Unboxing and review of DEEPCOOL LT720’s 3D infinite reflection integrated water cooling system with a five-year leak guarantee

The DEEPCOOL LT720, a 360mm integrated water cooler, boasts a fourth-generation high-performance water pump developed in-house. It’s paired with an FK120 fan that features FDB bearings, delivering a top speed of 2250 RPM and an impressive air pressure of 3.27 mmAq. A standout feature is the multi-dimensional infinity mirror atop the water-cooling head, which has a magnetic attachment, making it effortless to disassemble and reassemble. Plus, it supports synchronized lighting effects compatible with five major lighting control software solutions.

Specifications of the DEEPCOOL LT720 water cooler include:

  • Supported Intel sockets: LGA 2066/2011-v3/2011/1700/1200/1151/1150/1155
  • Supported AMD sockets: sTRX4/sTR4/AM5/AM4
  • Water pump speed: Approximately 3100 RPM
  • Water block size: 94 x 80 x 68 mm with a copper contact surface
  • Radiator dimensions: 402 x 120 x 27 mm
  • Fan measurements: 120 x 120 x 25 mm with a speed range of roughly 500 to 2250 RPM
  • Peak airflow: 85.85 CFM and top air pressure: 3.27 mmAq
  • Power connections: 3-Pin for the water-cooling head and PWM 4-Pin for the fan
  • Comes with a five-year warranty against leaks.

DEEPCOOL Jiuzhou Fengshen LT720 all-in-one water cooling unboxing

China’s DEEPCOOL, known under the representation of “Shibotong”, has consistently introduced a variety of acclaimed air and water cooling systems in recent times. Notable examples include the ASSASSIN IV air-cooled tower fan. Today, we’re diving into the unboxing of their LT integrated water cooling series.

The LT lineup offers two sizes for consumers: the 360mm LT720 and the 240mm LT520. Particularly, the LT720 comes with a commendable 5-year leak-proof warranty. It utilizes DEEPCOOL’s proprietary fourth-generation water pump, achieving speeds up to 3100 RPM. Furthermore, its mounting system is compatible with both Intel and AMD processor pins.

DEEPCOOL Jiuzhou Fengshen LT720.
Paper specifications are printed on the back of the box.

The DEEPCOOL LT720 comes in two color variations: black and white. When making a purchase, you can distinguish between the two by their model numbers: “LT720/Black” for the black version and “LT720 WH/White” for the white one. For this unboxing, I have the black variant of the DEEPCOOL LT720. Both the water-cooling tube and the radiator sport an all-black design, with the only exception being the gray hue on the water block. This particular water block is compatible with a range of platforms including Intel’s LGA 2066/2011-v3/2011/1700/1200/1151/1150/1155 and AMD’s sTRX4/sTR4/AM5/AM4.

Relevant dimensions and specifications of water-cooling head and water-cooling radiator.

The water-cooling head of the DEEPCOOL LT720 showcases a multi-dimensional, three-dimensional infinity mirror design, measuring 94 x 80 x 68 mm. Its design inspiration is drawn from Mondrian’s “New Plasticism_Geometric School”, featuring a square as the primary shell body with the inner infinity mirror extending beyond it. The water-cooling head and its outer shell can be detached independently, making the installation process easier. What’s more, the shell attaches magnetically to the water-cooling head, ensuring a hassle-free assembly and disassembly process.

The exterior shell is embedded with multiple LED lamp beads. These can be connected to the motherboard using a pair of 5V 3-Pin ARGB cables, one male and one female. Alternatively, other ARGB devices can be linked in sequence to achieve synchronized lighting effects. Additionally, the LT720 is compatible with lighting control software from five major brands: MSI, ASRock, GIGABYTE, ASUS, and Razer. Users can utilize any of these platforms to customize the lighting patterns and effects on the water-cooling head.

Magnetic fixed water cooling head cover.
Triple mirror cover.
Magnetic fixation.
The outer cover provides one male and one female 5V 3-Pin ARGB to synchronize lighting effects with other devices.

The LT720 proudly incorporates DEEPCOOL’s proprietary fourth-generation water pump. With its internal 3-phase, 6-pole inner-wound motor design, this pump can achieve peak speeds up to 3100RPM. Simultaneously, DEEPCOOL has enhanced the micro-water channel configuration and augmented the copper base’s thickness. These modifications not only improve the water cooling head’s structural design but also boost its thermal conductivity capabilities.

Side view of the water block.
The large-sized copper bottom contact surface is pre-coated with thermal paste.
Water cooling is powered by 3-Pin.
Water cooling explosion diagram.

The DEEPCOOL LT720 water-cooling radiator measures 402 x 120 x 27 mm, adhering to the standard 27 mm thickness often seen in integrated water cooling systems. Its single-wave aluminum cooling fins are accentuated with black paint. Notably, on the side of the radiator, there’s a dynamic balance pressure relief valve. DEEPCOOL has innovatively incorporated a pressure relief bag inside the LT720’s radiator, regulating internal pressure by adjusting the coolant volume based on pressure disparities. If the internal pressure within the radiator becomes excessive, this relief valve lets out some air, ensuring equilibrium. This mechanism not only maintains optimal performance but also prolongs the radiator’s lifespan.

