This article explains what to expect from laptops with Nvidia MX250 and MX230 graphics chips, how these GPUs compare to the popular MX150, as well as provides a complete list of portable devices bundled with these chips.
The Nvidia GeForce MX250 replaces the MX150 starting from the first half of 2019, and is still a discrete graphics chip based on the Nvidia Pascal architecture, while the GeForce MX230 replaces the entry-level MX130 chip and is a very similar chip, also based on the Pascal architecture, unlike the previous MX130 that was based on Maxwell and pretty much a rebadged 940MX.
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https://www.ultrabookreview.com/26030-laptops-nvidia-mx250-mx230/