Xigmatek Loki CPU Cooler Review
By Rafael Otto Coelho on October 17, 2011


Introduction

Hardware Secrets Bronze Award

The Xigmatek Loki is a CPU cooler with tower heatsink, three U-shaped heatpipes and a 92 mm fan. Let’s check it out!

It is curious that Xigmatek offers a CPU cooler named Thor’s Hammer (which we already tested) and another one named Loki, since in Norse mythology (and in Marvel Comics stories as well) Loki is Thor’s adversary. We cannot understand the point in naming a product after a bad guy.

The Loki box is small and simple, as you can see in Figure 1.

Xigmatek Loki
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Figure 1: Package

The box contents are shown in Figure 2: heatsink, fan, manuals, thermal compound, and installation hardware. The cooler came with only one fan, but it comes with the hardware necessary to install a second 92 mm fan.

Xigmatek Loki
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Figure 2: Accessories

Figure 3 shows the Xigmatek Loki heatsink.

Xigmatek Loki
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Figure 3: The Xigmatek Loki heatsink

This cooler is discussed in detail in the following pages.

The Xigmatek Loki

Figure 3 shows the cooler from the front. Here you can see the border fins are irregular.

Xigmatek Loki
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Figure 4: Front view

In Figure 5, you see the side of the heatsink. The folded fins make an almost completely closed surface.

Xigmatek Loki
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Figure 5: Side view

On the top of the heatsink, shown in Figure 6, you can see the slots for installing the fans on both sides. The tips of the three U-shaped heatpipes are also visible.

Xigmatek Loki
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Figure 6: Top view

The Xigmatek Loki (Cont’d)

The base of the cooler is shown in Figure 7. The heatpipes touch the CPU directly, and there is a big gap between them.

Xigmatek Loki
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Figure 7: Base

In Figure 8, you can see the 92 mm fan that comes with the Xigmatek Loki. It is a PWM model, thus having four pins in the connector.

Xigmatek Loki
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Figure 8: Fan

Figure 9 reveals the Xigmatek Loki with the fan in place. It is held by four rubber pieces.

Xigmatek Loki
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Figure 9: Fan installed

Installation

Figure 10 shows the clips for installation on Intel CPUs screwed to the base of the cooler.

Xigmatek Loki
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Figure 10: Clips installed

Figure 11 presents the universal backplate with the screws inserted in holes corresponding to socket LGA1156 (at the left) and the clip for use with AMD processors (at the right).

Xigmatek Loki
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Figure 11: Backplate and AMD clip

The backplate must be inserted from the solder side of the motherboard, and then held in place by four thumbnuts, as shown in Figure 12.

Xigmatek Loki
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Figure 12: Backplate installed

After that, you need to put the cooler over the CPU, and then screw four nuts. Figure 13 shows the Xigmatek Loki installed, with the fan already in place.

Xigmatek Loki
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Figure 13: Cooler installed

We installed the cooler according to the manual, as shown in the pictures on this page, but when we turned on the computer, the cooling performance was so poor that the computer shut down as soon as we demanded the CPU. We revised the installation and noticed that the cooler was barely touching the CPU, but not pressing it, due to the height of the thumbnuts, which kept us from applying pressure on the clip. So we reinstalled the clips in the position shown in Figure 14, which solved the problem.

Xigmatek Loki
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Figure 14: New position for the clips

How We Tested

We tested the cooler with a Core i7-860 CPU (quad-core, 2.8 GHz), which is a socket LGA1156 processor with a 95 W TDP (Thermal Design Power). In order to get higher thermal dissipation, we overclocked it to 3.3 GHz (150 MHz base clock and 22x multiplier), keeping the standard core voltage (Vcore), which was the maximum stable overclock we could make with the stock cooler. Keep in mind that we could have raised the CPU clock more, but to include the stock cooler in our comparison, we needed to use this moderate overclock.

We measured noise and temperature with the CPU idle and under full load. In order to get 100% CPU usage in all threads, 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 the Intel stock cooler with a copper base (included with the CPU), as well as with other coolers. Note that in the past, we tested coolers with a socket LGA775 CPU, and 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 in the next page. Every cooler was tested with the thermal compound that accompanies 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 left panel of the case was open.

