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What makes the GPU lose stability?Īs frequency of the core clock continues to increase, the GPU will degrade in its stability.

There are still longevity and endurance concerns with high overclocks, so it's unlikely that manufacturers will pre-overclock GPUs into the numbers we can achieve manually. Manufacturers may bin (sort) for higher-quality chips that will perform with greater stability at higher frequencies and voltages. There's a reason that the GPU doesn't just ship at its highest possible overclock, though.Įvery GPU has a defined “stable baseline” that achieves the TDP, thermal, and stability targets established by the semiconductor manufacturer – that'd be nVidia or AMD, in the case of relevant gaming GPUs. “Overclocking” is specifically referring to the action of increasing the clock-rate over stock, a process that eventually requires “overvolting” to ensure stability. Now go look at a CPU with a 4.0GHz clock-rate – it's staggeringly impressive that such a small semiconductor can cycle four billion times per second.Īlthough there's a lot more at play that determines our performance – because frequency is certainly not everything – the core clock-rate is what we spend most of our time modifying when overclocking a GPU. This unit of measurement can be translated as “oscillations per second” or “cycles per second,” so a 60Hz monitor would refresh 60 times per second a 1500MHz core clock on a GPU would poll 1.5 billion times per second (1MHz = 1 million hertz). As you all know, CPU and GPU frequencies are measured in hertz, normally in the millions or billions of hertz. I'll re-cover a few of those items before getting started.Īll microprocessors operate on a timed “clock-rate.” This clock “ticks” with regular, predictable intervals – just like a wall clock would – and does so at a frequency. We've previously written a CPU & GPU overclocking primer that explained the top-level basics of overclocking.