For games like Fortnite, Warzone, CSGO, and other popular multiplayer games, 16GB of RAM should be safe for streaming. If you want your RAM to be relevant for at least the next five years, you should aim to get at least a total of 32GB RAM. While measuring how much RAM you need for a game is hard enough, streaming will have more variables involved.
The most obvious distinction is the amount of memory each variant offers. 16 GB of RAM provides 16 Gigabytes of memory, while 32 GB of RAM provides 32 Gigabytes of memory. More RAM capacity means the system has a larger temporary workspace to store data and actively used instructions, which can lead to improved performance in various scenarios. 2.
DDR4 RAM is not nearly as finicky as DDR3 was. Linus Tech Tips did a video demonstrating you can mix and match without issue. You should obviously try to get RAM with the same specs as your current kit though because the system will typically only be able to run at the speed/latency of the slowest stick.
Here are some basic guidelines for how much RAM you should have: 8GB RAM: This should only be for projects smaller than 1080p and if you are fine with closing down background programs. 16GB RAM: Will work for projects that are 1080p-4k 8bit. This will allow minor usage of background projects as well. 32GB RAM: This can carry a heavy load for
1. Buy the 4070ti and hope vram won't be a problem in the future. 2. Buy a 3090 (which is cheaper here) and than waiting 2 years to buy something better. 3. Buy an rx 7900xt for the same price as a 4070ti, but have a lot less features than a nvidia card, and also worse productivity outside of video rendering.

Testing and comparing benchmarks in 5 games using 16Gb of RAM and 32GB, as well as performance with and without a page file (Virtual Memory)If 16GB is the sw

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is 16gb ddr4 ram enough for gaming