Should I build this PC on AM4 or AM5 with a 16GB RTX 5060 Ti?

I’d lean toward AM5 because it gives you a much better upgrade path. AM4 is essentially finished for new builds, while an AM5 system can receive newer processors later. That said, try not to run only one 16GB memory stick if you can avoid it—2x8GB will usually perform better in games because it runs in dual channel. You could start with 2x8GB and replace it with 2x16GB later, or save a little longer for 32GB DDR5.

The 7700X may also be more CPU than this graphics card needs. A less expensive AM5 processor could free up money for 32GB of DDR5 or a better GPU. The best choice depends on your games, resolution, local prices, and whether you plan to upgrade later, but for a brand-new build I’d generally choose AM5 with dual-channel memory and adjust the GPU or CPU budget to fit 32GB if possible.

Before deciding on the platform, reconsider the graphics card. The 16GB RTX 5060 Ti can be poor value depending on your local pricing. An RX 9060 XT 16GB may offer similar performance for less, while cards such as the RX 9070 or 9070 XT can be substantially faster if they cost the same in your area. Spending less on the GPU could leave enough room for 32GB of DDR5.

For gaming, 16GB of RAM is still workable if you mainly have a game, voice chat, and a few background apps open. If you multitask heavily, use demanding creative software, or want the system to last several years without an upgrade, 32GB is the safer choice. AM4 with 32GB can still work as a budget build, but I wouldn’t choose it over AM5 unless the price difference is significant.