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[nextpage title=”Introduction”]

The Zalman LQ315 is a mainstream liquid cooling system for processors. It has a 120 mm radiator with one 120 mm fan. Let’s test it.

Recently, we reviewed the Zalman LQ310, a less expensive version of this cooler. The main visible difference is the depth of the radiator, which is 1.1” (28 mm) thick on the LQ310 and 1.5” (38 mm) on the LQ315. The block is also taller at 1.26” tall (32 mm) versus 1.1” (28 mm) for the simpler model.

Figure 1 shows the box of the Zalman LQ315.

Zalman LQ315Figure 1: Package

Figure 2 shows the contents of the box: the radiator-block set, fan, manual, and installation hardware.

Zalman LQ315Figure 2: Accessories

This water cooler is discussed in detail in the following pages.

[nextpage title=”The Zalman LQ315″]

The sealed radiator-block system is shown in Figure 3. At the left is the block; at the right you can see the radiator. There is a cable on the block with a three-pin connector, which brings power to the integrated pump.

Zalman LQ315Figure 3: Sealed system

Figures 4 and 5 reveal the radiator of the Zalman LQ315.

Zalman LQ315Figure 4: Radiator

Zalman LQ315Figure 5: Radiator

[nextpage title=”The Zalman LQ315 (Cont’d)”]

Figure 6 shows the top of the block, where the pump that makes the liquid flow is integrated. The clear area around the “Z” is illuminated in blue, thanks to an internal LED.

Zalman LQ315Figure 6: Block

The base of the block, which is made of copper, is revealed in Figure 7. The thermal compound comes pre-applied.

Zalman LQ315Figure 7: Base

Figure 8 illustrates the 120 mm fan that comes with the Zalman LQ315. The fan has a four-pin connector, which means it is compatible with PWM speed control.

Zalman LQ315Figure 8: Fan

[nextpage title=”Installation”]

In Figures 9 and 10, you can see the backplate of the Zalman LQ315 for Intel CPUs with the nuts mounted in the position for sockets LGA1155 and LGA1156, and the frame mounted with screws in place. The cooler also comes with similar parts for installation on AMD systems.

Zalman LQ315Figure 9: Backplate

Zalman LQ315Figure 10: Frame with screws

Figure 11 shows the frame installed on the block.

Zalman LQ315Figure 11: Frame installed

In Figure 12, you can see the LQ315 installed in our case. The product manual instructs the user to install the fan blowing air into the radiator, so we had to install it at the top panel of our case because the radiator didn’t fit the rear panel of our case.

Zalman LQ315Figure 12: Installation finished

[nextpage title=”How We Tested”]

We tested the cooler with a Core i5-2500K CPU (quad-core, 3.3 GHz), which is a socket LGA1155 processor with a 95 W TDP (Thermal Design Power). In order to get higher thermal dissipation, we overclocked it to 4.0 GHz (100 MHz base clock and x40 multiplier), with 1.3 V core voltage (Vcore). This CPU was able to reach 4.8 GHz with its default core voltage, but at this setting, the processor enters thermal throttling when using mainstream coolers, reducing the clock and thus the thermal dissipation. This could interfere with the temperature readings, so we chose to maintain a moderate overclocking.

We measured noise and temperature with the CPU under full load. In order to get 100% CPU usage in all cores, we ran Prime 95 25.11 with the “In-place Large FFTs” option. (In this version, the software uses all available threads.)

We compared the tested cooler to other coolers we already tested, and to the stock cooler that comes with the Core i5-2500K CPU. Note that the results cannot be compared to measures taken on a different hardware configuration, so we retested some “old” coolers with this new methodology. This means you can find different values in older reviews than the values you will read on the next page. Every cooler was tested with the thermal compound that comes with it.

Room temperature measurements were taken with a digital thermometer. The core temperature was read with the SpeedFan program (available from the CPU thermal sensors), using an arithmetic average of the core temperature readings.

