 / LGA1700) ×4
- AMD spacers (AM4 / AM5) ×4
- Intel screws ×4
- AMD screws ×4
- Buckle strips / fan clips ×4
- Thermal paste ×1
- Small scraper ×1
Overall, the accessories are well organised and provide everything needed for installation.
GAMEMAX Sigma 620 specifications
| Specification | Details |
|---|---|
| Model | SIGMA 620 WH |
| Cooler Type | Single Tower Air Cooler |
| Dimensions | 120 × 114.2 × 158.8 mm |
| TDP Support | Up to 245W |
| Heatsink Material | Aluminium Fins |
| Number of Fins | 48 |
| Heatpipes | 6 × 6mm Heatpipes |
| Heat Base | Soldered Copper Base |
| Display | 2.8-inch LCD Screen |
| Fan Size | 120 × 120 × 25 mm |
| Fan Quantity | 2 Fans |
| Fan Type | Positive Blade + Reverse Blade |
| Bearing Type | Rifle Bearing |
| Fan Speed | 800 – 1800 RPM ±10% |
| Lighting | ARGB (Motherboard Sync Supported) |
| Connector | 4-pin PWM, 3-pin ARGB |
| CPU Compatibility | Intel LGA1851 / 1700 / 1200 / 115X |
| AMD AM5 / AM4 |
A closer look
Heatsink
The Sigma 620 uses a single tower heatsink design. The cooler measures 120 × 114.2 × 158.8 mm and has a net weight of 154 g. It is available in black and white, and our review unit comes in white. The whole heatsink, including the heatpipes, is finished in full white, which gives it a very clean look.
The heatsink includes 48 aluminium fins. At the center, it uses 6 superconducting composite heatpipes, each with a 6 mm diameter. These heatpipes run through the tower and connect to the base. The sides of the heatsink fins use a raised design, which allows the fan clips to fit securely into the fins for mounting the fans.
The cooler also includes an anti-insect intrusion design. The bottom panel uses an extended design that helps seal the hardware rack holes.
On the top cover, there is a 2.8-inch LCD monitor. This screen sits neatly on the top of the heatsink and adds a modern touch to the cooler.
Fans
The cooler includes two 120 mm fans, each measuring 120 × 120 × 25 mm. The main fan uses a regular blade design, while the secondary fan uses a reverse blade design.
Both fans use rifle bearings. The fan frame colour is white, and each fan has 9 blades. Each fan also includes 28 ARGB LEDs.
Both fans run at 12 V rated voltage with a 5 V start-up voltage. The rated current is 0.22 A for the main fan and 0.2 A for the secondary fan. The rated power is 2.64 W and 2.4 W.
The fan speed ranges from 800 to 1800 RPM ±10%. Maximum airflow is 71.66 CFM for the main fan and 70.71 CFM for the secondary fan. Maximum static pressure is 2.54 mmH₂O and 2.1 mmH₂O. The maximum noise level is 35.5 dBA and 42 dBA.
Both fans have a rated life of 30,000 hours. The connector includes 3-pin AURA ARGB and 4-pin PWM. Each fan also has soft rubber pads on the corners to reduce vibration. A thin ARGB light strip runs along the side of the fan frame, which remains visible and glows in a style similar to infinity fans.
Installation
The installation process of the Sigma 620 is simple and easy to follow. The steps are clearly explained in the user guide, so even new users can install it without confusion. One good thing is that the heatsink can be installed without attaching the fans first, which makes handling and mounting much easier.
The mounting system feels secure once installed, and the cooler sits firmly on the CPU. The included brackets and accessories make the process smooth for both Intel and AMD platforms.
Clearance
When it comes to RAM clearance, the space is quite tight. As seen in the images, the cooler sits very close to the RAM slots, leaving limited room on that side. If you are using RAM with tall heatsinks, you may face compatibility issues. Low-profile RAM would be a better fit in this case.
On the other hand, the clearance on the opposite side is much better. There is enough space around the motherboard area, so it does not cause any issues with other components. You can raise the fan position slightly to get more RAM clearance. However, this comes with a small trade-off, as the fan may cover the RGB lighting, which affects the overall look. Overall, the installation is easy, but the RAM height should be considered before installing this cooler.
Software
The software for the Sigma 620 is very basic, but it gets the job done. The interface is simple and easy to understand, so you don’t need much time to get used to it.
Most of the software is focused on CPU temperature monitoring and screen themes. You can view real-time system data like CPU usage, temperature, and other basic stats directly on the LCD screen.
There are a few pre-built themes available, which you can apply easily. These include system info layouts and simple visual designs. You can also adjust settings like brightness and screen rotation.
One useful feature is that you can create your own custom theme. You can add your own images or simple layouts to personalise the display according to your setup.
Here are a few examples of themes displayed on the Sigma 620 cooler screen.
Testing and thermal performance
We tested the GAMEMAX SIGMA 620 in the GAMEMAX Leader 2 case using an Intel Core i7-12700K with the MSI MPG Z790 CARBON MAX WIFI II motherboard. The room temperature during testing was 28°C. At idle, the CPU stayed around 39°C with low fan speed. The fans remained quiet, and noise was barely noticeable.
Under load, we ran a CPU-Z stress test. The CPU reached around 185W, and temperatures went up to 72°C. The cooler handled this load well. Fan speed increased smoothly, and noise stayed at a comfortable level. There was no thermal throttling, and the system remained stable. For a heavier test, we used the AIDA64 single FPU stress test. In this test, the CPU again stayed in the 180–190W range, and temperatures reached 85°C. This is on the higher side but still within safe limits. The cooler maintained stable performance without any issues.
Overall, the Sigma 620 performs well for a high-performance air cooler. It handles heavy loads without stability problems. The claimed 245W TDP support also seems reasonable based on these results, as it can manage around 190W+ comfortably.
Final thoughts
The GAMEMAX SIGMA 620 WH offers a good balance between performance and design. It stands out by adding a customizable LCD screen, which is not common in air coolers. This gives it a unique touch while still keeping the reliability of traditional air cooling.
The build quality is clean and consistent. The full white finish, including the heatsink and heatpipes, looks neat inside the case. The ARGB lighting and top display add extra visual appeal without feeling too much. In terms of performance, the cooler handled the i7-12700K well. It managed around 190–200W loads while keeping temperatures in a safe range. Fan noise is also controlled, staying quiet at idle and reasonable under load.
The software is simple and basic, but it works fine. It mainly focuses on CPU temperature monitoring and screen themes. You can choose from a few built-in themes or even create your own custom theme, which adds a bit of personalisation.
There are a few things to consider. RAM clearance is tight, especially with taller memory modules. You can adjust the fan position for more space, but it may cover the RGB lighting. The GAMEMAX Sigma 620 WH delivers stable performance and adds a unique feature with its LCD screen. Based on its overall performance and usability, I would give it the EnosTech Performance Award.
