Alpenfohn Vs Prolimatech Air cooler Review
Published: 1st March 2013 | Source: Alpenfohn and Prolimatech | Price: |
Intel i7 3960X
Stock@ 1.1v (undervolted)
4.0GHz @ 1.25v
4.4GHz @ 1.35v
4.6GHz @ 1.45v
Gigabyte X79 UD3
Corsair Vengeance LP Memory
Corsair HX850 V2
Corsair Force GT 60GB
Coolermaster Storm Trooper
As you can see from the detail above we'll be testing our coolers at varying levels of overclock and increasing levels of voltage. this in turn of course means increasing levels of heat which the coolers need to dissipate. To begin with we start with the undervolted stock speed. Why undervolted? well if you have things set on "Auto", you may well be using more volts than are actually required to run at the chosen frequency, for example our 3960s will run quite happily at just 1.1volts, solid as a rock, 24/7, and as such we use this as our starting point.
Continuity is very important in testing, and for this reason we keep as many of the potential variables as locked down as possible. We will be using OCCT in Linpack X64, AVX compatible with all logical cores tested and 90% free memory utilised. The test is set up to run automatically with just a few clicks to set it going. A 10 minute idle followed by 30 minutes of testing and a 5 minute cool down is the order of the day and brings the total test time per clock speed to 45 minutes. So as to remove subjectivity in determining whether a CPU has failed, OCCT is set to stop the test and register a fail should the max temp exceed 80 degrees. In testing we noted that if even one of the cores exceeds 82 degrees OCCT halts the test and a fail is recorded.
Turning now to the 4GHz test we up the voltage to 1.25 volts, this is what is deemed normally as stock volts. Something we are always harping on about on the forums is AUTO does not mean stock volts, and normally if you overclocking with "auto" volts the motherboard will be upping the volts much more than needed if you were to do it manually. By whichever means it happens, upping the volts (especially from our 1.1v undervolt) does have a big impact on temps, with an average increase of 10-15 degrees seen in the results.
Upping the volts still further we achieve a stable 4.4gHz overclock at 1.35 Volts. It's here we start to separate the wheat from the chaff, with lesser coolers not able to disperse the increased heat effectively. Again we see an jump of 10 degrees or so from the figures at 4GHz. Both the H100 and the well respected D14 are creeping into the 70s here, indicating that only the cream of the crop will excel at this level.