During the tests, the panels of the computer case were closed. The front and rear case fans were spinning at minimum speed in order to simulate the “normal” cooler use on a well-ventilated case. We assume that is the common setup used by a cooling enthusiast or overclocker.

The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed near the top opening of the case. This measurement is only for comparison purposes, because a precise SPL measurement needs to be made inside an acoustically insulated room with no other noise sources, which is not the case here.

Hardware Configuration

Operating System Configuration

  • Windows 7 Home Premium 64 bit SP1

Software Used

Error Margin

We adopted a 2°C error margin, meaning temperature differences below 2°C are considered irrelevant.

[nextpage title=”Our Tests”]

The table below presents the results of our measurements. We repeated the same test on all coolers listed below. Each measurement was taken with the CPU at full load. In the models with a fan supporting PWM, the motherboard controlled the fan speed according to core load and temperature. On coolers with an integrated fan controller, the fan was set at the full speed.

Cooler Room Temp. Noise Speed Core Temp. Temp. Diff.
Cooler Master Hyper TX3 18 °C 50 dBA 2850 rpm 69 ºC 51 °C
Corsair A70 23 °C 51 dBA 2000 rpm 66 ºC 43 °C
Corsair H100 26 °C 62 dBA 2000 rpm 64 ºC 38 °C
EVGA Superclock 26 °C 57 dBA 2550 rpm 67 ºC 41 °C
NZXT HAVIK 140 20 °C 46 dBA 1250 rpm 65 ºC 45 °C
Thermalright True Spirit 120 26 °C 42 dBA 1500 rpm 82 °C 56 °C
Zalman CNPS12X 26 °C 43 dBA 1200 rpm 71 °C 45 °C
Zalman CNPS9900 Max 20 °C 51 dBA 1700 rpm 62 °C 42 °C
Titan Fenrir Siberia Edition 22 °C 50 dBA 2400 rpm 65 °C 43 °C
SilenX EFZ-120HA5 18 °C 44 dBA 1500 rpm 70 °C 52 °C
Noctua NH-L12 20 °C 44 dBA 1450 rpm 70 °C 50 °C
Zalman CNPS8900 Extreme 21 °C 53 dBA 2550 rpm 71 °C 50 °C
Gamer Storm Assassin 15 °C 48 dBA 1450 rpm 58 °C 43 °C
Deepcool Gammaxx 400 15 °C 44 dBA 1500 rpm 60 °C 45 °C
Cooler Master TPC 812 23 °C 51 dBA 2350 rpm 66 °C 43 °C
Deepcool Gammaxx 300 18 °C 43 dBA 1650 rpm 74 °C 56 °C
Intel stock cooler 18 °C 41 dBA 2000 rpm 97 °C 79 °C
Xigmatek Praeton 19 °C 52 dBA 2900 rpm 83 °C 64 °C
Noctua NH-U12P SE2 18 °C 42 dBA 1300 rpm 69 °C 51 °C
Deepcool Frostwin 24 °C 46 dBA 1650 rpm 78 °C 54 °C
Thermaltake Frio Advanced 13 °C 56 dBA 2000 rpm 62 °C 49 °C
Xigmatek Dark Knight Night Hawk Edition 9 °C 48 dBA 2100 rpm 53 °C 44 °C
Thermaltake Frio Extreme 21 °C 53 dBA 1750 rpm 59 °C 38 °C
Noctua NH-U9B SE2 12 °C 44 dBA 1700 rpm 64 °C 52 °C
Thermaltake WATER2.0 Pro 15 °C 54 dBA 2000 rpm 52 °C 37 °C
Deepcool Fiend Shark 18 °C 45 dBA 1500 rpm 74 °C 56 °C
Arctic Freezer i30 13 °C 42 dBA 1350 rpm 63 °C 50 °C
Spire TME III 8 °C 46 dBA 1700 rpm 70 °C 62 °C
Thermaltake WATER2.0 Performer 11 °C 54 dBA 2000 rpm 49 °C 38 °C
Arctic Alpine 11 PLUS 11 °C 45 dBA 2000 rpm 82 °C 71 °C
be quiet! Dark Rock 2 10 °C 41 dBA 1300 rpm 58 °C 48 °C
Phanteks PH-TC14CS 16 °C 47 dBA 1300 rpm 58 °C 42 °C
Phanteks PH-TC14PE 16 °C 48 dBA 1300 rpm 57 °C 41 °C
SilverStone HE01 (Q) 19 °C 44 dBA 1150 rpm 63 °C 44 °C
SilverStone HE01 (P) 20 °C 57 dBA 2050 rpm 62 °C 42 °C
Thermaltake WATER2.0 Extreme (S) 17 °C 44 dBA 1250 rpm 52 °C 35 °C
Thermaltake WATER2.0 Extreme (E) 17 °C 53 dBA 1900 rpm 50 °C 33 °C
Deepcool Neptwin 11 °C 46 dBA 1500 rpm 56 °C 45 °C
SilverStone HE02 19 °C 49 dBA 2000 rpm 64 °C 45 °C
Zalman CNPS9900DF 23 °C 45 dBA 1400 rpm 68 °C 45 °C
Deepcool ICE BLADE PRO V2.0 22 °C 43 dBA 1500 rpm 67 °C 45 °C
Phanteks PH-TC90LS 24 °C 47 dBA 2600 rpm 95 °C 71 °C
Rosewill AIOLOS 20 °C 40 dBA 1600 rpm 94 °C 74 °C
Corsair H60 20 °C 49 dBA 2000 rpm 64 °C 44 °C
Zalman LQ310 27 °C 51 dBA 2050 rpm 65 °C 38 °C
Noctua NH-L9i 24 °C 44 dBA 2500 rpm 95 °C 71 °C
NZXT Respire T40 20 °C 45 dBA 1850 rpm 76 °C 56 °C
NZXT Respire T20 21 °C 45 dBA 1900 rpm 77 °C 56 °C
Zalman LQ315 20 °C 52 dBA 1950 rpm 57 °C 37 °C