The water-cooling tube length is 410 mm.
Water-cooling pipe fixing clip.
The single wave water cooling radiator size is 402 x 120 x 27 mm.
Dynamic balancing pressure relief valve.

The DEEPCOOL LT720 comes with three FK120 high-performance fans right out of the box. Each FK120 fan employs a Fluid Dynamic Bearing (often abbreviated as FDB) and operates within a rotational speed range of 500 to 2250 RPM, with a margin of ±10%. These fans boast a maximum airflow and air pressure of 85.85 CFM and 3.27 mmAq, respectively.

Interestingly, the FK120 fan doesn’t feature RGB lighting. It’s powered via a 4-Pin PWM connection and fully supports PWM temperature control for adjusting the fan speed curve. Users can tailor the fan’s speed according to real-time temperature data, achieving a perfect harmony between minimal noise and optimum performance. Even at its highest speed, the FK120 maintains a relatively quiet operation, with its noise level capped at a mere 32.9 dB(A), as per the company’s claims.

Matte FK120 fan, fan dimensions 120 × 120 × 25 mm.
There are shock-absorbing pads on both sides and four corners of the fan.
The fan is powered by PWM 4-Pin.

The DEEPCOOL LT720 also comes with several supplementary accessories. These comprise an all-black buckle set, three sets of both long and short fan screws, three fan deceleration cables, a PWM splitter cable, and a reinforced backplane for Intel.

For users seeking the quietest operation, the fan deceleration cables offer an optimal solution. By connecting the three FK120 fans to the PWM power source using these cables, the fan’s operational range is capped at 500 to 1600 RPM with a variance of ±10%. Consequently, this restriction results in a reduction of airflow and pressure, dropping to 60.85 CFM and 1.65 mmAq respectively. Furthermore, at full speed, the noise output is also minimized, registering at a serene ≤28.2 dB(A).

Intel buckle set, AMD buckle set, fan screw set, fan reduction cable, breakout cable, Intel reinforced backplane.
Three fan deceleration wires.
PWM is divided into three wires.

DEEPCOOL LT720 integrated water cooling heat dissipation performance test

For this particular setup, the DEEPCOOL LT720 all-in-one water cooler was paired with the Intel Core i7 13700 processor on the BIOSTAR Z790 VALKYRIE motherboard. The test environment was a room maintained at 26°C with air-conditioning. To ensure an exhaustive test, the water cooler’s PUMP and fan were set to run at full speed through the motherboard BIOS. The tools used for testing included AIDA64 FPU and R23 for multi-core evaluations, simulating peak-load temperature data. The 3DMark Fire Strike test was also employed to mimic in-game operational conditions. HWiNFO64 was the software of choice for data collection, specifically capturing the highest CPU package temperature.

Test Platform Specifications:

  • Processor: Intel Core i7 13700
  • Cooling Solution: DEEPCOOL LT720
  • Motherboard: BIOSTAR Z790 VALKYRIE (BIOS version: Z79AC510)
  • RAM: T-Force DELTA RGB DDR5 6200 MT/s 16GBx2
  • Graphics Card: NVIDIA GeForce RTX 4070 Founders Edition
  • Operating System: Windows 11 Professional Edition 21H2
  • Power Supply: FSP Hydro G PRO ATX3.0 (PCIe5.0) 850W

Test Results:

  1. In standard use scenarios, such as the AIDA64 CPU and the 3DMark Fire Strike game simulation test, the i7 13700 when cooled with the DEEPCOOL LT720 reached peak temperatures of 69°C and 71°C, respectively. This showcases the LT720’s commendable cooling efficiency for typical gaming and daily computing tasks with an Intel i7-grade processor.
  2. In more intensive tests, like the AIDA64 FPU (which simulates high computational loads) and the CINEBENCH R23 multi-core processor rendering simulation, the CPU package hit maximum temperatures of 97°C and 92°C, respectively. These figures demonstrate that, even under substantial processor strain, the 180W 13700 is maintained below 100°C by the DEEPCOOL LT720. However, it’s worth noting that most real-world scenarios won’t push the processor to such extremities.
Infinite reflective block water block.
Thermal performance test chart.


The DEEPCOOL’s LT720 integrated water cooling system, from Jiuzhou Fengshen, exhibits meticulous attention to product details. One notable feature is the incorporation of magnetic suction in the latch hole of the cooling head, which facilitates users in installing smaller cold head clasps securely. This method is more user-friendly than traditional screws. The magnetic suction-enabled cover of the cooling head is easy to disassemble and reassemble. If one needs to modify the orientation of the cooling pipe during setup, it’s simple: just remove the outer cover, adjust it, and then reposition it.

Regarding thermal performance, I put the LT720 to the test with the i7 13700 processor on an open-air setup. The results? It managed to maintain temperatures around 71°C during gaming and typical usage. For tasks like rendering or intensive computations that place higher demands on the CPU, I feel the LT720 shows its prowess even more. It’s ideally paired with CPUs that have power requirements in the 180~200 W range. Priced at NT$3,990, the LT720 provides excellent value. If you’re scouting for a high-performing water block around the NT$4,000 mark, the LT720 is worth a glance.

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Title: Unboxing and review of DEEPCOOL LT720’s 3D infinite reflection integrated water cooling system with a five-year leak guarantee