The sound pressure level (SPL) was measured with a digital noise meter, with its sensor placed 4" (10 cm) from the fan. We turned off the case and video board cooler fans so they wouldn't interfere with the results. 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 isn't the case here.

Hardware Configuration

Operating System Configuration

Software Used

Error Margin

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

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 idle and 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 minimum speed on the idle test and at full speed on the full load test.

 

Idle Processor

Processor at Full Load

Cooler Room Temp. Noise Speed Core Temp.

Noise

Speed Core Temp.
Intel stock (socket LGA1156) 14 °C 44 dBA 1700 rpm 46 °C 54 dBA 2500 rpm 90 °C
Cooler Master Hyper TX3 G1 14 °C 47 dBA 2050 rpm 33 °C 56 dBA 2900 rpm 62 °C
Zalman CNPS10X Extreme 14 °C 45 dBA 1400 rpm 27 °C 53 dBA 1950 rpm 51 °C
Thermaltake Silent 1156 14 °C 44 dBA 1200 rpm 38 °C 49 dBA 1750 rpm 69 °C
Noctua NH-D14 14 °C 49 dBA 1250 rpm 27 °C 49 dBA 1250 rpm 53 °C
Zalman CNPS10X Performa 14 °C 46 dBA 1500 rpm 28 °C 52 dBA 1950 rpm 54 °C
Prolimatech Megahalems 14 °C 40 dBA 750 rpm 27 °C 60 dBA 2550 rpm 50 °C
Thermaltake Frio 14 °C 46 dBA 1450 rpm 27 °C 60 dBA 2500 rpm 50 °C
Prolimatech Samuel 17 14 °C 40 dBA 750 rpm 40 °C 60 dBA 2550 rpm 63 °C
Zalman CNPS8000A 18 °C 43 dBA 1400 rpm 39 °C 54 dBA 2500 rpm 70 °C
Spire TherMax Eclipse II 14 °C 55 dBA 2200 rpm 28 °C 55 dBA 2200 rpm 53 °C
Scythe Ninja3 17 °C 39 dBA 700 rpm 32 °C 55 dBA 1800 rpm 57 °C
Corsair A50 18 °C 52 dBA 1900 rpm 33 °C 52 dBA 1900 rpm 60 °C
Thermaltake Jing 18 °C 44 dBA 850 rpm 34 °C 49 dBA 1300 rpm 60 °C
GlacialTech Alaska 18 °C 43 dBA 1150 rpm 36 °C 51 dBA 1600 rpm 60 °C
Deepcool Gamer Storm 18 °C 43 dBA 1100 rpm 35 °C 48 dBA 1600 rpm 62 °C
Corsair A70 26 °C 56 dBA 1900 rpm 40 °C 56 dBA 1900 rpm 65 °C
Deepcool Ice Blade Pro 23 °C 45 dBA 1200 rpm 38 °C 52 dBA 1500 rpm 64 °C
AC Freezer 7 Pro Rev. 2 23 °C 47 dBA 1750 rpm 44 °C 51 dBA 2100 rpm 77 °C
Corsair H70 27 °C 60 dBA 1900 rpm 37 °C 60 dBA 1900 rpm 61 °C
Zalman CNPS9900 Max 27 °C 55 dBA 1600 rpm 38 °C 58 dBA 1750 rpm 63 °C
Arctic Cooling Freezer 11 LP 25 °C 45 dBA 1700 rpm 51 °C 49 dBA 1950 rpm 91 °C
CoolIT Vantage 26 °C 60 dBA 2500 rpm 37 °C 60 dBA 2500 rpm 62 °C
Deepcool Ice Matrix 600 25 °C 46 dBA 1100 rpm 41 °C 53 dBA 1300 rpm 69 °C
Titan Hati 26 °C 46 dBA 1500 rpm 40 °C 57 dBA 2450 rpm 68 °C
Arctic Cooling Freezer 13 27 °C 49 dBA 1950 rpm 41 °C 53 dBA 2300 rpm 70 °C
Noctua NH-C14 26 °C 52 dBA 1300 rpm 37 °C 52 dBA 1300 rpm 61 °C
Intel XTS100H 26 °C 49 dBA 1200 rpm 42 °C 64 dBA 2600 rpm 68 °C
Zalman CNPS5X SZ 23 °C 52 dBA 2250 rpm 38 °C 57 dBA 2950 rpm 69 °C
