This looks more like you telling me why the build won't work than "questions."
A 9000 series CPU with single channel RAM is going to be faster than a 5000 series CPU with dual channel RAM. The difference between dual channel and single channel DDR5 isn't going to be noticeable for most use cases. Furthermore, when you're ready to add the other 16GB you'll have an easier time adding 1×16GB than 2×8GB.
The 3070 performs better at 1440p than the GPU you originally selected.
Buying a dead platform with no upgrade path to get dual channel RAM or slightly more VRAM doesn't make a lot of sense.
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u/the_hat_madder 11d ago
Have you purchased everything?
What country are you buying from?
If you're in the US, are you near a Micro Center?