DeepCool LT720 – Solid cooler with a gorgeous block

Key Features

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Key features of the cooler

The LT720 fits perfectly into DeepCool’s current visual concept, which is characterized by its emphasis on modern design with sharply cut edges. The entire exterior of the cooler is sharply cut and clean with simple geometry. The pump cover stands out the most, of course, resembling a clear crystal emerging from the metal, but the cover material itself is of course plastic. Underneath the transparent part of the cover hides a 5V ARGB LED strip, which provides an impressive spectacle in the form of a combination of geometric shapes and an infinity mirror effect. The manufacturer refers to the effect as a “three-dimensional infinity mirror” and takes inspiration from the work of Piet Mondrian, whose work is characterised by a combination of simple shapes and primary colours.

This designer cover hides a pump underneath, to which it is attached by four magnets. The cooler uses a fourth generation pump developed directly by DeepCool engineers. This is not a generic Asetek design, as can be seen in the shape and size of the cooling block’s coldplate. A layer of thermal paste is also applied to this area from the factory to make installation as easy as possible.

   

A cable comes out of the pump which provides power and a speed monitoring signal. Unfortunately, the pump cannot be regulated using pulse width modulation (PWM) signals, but regulation using linear voltage (DC) works well. Swivel fittings on the block provide for easier routing of tubing that carries liquid to and from the radiator, and the tubes are nylon braided for durability and a more attractive appearance. A useful detail is the two plastic clips on the tubes for a neater appearance of the cooler in the build. I would appreciate if more cooler manufacturers took inspiration from this solution. Another interesting feature is the implementation of “Anti-Leak Tech” in this cooler. The name may be a bit of an exaggeration. It does not mean that this cooler can never leak liquid. However, there is a small expansion membrane integrated in the circuit to compensate for pressure fluctuations in the circuit due to temperature changes during cooler operation, resulting in a reduced risk of liquid leakage due to excessive liquid pressure.

   

The contents of the cooler package are pretty standard. In the accessories you will find all the necessary parts to install the cooler on the processor, where you just need to choose the right set of parts according to the socket. There are also a dozen 5mm screws to attach the radiator to the computer case and a cable splitter to connect all three fans to a single header on the motherboard. As I mentioned in the previous text, you will find a layer of thermal paste applied to the base of the cooler from the factory. Unfortunately, however, a tube of replacement paste is missing from the supplied accessories. I always criticize this step, because it is a completely unnecessary saving in the wrong place.

   

As usual, when installing the cooler on AMD processors, you use the motherboard’s native backplate. For Intel processors you use the supplied backplate with adjustable screw spacing according to the socket – LGA 1700 has a slightly wider hole spacing in the board compared to LGA 1200/115x. The installation of the cooler itself could be a bit easier, but it is still not complicated. Everything is detailed in the clear user manual. DeepCool also recommends that for optimal cooler effectiveness, the pump block should be installed with the fittings and tubing extending out of the block towards the bottom of the case. The orientation of the manufacturer’s logo on the pump cover serves as an aid.

Pump, radiator and fan parameters

DeepCool LT720 does not stand out from its class of coolers except for a slightly longer radiator than other manufacturers use. The length of the radiator is slightly over 400 mm, which needs to be taken into account in terms of compatibility with the computer case. The LT720 is priced very reasonably and will certainly put pressure on the competition. A nice bonus is also the support for AMD Threadripper processors, which is not quite common with all coolers. I’m just a little worried that the contact area of the cooler won’t sufficiently cover the entire heat spreader of high-end AMD processors.

The supplied FK120 fans are also used by DeepCool for its AK series air coolers. On paper they look impressive, but unfortunately these specifications are not comparable between manufacturers and without a unified methodology they don’t have much relevance. I list them here more for reference and partly out of some inertia.





