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Intel’s Core i5-9400F processor from Intel has a 2.9 GHz base clock speed and a 4.1 GHz maximum boost speed. It is Compatible with LGA 1151 motherboard sockets. This 9th-generation Core i5 CPU has a 9MB Intel Smart Cache and supports DDR4-2666 memory, and it also supports Intel Optane memory. This F-series processor lacks an integrated graphics card, thus you need to use it with a discrete graphics card.

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Intel® Desktop Processors Socket LGA1151 and LGA1200 Comparison