Why you should not buy a factory overclocked GPU (Undervoltage Guide)
10GPU core consists of transistors, and they require a certain minimum voltage to operate.
Higher core frequency requires higher voltage, and higher voltage creates more heat.
Unfortunately, transistors degrade when they overheat, so manufacturers provide cooling systems and set core voltage as low as possible.
Each GPU has a set maximum operating temperature. If this maximum is reached - GPU core frequency and voltage will be reduced, to reduce temperature. This is called Thermal Throttling.
The problem of factory overclocked GPU is that they overheat and throttle.
Now, i will show you how throttling looks like, on my factory overclocked RX 480 (1303 Mhz core).
As you can see, temperature goes to 72, then rapidly descends to 66. You can also see that GPU core frequency repeatedly drops. This is throttling.
Now i will reduce core frequency to 1200 Mhz (still overclocked) and memory frequency to 1700 Mhz.
I will also reduce voltage by 100 microvolts (mV) = -0.1 volts.
As you can see GPU temperature dropped a lot and there is no throttling (frequency is fixed).
I did some tests on GPU undervoltage, while -100 mV is stable, -150 mV is clearly unstable.
Each GPU has its own minimal required voltage. Experiment to see how far you can go.
Also do not overclock or overvoltage your GPU, it can easily burn.
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