RAM? Problems + Boot problems

[GeoHandle]

I've built my own computer and at this point im thoroughly regretting it. I've originally had a problem with my computer not posting if I had a stick of RAM in the third or fourth RAM slot (it would work both in the first two, though it always warned that it wasn't the optimal configuration, and it would also work with either of the sticks alone in either of the first two slots). I thought this was either a problem with the RAM (since it wasn't officially tested on this motherboard), the CPU (specifically the memory controller), or the motherboard itself. I had another single stick of RAM from a different kit that I had the same problems with so I decided to buy a cheaper CPU that was compatible to test with. I tested if the system would work using the different CPU (3200G) and it worked fine (I just couldn't use the full 3733Mhz speed). So I sent the other CPU back and after they (overclockers uk) received and tested it I received a refund. I've now bought another 3700x and I've got the same problem again, along with another problem. I had at one point been unable to set my M.2 SSD as my boot drive (though I could boot from it manually), but this problem went away seemingly on its own. Now it has returned. I would have thought since the RAM problem persisted that it was due to the RAM itself. However, I've had the same problem using a single stick from a different set of RAM as well, and I've now got my m.2 problem with the motherboard. This makes me think it could be the motherboard causing the problem. On the other hand I returned the original 3700x I had and have received a refund, so they obviously agreed that it was the cpu causing the problem I reported. Is it likely I received another 3700x that just happens to have the same defect as the previous one (this one was bought from somewhere else, specifically scan computers)? If not (which I think is likely), what do you think is causing these problems?

The CPU im using: 3700x

The CPU I tested with: 3200G

The Motherboard: MSI MPG X570 Gaming Plus

The RAM: Patriot Viper Steel Series 3733Mhz

The SSD: Sabrent Rocket 500GB

PSU: Corsair RM850X

GPU: 5700xt Sapphire Nitro+ (I just got this after all the problem, so it can't be this).

[The Spectator]

If you having trouble with the CPU, i would see what revision the BIOS is from when they manufactured the motherboard. and if your in windows i believe that you can download the AMD chipset drivers. The BIOS can also affect the ram speed as well (max frequency). it also could be possible that one of your DIMMS on your motherboard could be dead or not functional atm such as, A1 A2 B1 B2 etc. 

 

Good Luck!