Hit- wrote So this build is on par with processing power of 3900x.

Hit- wrote What's the difference with i9 9900k is that one just pretty much good for gaming only.

21 wrote

Hit- wrote So this build is on par with processing power of 3900x.

Not really. It depends on the situtation though. The i9-10940x is actually probably closer to 3900x performance, but that's another $100 over the 10920x.
In some situations though, yes the 10920x is pretty close to the 3900x performance wise.

Hit- wrote What's the difference with i9 9900k is that one just pretty much good for gaming only.

The difference with the 9900k is that you lose 4 cores and 8 threads, and sacrifice any sort of upgrade path without a new motherboard.

The 9900k does have better single core performance than a 10920x/10940x and the 3900x, but not hugely better. It's also going to be pretty tough to notice that difference in single core performance @ 1440p144Hz anyway.

Hit- wrote Ok thanks I never built a computer so I dont wanna mess anything up lol or get something wrong.

Hit- wrote I always see people with watercooled is that better. What's good liquid cooler and other stuff you need for it?

21 wrote

Hit- wrote Ok thanks I never built a computer so I dont wanna mess anything up lol or get something wrong.

I would definitely be completely ignoring Intel then, and buying a 3900x.

Hit- wrote I always see people with watercooled is that better. What's good liquid cooler and other stuff you need for it?

Depends what you mean by "better". High end air coolers like the Dark Rock Pro 4 or Noctua NH-D15(S) will perform pretty similarly to a high end AIO CLC like a Corsair H115i or NZXT Kraken X62 for the most part.

I tend to stick with air coolers these days because they have less points of failure, which means it'll last longer. Also, no pumps for air coolers which is another source of noise(the pump on my Kraken X61 was very annoying). An air cooler is going to last pretty much as long as you want it to, with maybe a replacement fan being needed depending on how long you use the cooler for. An AIO on the other hand, has a limited life span, which from my experience is usually around 3 years.

A custom watercooling loop on the other hand, will last as long as you want it to(assuming you keep it maintained, obviously) and has the potential to perform better than either air coolers or AIO's. Again though, more points of failure and added pump noise.

Air coolers are typically considered easier to install as well, but IMO, that depends on which air cooler you're comparing as well as which AIO CLC you're talking about. I've used air coolers that are a nightmare to install. A custom loop is definitely the most difficult though, without a doubt.

If you want an AIO with comparable performance to the DRP4 I recommended, then any 280mm will do the job- so H115i Pro, Kraken X62.

Hit- wrote Ok I'm going to build this. pcpartpicker.com/list/mFzyHB

Hit- wrote Are these all good and compatible right. Really dont wanna spend almost 3grand and also mess up building it. There anyone who can help lol when I receive all the parts

21 wrote

Hit- wrote Ok I'm going to build this. pcpartpicker.com/list/mFzyHB

Be really careful when changing the PSU that's been recommended. It is very easy to buy a sub par PSU. The EVGA G1+ you've chosen, however, is really quite good quality so that'll do fine. That said, 750W is far more than necessary. Even 650W is more than you'll need with a single GPU system.

For RAM, I'd be getting Corsair Vengeance RGB Pro over G.Skill's RGB stuff. I swapped my TridentZ RGB for Vengeance Pro RGB because the Corsair stuff is just nicer.

Here's some 3200MHz kits;
pcpartpicker.com/product/L7qhP6/c...2c3200c16w
pcpartpicker.com/product/27TzK8/c...m2e3200c16

and a 3600MHz kit;
pcpartpicker.com/product/xn848d/c...m2d3600c18

Hit- wrote Are these all good and compatible right. Really dont wanna spend almost 3grand and also mess up building it. There anyone who can help lol when I receive all the parts

Yup, all compatible. If you have any issues, you can post in the PC sections here or just post back in this thread. I'm always happy to help when I have the time, and there are other users who I'm sure would be happy to help you out if I'm unavailable.
That said, this system shouldn't be all that hard to put together tbh and I don't think you'll run into many(if any) problems.