ASUS Radeon HD 7970 Crossfire review
Posted by Hilbert Hagedoorn on: 01/08/2012 02:00 PM [ 0 comment(s) ]
When graphics cards produce a lot of heat, usually that heat needs to be transported away from the hot core as fast as possible. Often you'll see massive active fan solutions that can indeed get rid of the heat, yet all the fans these days make the PC a noisy son of a gun. Do remember that the test we do is extremely subjective. We bought a certified dBA meter and will start measuring how many dBA originate from the PC. Why is this subjective you ask? Well, there is always noise in the background, from the streets, from the HD, PSU fan etc etc, so this is by a mile or two an imprecise measurement. You could only achieve objective measurement in a sound test chamber.
The human hearing system has different sensitivities at different frequencies. This means that the perception of noise is not at all equal at every frequency. Noise with significant measured levels (in dB) at high or low frequencies will not be as annoying as it would be when its energy is concentrated in the middle frequencies. In other words, the measured noise levels in dB will not reflect the actual human perception of the loudness of the noise. That's why we measure the dBA level. A specific circuit is added to the sound level meter to correct its reading in regard to this concept. This reading is the noise level in dBA. The letter A is added to indicate the correction that was made in the measurement. Frequencies below 1kHz and above 6kHz are attenuated, whereas frequencies between 1kHz and 6kHz are amplified by the A weighting.
|TYPICAL SOUND LEVELS|
|Jet takeoff (200 feet)||120 dBA|
|Construction Site||110 dBA||Intolerable|
|Shout (5 feet)||100 dBA|
|Heavy truck (50 feet)||90 dBA||Very noisy|
|Urban street||80 dBA|
|Automobile interior||70 dBA||Noisy|
|Normal conversation (3 feet)||60 dBA|
|Office, classroom||50 dBA||Moderate|
|Living room||40 dBA|
|Bedroom at night||30 dBA||Quiet|
|Broadcast sstudio||20 dBA|
|Rustling leaves||10 dBA||Barely audible|
There's a lot of differences in measurements amongst websites. Some even place the dBA meter 10cm away from the card. Considering that's not where your ear is located, we do it our way.
For each dBA test we close the PC/chassis and move the dBA gun 75 cm away from the PC. Roughly the same proximity you'll have from a PC in a real-world situation. Above, the IDLE (desktop mode) results where the GPU hardly has to do anything.
The Idle results are brilliant, the fan will even turn itself off when the GPU idles.
For the card in a fully stressed status (in-game) in Crossfire mode reaches 43 DBA, now that is quite audible yet too annoying. It means you can strongly hear airflow.
We review the ASUS Radeon HD 7970 ROG MATRIX PLATINUM graphics card. Designed to be one of the most tweak-able and desirable graphics cards.
ASUS Radeon HD 7970 DirectCU II review
We review the ASUS Radeon HD 7970 DirectCU II. A factory overclocked three slot wide beast with massive cooling capacity. The completely customized card comes with voltage measurement points, a 12-phase VRM circuitry with supper alloy caps and chokes as well as a special SAP capacitor added to maximize overclocking headroom, according to ASUS.
ASUS Radeon HD 7970 Crossfire review
We review the Radeon HD 7970 in Crossfire, a second board partner card has arrived. Let's take it to the next level -- multi-GPU gaming in Crossfire mode.
ASUS Radeon HD 6770 DirectCU Silent review
Today we look at the ASUS Radeon HD 6770 DirectCU Silent edition. An entry level product series for gamers based on a juniper graphics core that still can flex its muscle. The x-factor for this particular product however is that its completely passively cooled, what should be a relatively small card .. ends up like the USS enterprise in terms of size and design.