Hardware Combination HELP
Hi from a fellow Romanian.
You probably mean B520 motherboard, or A320 motherboard ... B420 doesn't exist.
edit : just read your post a second time, and I see now you already have the CPU + motherboard.. weird how you don't have ram from old pc in that case... or cpu cooler. the paragraph below was written assuming you want to buy cpu and motherboard.
If A320, I recommend NOT buying one, because you wouldn't be able to upgrade to Ryzen 5xxx processors in the future. Also, they usually have no heatsinks or basic heatsinks on vrm, so forget about overclocking or good support for 8+ core processors, and there's only 2 slots of ram, and minimal usb connectors..
If B520, double check that Ryzen 2400 is supported... I'm not sure it is. I think only Ryzen 3xxx and 5xxx are supported on B520 / B550 chipset
2400g has integrated graphics and because of this, there's only 8 pci-e lanes for video cards, besides the 4 pci-e lanes going to the m.2 connector.
This means that any video card you'll put in the slot, it will run at most at pci-e x8 so there will be a tiny loss of performance (maybe less than 1%)
Since you'll buy a separate video card, maybe consider getting a Ryzen 1600 AF or 2600 (six core , twelve threads) because then you'll have more performance and 16 pci-e lanes for video cards.
RAM... Ryzen processors really like higher frequencies... ideally aim for 3600 mhz, but 3200 should still be fine. There is a small performance bump from 3000 to 3200, but less of a jump from 3200 to 3600. if your budget is tight, you can go for just one stick, work with less performance due to single chanel mode, and then buy a second stick when you have more cash. Dual channel mode does help and gives you a performance boost, but if money is tight, you can live with just a stick for a short period.
For example, you'd be better off spending those 20-25$ (a 8 gb stick) on a better motherboard and suffer for 1-2 months with a single 8 GB stick until you find 20-25$ to buy a 2nd stick. There's nothing special about ram sticks sold as a dual channel kit, you can buy individual sticks.
You DO NOT need a 700w power supply ... it's ok if you already have one but otherwise it's really not needed... the processor consumes maybe 60-80w, the video card maybe 100 watts, the motherboard and everything else around 20-30 watts.
Even with a video card that consumes 200-250 watts, your whole computer will still consume less than 400w, so even a 500-550w psu will be plenty.
A GOOD 550w power supply should work up to a RTX 3070 ( a bit borderline, but doable) ...
Not sure if you can get 60fps in all those games with 1650, which is around 5-15% weaker than a RX 570 video card from AMD (though the AMD card consumes more power, something like 180 watts compared to 70-80 watts or so)
You can see a review here and a comparison with other video cards : https://www.techpowerup.com/review/msi-geforce-gtx-1650-gaming-x/27.html
By the way, if you don't have the card already and you plan to buy a used one, I happen to have a RX 570 4 GB I don't use, so if interested send me a private message and maybe we can work out something.

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