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  • Thermaltake Silent 1156 Heatsink Review
  • Thermaltake Silent 1156 Heatsink Review



    The ThermalTake Silent 1156 is designed for all Intel 1156 processors; here is an overview of the system and testing methodology.
    The system as it was tested
    EVGA P55 Classified Intel P55 Chipset
    Core i5 750 2.66Ghz
    ThermalTake Silent 1156
    OEM Heatsink
    The onboard thermal sensor was used to obtain and record system temperature and cross checked using the EVGA e-leet monitor software.  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 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.
    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

    0.31 C/W = (47C - 22C)/(.85(95W))
    For this next test the FSB was cranked up to 160Mhz 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 = 3200
    dMhz = 2660
    ocVcore = 1.28
    dVcore = 1.18
    The variance still applies for our C/W calculation
    Allowed variance for this test = 85%
    CPU Watts = 134W

    0.35 C/W = (62C - 22C)/(.85(134W))
    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)

    Here we have a heatsink that does perform better than the stock OEM solution, but does have limited capacity.  The resulting C/W numbers do show an increase between our default and overclocked tests meaning that as the processor heat output increases the Silent 1156 begins to lose its ability to handle the load. 

    Keep in mind these calculations and results are based on our lab testing procedure used to illustrate a real world look into heatsink performance.  The numbers may not reflect the actual lab tested C/W rating, but we're pretty close.  wink smile