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Some of the card's inner workings can be revealed by taking a look at the BIOS.
We used GPU-Z to extract the board's BIOS and Radeon
BIOS Editor to examine its contents.
ATI HD 4870 1GB: BIOS Clock/voltage settings.
Displayed in green, yellow and red are the card's settings for idle, UVD, and
3D. According to the BIOS, core voltage is 1.053V when idle and increases to
1.313V on load. We confirmed the idle and 3D frequency changes with GPU-Z, but
during video playback the card used the 3D clock speeds.
ATI HD 4870 1GB: BIOS Fan settings.
The fan control behavior follows a simple linear progression starting at a
GPU temperature of 25°C and finishing at 101°C. This is a very aggressive
setting our reference 4870 does not increase its fan speed until the GPU
hits 58°C. There doesn't seem to be a good reason for this change.
MP3 SOUND RECORDINGS
These recordings were made with a high
resolution, lab quality, digital recording system inside SPCR's
own 11 dBA ambient anechoic chamber, then converted to LAME 128kbps
encoded MP3s. We've listened long and hard to ensure there is no audible degradation
from the original WAV files to these MP3s. They represent a quick snapshot of
what we heard during the review.
These recordings are intended to give you an idea of how the product sounds
in actual use one meter is a reasonable typical distance between a computer
or computer component and your ear. The recording contains stretches of ambient
noise that you can use to judge the relative loudness of the subject. Be aware
that very quiet subjects may not be audible if we couldn't hear it from
one meter, chances are we couldn't record it either!
The recording starts with 5~10 seconds of room ambiance, followed by 5~10 seconds
of the VGA test system without a video card installed, and then the actual product's
noise at various levels. As this particular card did not add any noise the test
system, we have provided only a recording of the test system with its system
fan set to the levels tested. For the most realistic results, set the
volume so that the starting ambient level is just barely audible, then don't
change the volume setting again.
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