b450 chipset

Hello everyone, I hope you guys are having a great weekend! (If you got one, shoutout to the real weekend warriors): I have quite a situation, on top of an existing HD situation. This is about the HD's first. If this is in the wrong section, please tell me ASAP and I'll move it accordingly...

I have a Gigabyte b450 gaming X and I was wondering what could be this white line around one of the holes for stand offs near the ram ? ( yeah the hole is not in use beacuse my case does not have a space for that one specific hole) https://postimg.cc/rDVpb90s

So I've bought a ryzen 3 3200g for a system I'm building for my girlfriend. I've been on this website numerous times and once posted a thread asking whether a b450 motherboard is necessary compared to a320, as the former tends to be more expensive, and this system is relatively budget based...

I made a list with all the parts that i am going to buy for my new desktop computer. List: CPU AMD Ryzen 7 3700X CPU Cooler Scythe Ninja 5 Motherboard MSI B450 TOMAHAWK MAX Memory (RAM) Corsair DDR4 Vengeance LPX 2x8GB 3200 Storage - SSD ADATA XPG SX8200 Pro NVME 1TB M.2 SSD Video...