Question

I need expert advice, for a high-end VR gamming system...

I am putting together a high-end VR system, and have a general idea of what I want... but several questions have arisen...

This is the general system that I am looking at putting together:

For cooling: Asetek 690LS 360mm Liquid Cooling System.
For RAM: 16 GB [8 GB X2] DDR4-4000
For Power Supply: 850 Watt - Standard 80 PLUS Gold

For Main Hard Drive: I am looking at a 1 TB ADATA XPG SX8200PNP M.2 PCIe NVMe SSD - Is this a good idea, or a bad one? I don't know how I feel about using a M.2 SSD as a primary drive...

For Processor: I was looking at the Intel i9-9900 processor... and noticed that there is also one with a "k"... I read in an article that only a processor with a "k" at the end can be overclocked...
1. Is that true?
2. If that is true, then if I pay for an overclocking service, does that mean that the i9-9900k can be increased beyond 5.0ghz?
3. Also, assuming that it is true, does that mean that the i9-9900 is already at 5.0ghz out of the box?

I was also looking at the i9-9900x ... This looks like a good processor with more cores and memory... but it also seems to be slower in the processing "ghz" - can it be overclocked, or not?...

For a video card: I am looking at the NVIDIA GeForce RTX 2080 Ti - 11GB GDDR6 - ASUS ROG STRIX (VR-Ready)... but I don't know alot about the differences between GPUs... I would be willing to spend up too about another $500, if it meant a much better GPU... but since I have to clue which ones are "better" for VR, I do not know what to look at... Any suggestions with specific technical reasons for the suggestion? (I was told by a friend that the ROG STRIX was a really good one because it has three fans to help cool it)

For the Motherboard: This part has had me tied up in knots... I have been looking at a couple different ones, but the ASUS ROG STRIX Z390-H GAMING -- RGB, Gb LAN, USB 3.1, and 8-Channel HD Audio - is what I am currently eyeballing... I know NOTHING about motherboards... nothing at all... Is this a good board?... Is there a better one for somewhere around the same price-point? (+/- $100.00) There are a few other ROG STRIX Motherboards, but I do not know why any of the others would be "better" than this one...

I'm pretty sure that I do not need a sound card - thanks to motherboard... but what about a network card?... I believe the motherboard comes with lan, but does that mean that I had opt for a networkcard?

Did I miss anything?

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Answer
I'd use the board in the following video.

Why? The reason is in the video.
Watch https://www.youtube.com/watch?v=sCfmM71NOTo

The reason is the slot spacing in case you need to add that second GPU. Folks learn that lesson first hand or by following those that do this a lot. YOUR CHOICE ON HOW TO LEARN THIS LESSON.

No sound card folk. HDMI and more reasons, also https://www.tomshardware.com/reviews/high-end-pc-audio,3733-19.html kicks the idea you get better sound to the gutter. Very upsetting to many but hey, you can ignore that if you wish.

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Answer
Build

I9 9900
2x8GB @ 2666

You don't need a liquid cooler the stock cooler will be fine.

Leave that overclocking stuff for the folks that like pain.

The m.2 ssd should work fine.

After you get the OS installed proper run a benchmark on it.

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