PCCooler CPS RZ620M X CPU Cooler Review

TweakTown Rating: 89%

Our Verdict

The RZ620M X is a lot of cooler for the money, but settles into a niche market of users who would appreciate what CPS and PCCooler showed us.

Pros

• Cost
• Aesthetics
• Easy-to-use hardware
• Availability
• ARGB and no software

Cons

• Noise level
• Slower maximum CPU speed
• Above-average thermals

Should you buy it?

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Introduction, Specifications, and Pricing

In our time writing about CPU coolers, you get the feeling that you have seen just about everything from every possible manufacturer. Even so, there are times when coolers seem to come out of the woodwork with little fanfare from a maker you may never have considered to meet your needs. While we have met with this manufacturer before, they thoroughly impressed us with their RZ620 and its ability to take top honors in CPU air cooling, against many better-known companies.

While the RZ620 is a lot of things, the major consideration was size, as the dual-tower, twin-fan-cooled assembly ate up real estate. For those with smaller motherboards, smaller cases, taller RAM, etc., the RZ620 quickly gets ruled out. So, what is PCCooler to do? Make a kid brother to the RZ620, with an eye on compatibility, while keeping the styling cues, ease of installation, and widening their audience with the release of this compact contender.

With this newer RZ620M X CPU cooler, you get everything we covered in a mini dual-tower design, hence the 'M' after the 620. The X portion of the name is harder to pinpoint, but maybe it is for eXtra room, or eXcellent compatibility, but anyway you see it, this beefy little cooler has the feel of something serious. History says smaller fan-powered coolers tend not to handle the task, but we will soon see if the CPS / PCCooler RZ620M X BK can take on our 9900X and come out rosy on the other side.

The RZ620M X we have is the black version, but there is also a white option for those wanting a more sterile look. Compatibility is wide, covering mainstream Intel users using LGA115x through LGA1851, with AM4 and AM5 support for AMD customers.

The mini portion of the name comes into play when looking at the dimensions. Front to back, the cooler is 94mm, and side to side it is only 104mm, but the best part is the 118.5mm overall height. Even with its compact size, the RZ620M X sports six 6mm-diameter copper heat pipes to draw heat from the nickel-plate copper base into the two stacks of aluminum fins.

Between the pair of fin stacks is a 100mm fan spinning on ball bearings. The RPM range runs from 1000 at the low end to 3000 at the maximum PWM call. At 3000 RPM, you will get 54.2CCFM, 2.92 mmH2O, and 32.5 dB(A), as shown in the chart. A 4-pin PWM connector powers the fan.

There is another component to mention: the cover, with its small ARGB display, that also takes all the fuss out of fan mounting. The cover is powered via a 4-pin 5VDC connector, while the flip side houses a bracket for mounting the fan, and it all clips into the top of the tower with as little effort as possible.

As with all CPS heat pipe air coolers, you will get three years of coverage against a dead or dying fan or any major damage that the point of sale could not address. More amazingly, in our current economy, there are still sub-$50 solutions to ponder for your next build, and at just $45.99, it's hard not to give the RZ620 M X a fair shake and see what CPS and PCCooler have on offer.

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Packaging

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CPS puts their name on the RZ620M X box, with a play of shiny dark gray and lighter gray triangles, and a bright orange bit to the left. Most of the panel is used to show the cooler, which is also sporting that orange triangle on its cover.

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The right side of the package is essentially a reduced version of what we saw on the front, but this time, only the cooler and its name are shown.

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The change to black for the back makes the white test pop much more than gray would, and we see everything we discussed earlier, minus the ARGB bit. If you want to look online, go to PCCooler.com, and your serial number is at the bottom of the panel.

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The left side of the box goes back to gray, shows the name, and says it is a high-performance cooler, with the other half of the orange triangle on the right this time.

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Inside the cardboard, you will find the cooler and hardware surrounded in dense black foam, ensuring the cooler arrives in prime condition for the customer. The cooler is also wrapped in plastic to protect the paint and finishes, and the literature is in the hardware box.

CPS / PCCooler RZ620M X BK

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Fresh out of the box, the RZ620M X gives the fin stack a checkerboard appeal, and we like the even spread of pipes below and the cap above that covers the pipe tips to dress things up.

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The mini dual-tower design features two stacks of 40 aluminum fins, each with tabs to help with spacing and airflow capture. With a centralized fan for cooling, it leaves another 25mm of clearance at the front of this design that others cannot offer.

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The checkerboard appearance is achieved with a triangular geometric fin stack, where the edges are tallest to support a fan, with the central portion distorted to break up airflow and allow room to build pressure. All fin edges, front and back, are identical to this.

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With evenly spaced fins, tabs with triangles pressed into them, and the side of the fan showing rotation and flow marked with arrows made of triangles, the theme hits in the small details. If you look closely, and room is no concern, you could attach fans to the front and back of this tower, although hardware is not supplied.

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Removing the cover and fan allows us to see the base of the RZ620M X. While the base is two pieces soldered around the heat pipes, it is also grooved to act as a pre-cooler. The screws to mount the cooler to the rest of the hardware can only be accessed with the fan out of the way.

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Considering there are so many pipes in such a small area, the bends are smooth, and spacing leaves the pipes to the sides, where the fan delivers more flow. These six 6mm heat pipes have fins pressed onto them, and we can even make out CPS pressed into the center of each fin.

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Covered with a protective sticker, the base of the RZ620M X is one of the cleaner ones we have seen and is about as close to perfect as one could expect. Machining is done in a circular pattern, leaving the central portion higher to increase pressure on the CPU's heat spreader.

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The other end of the tower is where style was added to dress it up, adding some flair and illumination. The CPS logo sits at the top left of the textured black plastic cover, and in the opposite corner is a triangular section backed with ARGB lighting.

