i9 10900k

Looks great and yeah the 10th gen is worth it since there's some good improvement. The 2080ti is a good investment but, if Nvidia drops a new series maybe you should wait until then.

I know its annoying to hear but since the the next gen gpus are dropping sometime later this year, it would probably be a good idea to wait for right now and just use what you have. But obviously since its going to be at least a few months until that happens, a 2080 ti would still last you a very long time. You just might feel a bit of buyers remorse when the new 3080/other gpus come out.

4x8GB Trident Neo Z @3600mhz dont waste your money on 8gbs, just get 16gbs dual sticks. 3000 3200 3600 speeds it doesnt even make much difference. stick to 3000mhz. who knows in the future you might want to run a 64gb setup? you just have to purchase 2 more 16gb sticks.

your psu is overkill btw, that setup is around 550-650 w but yeah you might upgrade to a more powerful setup so 850 will be good.

ah yes your psu is a bit overkill for the current setup.
And yes, as the other recommends, put your ram sticks into 2x16 for 32gb. and for now since RTX 30 series is out, try it!
or wait RDNA 2 ~

This is helpful!

i9 is so expensive. i7 is more than enough

Hopefully you didn't buy a 2080 TI now that the 3000 series is out.