Do I need a graphics card with the Ryzen 5 3400G?

No. It has Radeon Vega 11 integrated graphics, so it can drive a monitor on its own. A discrete card is only needed for demanding games or GPU work.

Is the Ryzen 5 3400G worth it over the Ryzen 5 3600?

Only if you want integrated graphics. The 3600 has six cores, a larger cache and PCIe 4.0, but no onboard graphics, so it needs a separate card.

It uses the AM4 socket. It works with AMD X370 and X470 chipsets and other AM4 boards with a supporting BIOS.

Yes, the boxed version includes an AMD cooler, so no separate CPU cooler is required.

DDR4 in dual-channel. The chip officially supports up to DDR4-2933, so faster kits run at that speed or need manual tuning.

Four cores and eight threads, with a 3.7 GHz base clock and 4.2 GHz boost.

At eBay, for $34.50, 92% under what the other stores charge, as of our latest check.

14 stores we checked sell it, including Amazon, eBay, Newegg.com, Mercari, Bigwig PC.

$34.50at eBayChecked 1 h ago

92% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

It checks today's price at every store, compares the alternatives and answers in about a minute.