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Saturday, 15 September 2018

Nvidia makes GPU overclocking a lot smarter with “Scanner”

Nvidia's new 20-series video cards, due to ship next week, will introduce a new overclocking system: Scanner.

Overclocking is typically a trial-and-error process: increase the clock speed, run some intensive workloads to make sure everything works OK, maybe fiddle with the GPU voltage to eke out a bit more stability. Push the clock speed too high, and the system stands a good chance of locking up and crashing. This means that finding the optimal settings can cause lots of rebooting and adjustment. Verifying that the GPU really is stable at a given speed is also a challenge, as not all workloads use all parts of the chip. A given clock speed might be fine for some kinds of software but not others.

Scanner will make this process a lot more automatic and trustworthy. It will run incrementally and increase the clock speed and voltage of the GPU to build a profile of a specific card's capabilities, testing the GPU's computing ability at each speed to make sure that it's operating properly. Generally there will be arithmetic errors, rather than outright crashes, when the GPU is being operated only very slightly faster than it can support. So by making only small adjustments, Scanner can probe the limits of what the chip can handle without the crashes and reboots, and without human intervention. The whole process takes about 20 minutes.

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