Cooler Master Eisberg 120L Prestige Review
Published: 10th June 2013 | Source: Cooler Master | Price: £119.99 |
Intel i7 3960X [email protected] 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 usual 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 just one of the cores exceeds 82 degrees OCCT halts the test and a fail is recorded.
Although the Pump also had a 9v speed reducer we have conducted all testing of the pump at the full 12 volts. However as the Eisberg came with a 3 speed fan adapter we have tested at all speeds and at all overclocks. Making for a potential 12 tests which at 45 minutes per test makes for a grand total of 9 hours of testing. If you want to run at the lower pump speed, expect a 2-3 Degree increase in temps across the board.
At stock and on high fan settings the Eisberg was on a par with the recently reviewed H60 and within a degree or two of the H100 at both High and low fan speeds.
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.
The Eisberg looks better able to dissipate the heat that the increased voltage brings when compared to the H60 and the Seidon 120M. Like the Eisberg both of these are 120mm radiator units however the Eisberg benefits from the additional fan and the rubber baffles. The Eisberg also matches the X40 which although a single fan unit has a larger 140mm rad and fan.
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 a 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.
At the lowest 5v fan speed the Eisberg wasn't able to cut the mustard with the test failing after just a few minutes. At both Medium and high speeds though things were still going well with the unit still a degree or two cooler than the other 120mm units in the charts, and again trading blows with both the X40 and the H100.
Although only a 120mm unit we were hopeful that the twin fans and baffles would enable the Eisberg to pass the hard-core 4.6GHz test. Sadly it was not too be, showing just how intensive this extreme test is on a cooler.