Which is better for gaming?

The 9800X3D, by a wide margin. Its 3D V-Cache keeps games fed, and it is the fastest gaming CPU you can buy. The 7700 is fine for 60 fps play but trails in CPU-heavy titles.

Can I put the 9800X3D in my old AM4 board?

No. The 9800X3D is AM5 only and needs DDR5 memory. If you want to keep your AM4 board and DDR4, the 7700 is the drop-in choice.

Is the 9800X3D worth the extra money?

For a high-refresh gaming build, yes. For office work, browsing and light editing, the 7700 does the job for much less, and you avoid the cost of a new board and DDR5.

The 7700. It is a 65 W class part that a basic air cooler handles. The 9800X3D is rated 120 W TDP and wants a strong cooler, especially under all-core loads.

Do both have integrated graphics?

The 9800X3D lists Radeon integrated graphics, enough for display output and troubleshooting. The 7700 listing does not show usable integrated graphics, so plan on a discrete GPU.

Which lasts longer before an upgrade?

The 9800X3D, because AM5 is the current socket with future CPUs to come. AM4 is end-of-life, so the 7700 is the last stop on that platform.

AMD Ryzen 7 9800X3D vs AMD Ryzen 7 7700

Buy the Ryzen 7 9800X3D for a new AM5 gaming build where frame rate matters most; its 3D V-Cache makes it the fastest gaming CPU you can buy, and it needs DDR5 and a new board. Buy the Ryzen 7 7700 for a cheaper AM4 upgrade or a general-purpose desktop, since it drops into existing AM4 boards with DDR4 and costs far less. No prices were given for either chip, so compare live store prices on this page before deciding.

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