Thermaltake SlimX3 21 °C 50 dBA 2700 rpm 46 °C 50 dBA 2750 rpm 99 °C
Cooler Master Hyper 101 21 °C 50 dBA 2600 rpm 38 °C 57 dBA 3300 rpm 71 °C
Antec Kühler H2O 620 19 °C 52 dBA 1400 rpm 34 °C 55 dBA 1400 rpm 58 °C
Arctic Cooling Freezer 13 Pro 20 °C 46 dBA 1100 rpm 36 °C 49 dBA 1300 rpm 62 °C
GlacialTech Siberia 22 °C 49 dBA 1400 rpm 34 °C 49 dBA 1400 rpm 61 °C
Evercool Transformer 3 18 °C 46 dBA 1800 rpm 33 °C 51 dBA 2250 rpm 65 °C
Zalman CNPS11X Extreme 20 °C 51 dBA 1850 rpm 34 °C 56 dBA 2050 rpm 61 °C
Thermaltake Frio OCK 15 °C 44 dBA 1000 rpm 27 °C 64 dBA 2200 rpm 51 °C
Prolimatech Genesis 18 °C 49 dBA 1050 rpm 30 °C 49 dBA 1050 rpm 54 °C
Arctic Cooling Freezer XTREME Rev. 2 15 °C 41 dBA 1050 rpm 32 °C 44 dBA 1400 rpm 60 °C
NZXT HAVIK 140 16 °C 48 dBA 1250 rpm 29 °C 49 dBA 1250 rpm 55 °C
Antec Kühler H2O 920 18 °C 41 dBA 650 rpm 29 °C 64 dBA 2500 rpm 49 °C
Zalman CNP7X LED 18 °C 45 dBA 1950 rpm 33 °C 48 dBA 2150 rpm 58 °C
EVGA Superclock 14 °C 43 dBA 1300 rpm 27 °C 58 dBA 2350 rpm 47 °C
Evercool Transformer 4 15 °C 46 dBA 1500 rpm 26 °C 53 dBA 1950 rpm 52 °C
Xigmatek Dark Knight 18 °C 47 dBA 1700 rpm 30 °C 53 dBA 2150 rpm 57 °C
Xigmatek Aegir 15 °C 44 dBA 1500 rpm 27 °C 50 dBA 1950 rpm 52 °C
Cooler Master GeminII S524 16 °C 45 dBA 1300 rpm 29 °C 53 dBA 1800 rpm 58 °C
Enermax ETS-T40-TA 16 °C 40 dBA 1050 rpm 28 °C 48 dBA 1800 rpm 55 °C
Corsair H80 14 °C 42 dBA 2150 rpm 25 °C 52 dBA 2150 rpm 47 °C
Akasa Venom Voodoo 13 °C 40 dBA 1000 rpm 26 °C 48 dBA 1500 rpm 51 °C
Xigmatek Thor's Hammer 15 °C 44 dBA 1500 rpm 30 °C 50 dBA 2000 rpm 55 °C
Cooler Master Hyper 612 PWM 19 °C 45 dBA 1400 rpm 30 °C 52 dBA 1900 rpm 54 °C
Xigmatek Loki 17 °C 44 dBA 1850 rpm 34 °C 55 dBA 2750 rpm 60 °C

In the graph below, at full load 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.

 Xigmatek Loki

Main Specifications

The main specifications for the Xigmatek Loki CPU cooler include:

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

Conclusions

Although the Loki character in fiction and mythology is a villain, the Xigmatek Loki is a good value/mainstream CPU cooler. It performed better than the Cooler Master Hyper TX3, from whom it seems to be “inspired.”

It is a shame that the Xigmatek Loki has an installation issue that prevents it from correctly pressing the CPU. This must be corrected by the manufacturer, but you can easily avoid problems by installing the clips over the base and not under it, or even bending the holding arms in order to allow the screws to apply force.

Considering its good cooling performance and excellent price/performance ratio, the Xigmatek Loki receives our Bronze Award.

Originally at http://www.hardwaresecrets.com/article/Xigmatek-Loki-CPU-Cooler-Review/1403


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