There isn't much difference if you're going to pair it with the 8700k but if you're in the market to buy the 9th gen series then definitely go for the z390 as the price difference isn't much with z370 ...

HP Omen and Dell Alienware have some pretty good deals under $2000 that will last you long enough. Also you can buy 1440p higher refresh rate monitor for smooth gameplay

Try booting with 1 ram stick and without the hard drive. See if you get a post

8Gb ram is not something I would recommend even in single monitor setup because some games require more than that. For instance, back when Forza Horizon 3 was released I couldn't max out the game on 8 ...

4k gaming is not cheap and will require you latest and greatest graphics card but its not useless IMO. Some people prefer high resolution over higher refresh rate. It all comes down what you actually ...