It was much debated on the Internet what SoC Nintendo's Switch is using. Some say it is powered by Nvidia's 2 years old Tegra X1, others say it is powered by a custom Tegra Pascal chip. It seems we finally have an answer as ARM claimed the Switch will be powered by 4x ARM Cortex-57 cores. For reference, the X1 also uses four ARM Cortex-57 cores. While Nvidia's Pascal based Tegra P1 chip utilises four Cortex-57 cores as well, it also has 2 additional Denver2 cores that are lacking in the X1 and ARM's announcement. That means it's very likely that Nintendo went with the X1, although with some sort of possible customization. Source Update Someone asked ARM via email about the facebook post and ARM says it was 'not an official statement' and removed the post. Whether it was posted by mistake or if there is any other reason behind it is anyone's guess. ARM notably didn't deny the truthfullness of the post, but at present the Switch's SoC remains unconfirmed.