1. With more available RAM you you will get better performance from DAZ in all aspects, for example in the scene window where you do most of the work with poses, textures, props, hair and clothes pairing.
2. OptiX Prime Acceleration for my opinion saves 20-25% of rending time (on my 3950X 16 cores Ryzen 64Gb RAM). Turn it on in Render Settings tab:
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For i7 (4 or 8 cores) and 16 Gb RAM effect of OptiX should be less visible, but if you are not against to give DAZ all your available RAM (It will consume all, believe!), you can try.
3. With more available RAM your can render on CPU almost any complex scene. Yes, it is slower, then on GPU, but you will not have any real limitation for textures or models with GPU RAM 'overload' issue. Don't forget to include de-noising features, if you render on CPU, your will have a very good grain dumping even on 600-800 iterations with ~20-30% image official 'conversion':
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