More RAM is generally better, but a lack of it is likely to cause outright crashes rather than strange things like creatures freezing when not looking at them.
I think 3.84 is right btw if you have "4" - manufacturing lingo generally uses the definition of 1 gigabyte = 1000 megabytes, when in practical computing terms 1 gigabyte is actually 1024 megabytes, so that accounts for the "lost" 0.16 gb.
Yeah I can confirm that the trickery of the USB-Stick maker companies is pretty nasty. Instead of giving you 8 GB = 8,388,608 KB (8 GB * 1024 * 1024) they give you 8 000 000 KB (8 x 1000 x 1000).
To explain why 1024 it is basically due to binary. To make it short our PC stores info in 0s and 1s. One of those is called a bit. and 8 bit = 1 Byte. Now each character make out of one Byte. So basically 01001011 is binary for the number 75 and 11111111 = 255 = the maximum value of 1 Byte. If you count 0 too that gives the Byte 256 options of a value. Now since each bit can have 2 different values that basically means 2^8 = 1Bit = 256 options. Now just add more bit and you get to the next closest values / numbers to 1024.
256 * 2 = 512. 512 * 2 =1024.
And that is why in IT it is always calculated from 1024 instead of 1000 and because nearly nobody knows people keep wondering why their 8 GB USB stick cannot actually store a full 8 GB (8.388.608 KB) of files and is basically missing. 21.59 MB of storage. Not very noticable until you get to a TB.
And yes I went WAY too deep with this but it was good to refresh my knowledge too or at least to see how much I had remembered from school.