In the graph below, you can see how many degrees Celsius hotter the CPU core is than the air outside the case. The lower this difference, the better is the performance of the cooler.

Zalman LQ315

In the graph below, you can see how many decibels of noise each cooler makes.

Zalman LQ315

[nextpage title=”Main Specifications”]

The main specifications for the Zalman LQ315 CPU cooler include:

  • Application: Sockets LGA1155, LGA1156, LGA1366, LGA2011, AM2, AM2+, AM3, AM3+, and FM1
  • Radiator dimensions: 6.0 x 4.7 x 1.5 inches (153 x 120 x 38 mm) (W x L x H)
  • Block height: 1.26 inch (32 mm)
  • Fins: Aluminum
  • Base: Copper
  • Heat-pipes: None
  • Fan: 120 mm
  • Nominal fan speed: 2,000 rpm
  • Fan air flow: NA
  • Power consumption: 2.4 W
  • Nominal noise level: NA
  • Weight: 1.27 Lbs (575 g)
  • More information: https://www.zalman.com
  • Average Price in the U.S.*: USD 100.00

* Researched at Newegg.com on the day we published this review.

[nextpage title=”Conclusions”]

When we reviewed the Zalman LQ310, we wrote that it was an excellent liquid cooling system, with low price and excellent cost/benefit ratio. The Zalman LQ315 performed a little better than the simpler version, also with acceptable noise level, and easy installation. The blue LED embedded in the block is a plus for case modders.

The problem with the LQ315 is that it costs about 50% more than the LQ310, so it doesn’t share the excellent cost/benefit ratio.

By being a very good sealed liquid cooling system, the Zalman LQ315 receives the Hardware Secrets Silver Award.