NZXT Havik 140 Heatsink Review
Author: Dennis Garcia
Published: Thursday, February 16, 2012
Benchmarks
The HZXT Havik 140 is designed for all Intel Socket LGA1156 / 1155 / 775 and Athlon64/Phenom processors. Follow the instructions on how to install this heatsink on each platform.
Here is an overview of the system and testing methodology.
Here is an overview of the system and testing methodology.
The system as it was tested
EVGA Z68 FTW Intel Z68 Chipset
Intel Core i7 2600K (3.5Ghz) Quad Core 4 x 256KB L2 Cache 8MB L3 Cache
NZXT Havik 140
OEM Heatsink
The CPUID System Monitor was used to obtain and record system temperature data and being that this is a quad core processor we need something that will work across all of the cores at once. For this task we're using a new version of Prime95 (p95v255a) that will allow you to spawn (n) instances to test with.
Intel Core i7 2600K (3.5Ghz) Quad Core 4 x 256KB L2 Cache 8MB L3 Cache
NZXT Havik 140
OEM Heatsink
The CPUID System Monitor was used to obtain and record system temperature data and being that this is a quad core processor we need something that will work across all of the cores at once. For this task we're using a new version of Prime95 (p95v255a) that will allow you to spawn (n) instances to test with.
Editors note: Even though the Windows 7 task manager reported 100% processor usage we could never attain a 100% of the rated heat output as documented by Intel (see below) when using Prime95 as a basis for that heat production. Knowing this we ran the stress test until the maximum temperature was attainted and stabilized.
Other things to consider when judging software induced heat output.
a) Clock throttling by the processor at high temperatures.
b) Normal software isn't designed to produce maximum heat output.
c) Variances of cooling temperature.
d) Variances in CPU load.
e) Inaccuracies in thermal diode readouts.
Of course the list goes on..
Our testing methodology is aimed to provide a real world look into this heatsink given the test system provided.
Other things to consider when judging software induced heat output.
a) Clock throttling by the processor at high temperatures.
b) Normal software isn't designed to produce maximum heat output.
c) Variances of cooling temperature.
d) Variances in CPU load.
e) Inaccuracies in thermal diode readouts.
Of course the list goes on..
Our testing methodology is aimed to provide a real world look into this heatsink given the test system provided.
Default Speed
A C/W rating can quickly be calculated using this formula.
C/W = (CPU temp - Ambient temp)/(Variance(%) * CPU Watts)
Allowed variance for this test = 85%
CPU Watts = 95W
0.21 C/W = (40C - 23C)/(.85(95W))
C/W = (CPU temp - Ambient temp)/(Variance(%) * CPU Watts)
Allowed variance for this test = 85%
CPU Watts = 95W
0.21 C/W = (40C - 23C)/(.85(95W))
Overclocked
For this next test the CPU speed was cranked up to 4.5Ghz and the test was re-run.
To calculate a new C/W rating for this test we will need to factor in the increased processor wattage. The formula and constants for this are listed below.
ocC/W = dCPU Watts * (ocMhz / dMhz) * (ocVcore / dVcore)2
ocMhz = 4500
dMhz = 3500
ocVcore = 1.39
dVcore = 1.2
The variance still applies for our C/W calculation
Allowed variance for this test = 85%
CPU Watts = 163W
0.23 C/W = (55C - 23C)/(.85(163W))
ocC/W = dCPU Watts * (ocMhz / dMhz) * (ocVcore / dVcore)2
ocMhz = 4500
dMhz = 3500
ocVcore = 1.39
dVcore = 1.2
The variance still applies for our C/W calculation
Allowed variance for this test = 85%
CPU Watts = 163W
0.23 C/W = (55C - 23C)/(.85(163W))
Benchmark Conclusion
In our heatsink and waterblock tests we don't really focus on overall load temperatures but rather how well the product can remove heat given a specified heat load. Since this is a real world testing method we need to take into consideration real world variables and estimate tolerances. This is why we normally only apply 85% of the total wattage output to our heat calculations.
The resulting C/W number is used to rate how efficient a heatsink or waterblock is based on the given heat load. These numbers can be used to determine heat capacity, the larger the difference the less efficient the heatsink is. (aka not good for overclocking)
During this test we were able to pump an estimated 163w into the heatsink and while overall temps are still less than stock the C/W rating indicates that the Havik has started to become saturated. This is not uncommon considering the heat load however, we don't normally see this sort of increase with such a mild overclock or voltage increases.
It should also be noted that we did test this heatsink using both 140mm fans operating in a push pull configuration at full speed. Despite the unique fan design and total airflow the fact that the fan is bigger than the heatsink means that the majority of the high speed air isn't touching the heatsink at all. Had this cooler been enlarged or come with smaller fans the performance numbers may have improved.
Keep in mind these calculations are provided for demonstration purposes only and may not reflect the actual lab tested C/W rating, but we're pretty close.
The resulting C/W number is used to rate how efficient a heatsink or waterblock is based on the given heat load. These numbers can be used to determine heat capacity, the larger the difference the less efficient the heatsink is. (aka not good for overclocking)
During this test we were able to pump an estimated 163w into the heatsink and while overall temps are still less than stock the C/W rating indicates that the Havik has started to become saturated. This is not uncommon considering the heat load however, we don't normally see this sort of increase with such a mild overclock or voltage increases.
It should also be noted that we did test this heatsink using both 140mm fans operating in a push pull configuration at full speed. Despite the unique fan design and total airflow the fact that the fan is bigger than the heatsink means that the majority of the high speed air isn't touching the heatsink at all. Had this cooler been enlarged or come with smaller fans the performance numbers may have improved.
Keep in mind these calculations are provided for demonstration purposes only and may not reflect the actual lab tested C/W rating, but we're pretty close.
