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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 Radeon HD 5450:
Clock settings. Boot/3D/UVD setting in red, idle in green.
The 5450 uses clock speeds of 650/900MHz in 3D and when UVD is at work. Its
idle clocks run at 157/200Mhz.
ATI Radeon HD 5570:
Clock settings. Boot/3D setting in red, idle in green, UVD in yellow.
The 5570 maintains clock speeds of 650/900MHz in 3D, 400/900MHz when UVD is
activated, and 157/200MHz when idle.
According to the BIOS, the 5570's fan rises slowly, spinning at 30% of maximum
until it reaches 45°C. It then increases linearly until the core temperature
hits 109°C when the fan speed tops out.
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