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With little force applied, the top cover unsnaps from the four cup-like clips found near the gap in the middle of the towers. CPS also designs the ARGB lighting to stay with the tower, allowing the cable to run through the central groove cut into the fins, so users don't have to tend to that connector whenever they want to clean the fan.

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The underside of the cover houses a thin steel bracket that uses screws to mount the fan on both sides, using foam pads at the bottom to eliminate vibrations. They also open the bottom of the fan frame, allowing it to go over and around the cooler's mounting hardware, so it sits as low as physically possible in the tower.

Accessories and Documentation

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Those on a mainstream Intel build will want the brackets on the left and the universal backplate with adjustments to fit the supported sockets. With AM4 and AM5 builds, all you need from here are the brackets on the right of the backplate.

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Along with a big tube of EX90 thermal paste, we get the universal standoffs and bracket mounting nuts. The standoffs fit both AMD hardware and the provided Intel backplate, and all knurled nuts use the finer thread on top.

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The manual gives all the images you can handle, with renderings that take you through each mounting variation compatible with the cooler, after a parts list gets things going smoothly. Ending with a wire diagram helps finish the job, and you should be in business in under five minutes, tops.

Installation and Finished Product

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As mentioned previously, the cover and fan need to be out of the way when it's time to mount the tower, as shown by the screwdriver in the gap. As always, alternate a few turns to each until you run out of threads, and simply replace the cover and fan, and plug it in.

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In many of our images, its compact size isn't as apparent as when it hides behind RAM for scale. It is easy to see how the central fan idea solves issues, and we do have a lot more room than we typically get with dual-tower examples.

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Whatever RAM you desire can be used with the RZ620M X, as it leaves all four DIMM slots free. Not only can you have the tallest RAM made, but you can also use all the density you can afford.

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There is something very satisfying about this visual. The RZ620M X resembles a full-cover water block, with its clean, flat, textured appearance that fits perfectly inside the space it is designed to fit into.

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Spinning around to the front and moving in for the view most will get when using the RZ620M X BK in their system. The slick fin design plays with lighting, and the cover is a nice match to the theme of our system.

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Once you add power to the system, the RZ620M X plays its last card, as the triangular cutout erupts into a bright display of color controlled by motherboard sync software, mimicking the motherboard LEDs as closely as possible.

Test System Setup, Thermal Tests, and Noise Results

Chad's CPU Cooler Test System Specifications

To see our testing methodology and to find out what goes into making our charts, please refer to our 2025 CPU Cooler Testing and Methodology article for more information.

Thermal Results

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There are better air-cooled results than 43.6°C as an idle temperature, but we are within a couple of degrees of the best, and, strangely enough, the same as the RZ620.

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Adding stress raised temperatures and noise levels, and, in terms of temperature, we ended up with an average of 76.6°C. Nowhere near the 95°C thermal cap of the CPU, and less than 16 degrees from the best water-cooler temperature seems reasonable for a cooler of this design.

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Our maximum temperature during stress testing was 86°C, which is much closer to the throttle point. We still never saw the CPU running at its base clock, but it had a massive effect on PWM.

CPU Speed

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Our average CPU speed across all cores under stress puts us at the bottom of the chart at 5.174GHz, which is still a fair boost from the 4.4GHz base clock, but we can see nearly 100MHz lost compared to colder options.

VRM Thermal Results

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Considering the CPU being cooled, and the single 100mm fan doing all the cooling, we can't find an issue with the 56°C we saw in the VRM row of the software under stress. You could do better, but why, the RZ620M X did just fine with cooling the power delivery.

Fan Speed and Noise Levels

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Starting at idle, we saw the 100mm fan spinning at 1188 RPM, which is reasonable, since a smaller fan must spin faster to achieve the same effect. Noise isn't really an issue at 32 dB either, but under stress, things completely change. The fans averaged 2430 RPM over the run, and we saw many instances when the fan had to reach 2900 RPM or higher to keep up with what was going on.

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Noise levels could be the deciding factor. The fact that we got to 56 dB under stress is a lot of noise to deal with. While gamers may not mind, this isn't something for an HTPC without major changes to the fan control.

Final Thoughts

First off, we would like to go back to the start, when we unboxed the cooler and first felt the beefiness of the tower, in its weight and general first looks, we were impressed. We noticed right away it was too small for a 120mm fan, but the confusion set in when we realized it wasn't 92mm either. We believe this may be the first CPU cooler with a 100mm fan, but it is the first dual-tower CPU cooler to use a single 100mm fan. CPS and PC cooler honestly took their chart-topping solution, reduced it a fair bit, opted for a single fan and easy-to-use cover, making this space-conscious cooler one of the better thought-out "compact" coolers we have tested.

At the same time, hard facts are what they are, and science has to science, and in that vein, we must get to what we saw in our testing. At first, things seemed normal, impressive even, once we started comparing notes. Idle temperature was good, check. Let's move on. We waited a bit as the noise went from audible to you can hear it down the hall sort of noise, in less time than expected. The RZ620M X spent much of its time more audible than not, and under heavy stress, at 56 dB, you can hear it over the headphones. We know it must happen to get the thermal results we saw, which are decent, but it comes with a huge audible cost.

Using a few tricks and some well-laid-out plans, I think CPS and PCCooler made something for the target they are hunting. Those of you with only a few air-cooled options without going to liquid have your hands tied, and with prices increasing, budgets are a more serious part of a build than ever. That said, the RZ620M X has its place, and it will fit in places many others won't. However, the noise level may be a tough pill to swallow, even with 3 years of support and the low $45.99 price tag. For those with no other options, by all means give it a go, but for those who need silence and have room for larger options, you may want to consider something else.