Can this processor be overclocked, and if so, what is the safe maximum boost frequency?

Yes, this processor can be overclocked. The maximum boost frequency is 3.9 GHz.

Does this AMD Ryzen 5 2400G processor come with integrated graphics, and if so, what kind?

Yes, this AMD Ryzen 5 2400G processor comes with integrated graphics, specifically Radeon Vega RX 11 Graphics.

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OEM - AMD RYZEN 5 2400G Quad-Core 3.6 GHz (3.9 GHz Max Boost) Socket AM4 65W YD2400C5FBBOX Desktop Processor - Without Box,No Cooler,No Warranty