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Graphics Processing Unit, a processor dedicated to producing the display output.

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What Causes rMBP Fan Noise When Connected to Two External Monitors

Update 01/25/15: iStat Menu: iStat Menu monitors both CPU/GPU usage and temperature. Compared to only one external monitor, two external monitors causes CPU & GPU temperature up by 20F higher. … However, CPU & GPU usage & GPU memory usage all remain the same. The bottom line is that iStat Menu can't explain the increase in CPU/GPU temperature. …
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