The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Measurement methodology

As a test processor and heat generator, I am now using an Intel Core i7-11700K on the Asus TUF Gaming Z590-Plus WiFi motherboard. The entire build is mounted on a Streacom BC1 frame with no fans to provide airflow. Acoustic shielding (acoustic foam on OSB boards) is installed around the test setup to eliminate ambient noise.

   

The Voltcraft SL-100 calibrated noise meter is placed perpendicular to the cooler in a fixed position relative to the motherboard at a distance of approximately 35 cm from the processor socket. Stress tests are performed using Prime95 with a duration of 30–35 minutes. The coolers are tested at three standardized noise levels (36, 39 and 42 dBA) and finally at maximum speed. The tests are run in two sets according to the heat output of the processor.

The first set of tests is at 125 W, the PL1 processor’s enforced limit. The second set of power draw is then about 205–210 W (4500 MHz at 1.285 V). However, this second level represents a very high concentration of heat per mm² due to the small size of the chip itself. Thus, not all coolers can be expected to pass this set of tests at all noise levels. At the end of the test, the highest temperature achieved is always recorded.

All data regarding CPU temperatures and heat output are obtained from the HWiNFO64 application. The measured values are then corrected against the room temperature as the resulting Delta T value. Any higher value means a processor temperature over 95–100 °C and a risk of thermal throttling. Therefore, if the cooler does not pass the load with a Delta T value below 75 °C, such a test is marked as a failure.

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Results – 36 dBA

Once again, I was unable to get results at the 36 dBA level, and I’m starting to get the impression that this is a virtually unattainable baseline for AIO coolers. In fact, the pump is always noisier than fans running at minimum speed. The lowest measured noise level of the DeepCool LT720 cooler was 38.9 dBA with the pump speed reduced at 7V. At full pump power it was slightly above 40 dBA. However, the differences in cooler effectiveness were minimal, so I left the pump on 7V during the tests.

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Results – 39 dBA

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Results – 42 dBA

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Results – 45, 48 and 51 dBA

I have also tested the DeepCool LT720 at noise levels of 45, 48 and 51 dBA and am starting to get a nice data set for AIO coolers at these levels. Hopefully I will be able to include these charts soon to better compare the AIO coolers to each other.

The relationship between temperature and noise is virtually linear for the DeepCool LT720. The optimum efficiency ratio at acceptable noise levels is around 50 to 60% max fan speed and with the pump at 7-9V.

The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Results – maximum speed

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The LT720 cooler is the top of the range from DeepCool. It is a classic 360mm liquid all-in-one cooler that should offer an interesting price/performance ratio. At first glance, it will catch your eye with its visual design that combines simple geometry and a mirror effect with RGB backlighting. Above all, however, coolers should perform well without being too noisy. So let’s see how well the LT720 does in our tests.

Conclusion and evaluation

DeepCool LT720 is another great cooler on the market, which can impress not only with its high effectiveness, but also with its interesting price-performance ratio. Moreover, it clearly stands out from the crowd with its interesting design that combines a 3D infinity mirror effect, a simple geometric pattern and dynamic RGB backlighting. It would fit perfectly into a cyberpunk-themed build, for example.

I was a bit disappointed by the absence of a tube of thermal paste in the package. DeepCool could also work on eliminating the vibration of the FK120 fans at certain speed levels (about 65% and 90% of max speed), which led to resonance with the radiator and an annoying buzzing of the cooler. These minor flaws unnecessarily spoil the overall good impression I had of this cooler. However, if you are looking for a visually really interesting cooler for your build, the DeepCool LT720 will serve you perfectly. And of course, it will also easily tame your CPU temperatures without making too big a dent in your budget. The Approved editorial award is well deserved.

English translation and edit by Jozef Dudáš

• Contents
• Key Features
• Measurement methodology
• Results – 36 dBA
• Results – 39 dBA
• Results – 42 dBA
• Results – 45; 48 and 51 dBA
• Results – maximum speed
• Conclusion and evaluation