Testbed and Methods
We are going to test the cooling efficiency of AMA coolers and their only today’s competitor in the following testbed:
- Mainboard: ASUS P6T Deluxe (Intel X58 Express, LGA 1366, BIOS 2004);
- Processor: Intel Core i7-920, 2.67 GHz, 1.25 V, 4 x 256 KB L2, 8MB L3 (Bloomfield, C0);
- Thermal interface: Arctic Cooling MX-2;
- Graphics card: ATI Radeon HD 5670 512 MB GDDR5, 775/4000 MHz (with Alpenföhn Heidi cooler);
- Memory: DDR3 3 x 2 GB Wintec AMPX 3AXH1600C8WS6GT (Spec: 1600 MHz / 8-8-8-24 / 1.65 V);
- System HDD: Western Digital VelociRaptor (SATA-II, 300 GB storage capacity, 10,000 RPM, 16 MB cache, NCQ) inside Scythe Quiet Drive 3.5” silencer and cooler chassis;
- System case: Antec Twelve Hundred (front panel: two Noiseblocker NB-Multiframe S-Series MF12-S1 fans at 900 RPM and Scythe Gentle Typhoon fan at 900 RPM; back panel: two Scythe SlipStream 120 fans at 900 RPM; top panel: standard 200 mm fan at 400 RPM; side panel removed);
- Control and monitoring panel: Zalman ZM-MFC2;
- Power supply: Zalman ZM1000-HP 1000 W (with a default 140 mm fan).
During this test session we managed to overclock our 45 nm quad-core processor (with polished heat-spreader) with the multiplier set at 21x and “Load-Line Calibration” enabled to 3.8 GHz using the weakest cooler in quiet mode. The nominal processor Vcore was increased to 1.2875 V in the mainboard BIOS.
The memory voltage was at 1.6 V and its frequency was around 1.43 GHz (7-7-7-14_1T timings). All other parameters available in the mainboard BIOS and connected with CPU or memory overclocking remained unchanged (set to Auto).
All tests were performed under Windows 7 RTM x64 operating system. We used the following software during our test session:
- Linpack 64-bit with LinX shell version 0.6.4 – to create maximum CPU load (5 Linpack runs in each cycle with 4096 MB RAM capacity involved);
- CPU-Z 1.53 – to monitor processor core voltage and frequency;
- Real Temp 3.50 RC6 – to monitor the processor core temperature;
- Everest 5.30.2018b – to monitor default fans rotation speeds.
So, the complete screenshot during the test session looks as follows:
The CPU was loaded with two consecutive Linpack test runs with the settings as indicated above. The stabilization period for the CPU temperature between the two test cycles was about 8-10 minutes. We took the maximum temperature of the hottest CPU core for the results charts. Moreover, we will also provide a table with the temperature readings for all cores including their average values. The ambient temperature was checked next to the system case with an electronic thermometer with 0.1 °C precision that allows monitoring the temperature changes over the past 6 hours. During our test session room temperature was at 24.8-25.2 °C.
The noise level of each cooler was measured between 1:00 and 3:00 AM in a closed room about 20 m2 big using CENTER-321 electronic noise meter. The noise level for each cooler was tested outside the system case when the only noise sources in the lab were the cooler and its fan. The noise meter was installed on a tripod and was always at a 200 mm distance from the cooler fan rotor. The tested cooling systems were placed at the edge of the desk on a sheet of polyurethane foam. The lowest noise reading our noise meter device can register is 29.8 dBA and the subjectively comfortable noise level in these testing conditions was around 34.5 dBA (do not mix it up with low noise level). The fan(s) rotation speed was adjusted in the entire supported range using the new controller revision by changing the voltage with 0.5 V increment.
We are going to the results of the most efficient tower-cooler out there – Noctua NH-D14, for comparison purposes. It was equipped with two 140 mm fans:
We tested the super-cooler in two modes: in quiet mode at 860 RPM and in moderate acoustic mode at 1200 RPM. AMA coolers were tested in three modes: at minimal, average and maximum fan rotation speed.