I made two games with a system that has a budget Intel CPU (compared to your higher-end Ryzen) and a 4GB 1050Ti GPU, and 99% of my renders had to be CPU rendered. One game of mine is mainly G8/G8.1 and the other is all G9.
So, ya... you can easily make a game with G8 or G9 characters. You just need to learn all the tips and tricks to operate at the low end of the specs.
Upgrade your system memory to 32Gb at least though. 16GB is nothing, nowadays. And it helps you multi-task while running DAZ.
As for rendering with a lower end system... learn to layer your scenes. Do backgrounds separately, then render the Genesis characters alone and layer them on top. Use Dome (Not drawn) and Scene with a Ground Plane to generate shadows that can be layered over top of your backgrounds. Learn to use the Spot Rendering feature of Daz... it's a life changer for people who can't render a full frame scene in one pass!
Just as an example.. a typical 1080p render where you have multiple characters in a reasonably complex inside environment, lighted with Ghost Lights and other lighting, can easily take you hours on a system like yours. But if you do the environment separate - you can run it at night using Batch Render. Run it for 2000 iterations or so (~ 1-2 hours). Then run that through a denoiser, like the
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one. Then render the characters alone, using regular 3 point lighting and they will probably render out in under 30 minutes and look much sharper. Then you can do several poses on the same background image.
Learn different lighting techniques and experiment! I can't stress this enough as lighting is probably the #1 biggest influence on how fast you can cook a render.
Fastest way to light a scene is using HDRI domes, and Ghost lights are great for large amounts of light and are easy to use, but they really make DAZ work when it comes time to render them. Personally, I prefer traditional 3-point lighting for all my characters and I play with temperature to make scenes warmer or colder. I also adjust the size of the lights to make then sharper or more soft. And learning how to apply emissive surfaces to objects is another technique for doing nice effects.
As you probably already guessed from reading what I wrote so far, you need to also learn how to use an image editor of some sort. One that lets you use layers. I use Photoshop, but many people like GIMP, because it's free. But if you want to use DAZ with a lower end system, you have to be able to post process in an editor.
As for the G8 vs G9 debate, I decided to switch to G9 with my last project. I like working with the newest generation and honestly, all the assets coming out nowadays are NEW! It's hilarious how many games on F95 have some clothes and hair that are so well known and used that you feel like you are seeing characters doing cameos in other games, lol.
G8 still has the larger library, true... but G9 is catching up, and the skin textures and realism of some of the G9 characters now is amazing. Personally, I don't feel like the G9's bloat any scenes on their own .... in fact, it's almost always the environment that can get out of control and bloat your scenes. I have hundreds of scenes with 2 and 3 G9's and they usually equate to DUF file sizes of between 10-20 MB's and when rendering, around 10GB of VRAM or so. But when I put them in a complex environment like the off the shelf apartments, for example, your DUF files can easily bloat to 100MB and more, with the hundreds of 4K textures those environments load in with. That's where scripts like Scene Optimizer can help you. I never really used that script though.. instead, I layered my renders like I outlined above instead.