Articles: Cooling
 

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Testbed and Methods

Since CoolIT PURE is a very peculiar system, it was tested only in a closed system case as well as its competitor in our today’s test session. That is when the mainboard was in vertical position.

Our testbed was identical for all coolers and featured the following configuration:

  • Mainboard: ASUSTek P5K Deluxe/WiFi-AP (Intel P35), LGA 775, BIOS 0812
  • Processor: Intel Core 2 Extreme QX9650 (3.0GHz, 1.25V, 2x6MB L2 cache, 4x333MHz FSB, Yorkfield, C0)
  • Thermal interface: Arctic Silver 5
  • Graphics card: HIS Radeon HD 3870 512MB / 256bit, @850/2480MHz
  • Graphics card cooler: Arctic Cooling Accelero S1 + Turbo Module
  • Memory:
    • 2 x 1024MB DDR2 Corsair Dominator TWIN2X2048-9136C5D (1142MHz / 5-5-5-18 / 2.1V);
    • 2 x 1024MB DDR2 CSXO-XAC-1200-2GB-KIT DIABLO (1200MHz / 5-5-5-16 / 2.4V).
  • Disk subsystem: Samsung HD501LJ (SATA-II, 500GB storage capacity, 7200rpm, 16MB cache, NCQ)
  • Optical drive: Samsung SH-S183L SATA-II DVD RAM & DVD±R/RW & CD±RW
  • System case: System case: ASUS ASCOT 6AR2-B Black&Silver (ATX) with 120mm ~960RPM Scythe Slip Stream fans for air intake and exhaust (the fans are installed on silicon spindles) and the same fan on a side panel with ~840RPM rotation speed
  • Control and monitoring panel: Zalman ZM-MFC2
  • Power supply: Enermax Galaxy EGA1000EWL 1000W (a default 135mm fan for intake; and 80mm fan for air exhaust)

Using the weakest cooling system of our today’s testing participants we managed to overclock our quad-core processor to 3.75GHz with the Vcore increased to 1.4875V in the mainboard BIOS. The monitoring utilities reported the core voltage setting a little bit lower than what was set in the mainboard BIOS: around 1.46V.

All tests were performed under Windows XP Professional Edition SP2. SpeedFan 4.34 Beta 44 was used to monitor the temperature of the CPU, reading it directly from the CPU core sensor:

The mainboard’s automatic fan speed management feature was disabled for the time of the tests in the mainboard BIOS. The CPU thermal throttling was controlled with the RightMark CPU Clock Utility version 2.35.0:

The CPU was heated up with OCCT (OverClock Checking Tool) version 2.0.0a in a 30-minute test with maximum CPU utilization, during which the system remained idle in the first 1 and last 4 minutes of the test:

I performed at least two cycles of tests and waited for approximately 20 minutes for the temperature inside the system case to stabilize during each test cycle. Despite the stabilization period, the result of the second test cycle was usually 0.5-1°C higher. The maximum temperature of the hottest CPU core of the four in the two test cycles was considered the final result (if the difference was no bigger than 1°C – otherwise the test was performed at least once again).

The ambient temperature was checked next to the system case with an electronic thermometer that allows monitoring the temperature and humidity changes over the past 6 hours. During our test session room temperatures varied between 24.5 ~ 25°C. It is used as a staring point on the diagrams. Note that the fan rotation speeds as shown in the diagrams are the average readings reported by SpeedFan, and not the official claimed fan specifications.

The noise level of each cooler was measured according to our traditional method described in the previous articles with the help of an electronic noise meter – CENTER-321. The readings were taken at 3cm, 1m and 3m distance. The subjectively comfortable noise level was considered 34.5dBA. The ambient noise from the system case without the CPU cooler didn’t exceed 32.5dBA when measured at 1m distance

IT would make sense to add another compact system fitting into a system case to compete against CoolIT PURE. Unfortunately, we didn’t have any available at the time of tests, so we picked ZEROtherm NV120 Premium cooler, which is certainly cheaper than the liquid-cooling system we discussed today:

However, as we saw during our test session, this cooler was powerful enough to compete against CoolIT PURE. We tested ZEROtherm NV120 Premium in only one mode with the fan rotating at ~1440RPM when it generated pretty moderate noise.

 
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