Long revered for its ability to turn out quality cooling products, be quiet! is launching its newest budget-friendly heatpipe cooler today, the Pure Rock 2. Available in silver ($40/£34) and black ($44/£39), the newest member of the be quiet! arsenal makes use of a single 120mm Pure Wings 2 to move air over this very clean-looking midsize tower cooler.
Specifications
| Height | 6.25" / 158.8mm | |
| Width | 4.75" / 120.1mm | |
| Depth | 2.5" / 63.5mm (3.5" / 88.9mm w/ fan) | |
| Base Height | 1.50" / 38.1mm | |
| Assy. Offset | 0.75" / 19.1mm (centered, w/fan) | |
| Cooling Fans | (1) 120 x 25mm | |
| Connectors | (1) 4-pin PWM | |
| Weight | 20.8 oz / 590g | |
| Intel Sockets | 115x, 2011x*, 2066 (*square ILM mounts only) | |
| AMD Sockets | AM3(+), AM4 | |
| Warranty | 3 years | |
| Web Price | $40 |
Features
The be quiet! Pure Rock 2 hardware list looks rather familiar by providing mounting brackets, backplate and mounting studs supporting Intel and AMD CPUs alike, although mostly focusing on common desktop socket models for each camp. A single fan is included, although an additional pair of wire spring mounting clamps are provided should you wish to add a second fan for a dual-fan, push/pull airflow configuration.
be quiet! covers the Pure Rock 2 with a 3 year warranty.
The base of the Pure Rock 2 features a set of four direct-contact copper heatpipes joined with an aluminum mounting base block. The base shows markings of being milled after final construction and comes blanketed with a generous patch of pre-applied thermal compound. The base block features addition milling of thermal dissipation fins on either side of a cutout central channel, which accepts the torsion retention bar tensioning the cooler to the mounting brackets when installing the cooler.
Milling across the base of the Pure Rock 2 shows incredible uniformity, without convex areas or excessive concavity. A steel straightedge laid across the base of the cooler does not show any visible irregularities across the lateral face of the cooler’s mounting face, which is milled flush with the direct-contact heatpipes.
Uniformity across the base of a cooler means the CPU IHS has the ability to maintain consistent contact with the device designed to dissipate thermal loads. The thermal paste spread of our Arctic MX-4 shows even dispersal and an effective contact patch without excessive pooling or dry spots.
The set of four copper heatpipes extend up the length of the Pure Rock 2 and are capped with a set of polished aluminum caps in a standard, U-shaped design. The cooling fin stack provides a wide airflow channel, with minimal restriction to allow the Pure Wings 2 fan adequate breathing during operation. The sides of the cooling fin stack are left open (rather than closed) to promote lateral venting of airflow through the heatsink rather than maintaining ducted flow through the cooler.
The 120mm Pure Wings 2 fan is managed by a 4pin PWM header and is rated up to 1500 RPM with a life expectancy of 80,000 hours. The fan and cooler are both devoid of dampening materials at the fan mounting points. But as we will see later, this is not an issue.
Installation of the Pure Rock 2 is a straightforward process, requiring minimal effort. The alignment of the central torsion bar to the mounting brackets is engineered in a manner which allows the cooler to sit in the correct orientation and allow the system builder to tension the screws rather easily. Balancing a see-saw has its place on children’s playgrounds, but never when attempting to secure a CPU cooler.
The 120mm Pure Wings 2 fan clips over the side of the Pure Rock 2 cooling fins using dedicated cutouts in the fin stack to lock the spring tabs into place.
Using data collected from multiple cooling evaluations, we can compare the be quiet! Pure Rock 2 with other coolers of similar size and price. All data capture took place using our i7-5930k running at 4.2Ghz @ 1.20v on a MSI X99S XPower AC motherboard, 16GB of Crucial Ballistix DDR-2400 and housed within a Corsair Graphite 760T chassis. Power comes from a 1200watt be quiet! Dark Power Pro.
Note that while our cooling platform is old at this point, the CPU’s 140W TDP, combined with a healthy overclock, still gives today’s coolers a tough workout. That said, we are planning to update our cooling testbed once Intel’s latest CPUs and accompanying motherboards arrive.
Rounding out the testing quartet are a few other coolers we’ve maintained as high-performing mid-size heatpipe cooling solutions: the Cooler Master MasterAir MA410M TUF, Arctic’s Freezer 34 eSPorts DUO and the be quiet! Shadow Rock 3.
Benchmark Results
With all four coolers performing within such close proximity, small differences can begin to make a difference in our charts. The Pure Rock 2 runs slightly warmer than other coolers at 50% PWM provides indication of lower overall fan speed of this cooler with the remainder of our comparison group. This is also indicative of the 100% and 50% motherboard PWM temperature comparisons.
The theory on lower fan speed was correct, which is shown in recorded average fan speeds for each cooler at both 100% and 50% PWM. Interestingly, the Pure Rock 2’s 50% fan speed is very close to its sibling the Shadow Rock 3 at 50% fan speed while 50% thermal load values point to more efficient thermal exchange at lower fan speeds for the Shadow Rock 3 over the Pure Rock 2.
Relative noise levels favor the nearly silent be quiet! Models, which seem to be an indication of more than just a company name for both the Pure Rock 2 and Shadow Rock 3. The Arctic Freezer 34 eSports DUO also shows very low decibel levels at all speeds, while the Cooler Master MA410M TUF spikes above 36 dBA at 100% fan utilization.
Acoustic efficiency provides an indication as to how effective a cooler can do work removing thermal load in addition with its ability to do so quietly (or not quietly). Our test group has a very close grouping of 100% thermal load performance, making the Max Fans value favor those with lower measured decibel values.
Performance value continues to favor the Pure Rock 2 with added measurement of unit pricing by evaluating overall group median cost against individual product price. With the be quiet! Pure Rock 2 priced at $40/£34 (that’s the price for the silver model which we tested), it becomes the lowest-cost option of our comparison group by at least 20%. Combining low unit price with competitive performance attributes produces a very strong performance value chart for the Pure Rock 2.
Thermal imaging from our FLIR ONE Pro camera shows a difference in heat bloom in the central fin stack of the Pure Rock 2 at 50% and 100% fan PWM. There are also indications around the 120mm Pure Wings 2 fan near the top of the cooler (heat rises) at 50% PWM to also indicate the decrease in airflow allows some thermal soaking into the cooling fan via natural, upward convection.
Conclusion
Given its track record in the cooling area, it’s really little surprise that be quiet! would release anything but a high-quality, high-performing cooling product, no matter the focus audience or price point. The Pure Rock 2 represents the same passion around thermal design, silent operation and manufacturing / build quality that has made the company a reputable force of the PC industry. As hardware enthusiasts, we’re often faced with some sort of compromise when decisions must be made around the purchase of specific components, although the Pure Rock 2 keeps those to a minimum.
The company’s pedigree, deeply rooted in performance and quality, are alone enough to draw the gaze of the enthusiasts. But be quiet! delivers on that pedigree at such a pleasing price point with the Pure Rock 2, it's an undeniable recommendation for serious system builders on any budget.
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