specsnerd007 :
okay so what if I want to put
G.SKILL Trident Z RGB Series DDR4 Memory Module (8GB X 2pcs, 3200Mhz)
it has RGB I hope it won't take much power. other than that I think I'll buy all the things you posted including the ssd because I'm planing to have one. Also why is EVGA SuperNOVA 750B1 750W ATX12V Power Supply cheaper than 550W psu that you posted. Thanks
Ryzen motherboards, being relatively new, is fairly picky in terms of RAM compatibility. It is advisable to check the actual motherboard's QVL in so far as the Ryzen RAM compatibility is concerned, as they have been tested to work with such motherboard. Though some RAMs not listed in the QVL (including those G.Skill Trident Z RGB versions)
may work, it's a hit-or-miss thing as of this moment - so, it's a risk you will have to take.
The EVGA SuperNOVA 750 B1 (p/n: 110-B1-0750-VR) is a lower-tiered PSU (i.e., lower quality) compared to the G2 or G3 Series. The 750 B1 (or NEX750B) is made by FSP, is semi/hybrid-modular, rated 80+ Bronze efficiency, and has 5-year warranty. It has mediocre voltage regulation, high ripple and poorly-reviewed . It was based on the FSP's Raider PSU platform - which, in itself, is a big step down from their own better-quality Aurum platform series.
On the other hand, the SuperNOVA G3 series is one of the best PSUs in the market today. This series is made by Super Flower (one of the best OEMs as far as power supplies are concerned). It is fully-modular, rated 80+ Gold efficiency, and has 7-year warranty. The G3 (as well as the G2 series) are highly-reviewed for its voltage regulation, protection, ripple, and over-all built quality. It was based on the Super Flower's Leadex II Gold platform - a top-of-the-line PSU platform.
Hence, the SuperNOVA 750 B1 is cheaper than the SuperNOVA 550 G3 or G2.