thanx for ur replay ... but i need to know what GPU models to use ... and what is best and what to coin ETH or XMR ? or z cash ?
Visit
https://whattomine.com and do a comparison yourself
this website need to know the GPU hash rate how to know my GPU hash rate while i did not buy it yet
and don't know what to buy nvidia or radeon and what ram for card's and which of them best ( msi or gigabyte or evga or asus ) i need to know all this thinks to start working
You're going about this all wrong in my opinion. Start off small, but start RIGHT NOW. Buy just one card and have it sent to you ASAP. If you have a basic PC mine on that first.
The fact that you're even considering an I7 CPU or 32GB of RAM (the wrong type as well) means you're jumping without looking where you're jumping to... this only leads to errors that will make you regret starting.
Start now with a simple but modern card - any brand of GTX 1050, GTX 1060, RX 560, RX 580 is fine for learning. These cards all have tons of guides out there and even some youtube videos that can hold your hand on how to build a whole rig. Once you understand how to mining, difficulty, pools, latency, wallets all work then jump in if you're stilll up to it.
If you want to make 2-3k per month you're looking at spending at least 20K right now factoring in future difficulty jumps and no price increase.
I've been mining since 2011 and I have sold off most of my cards in the last 3 months for insane prices and bought an insane amount of crypto compared to what I would be able to mine. I'll buy used cards in bulk when the next crash finally sets in. I might be wrong but I think getting in now is a mistake, except for maybe learning with 1 card or 2.