Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Low density ram chips work with a wider range of motherboards, high densitiy have more chips but work with less.
If you put a high density stick into a board that runs only low density it will show the ram at half of its actual size. (if i remember right its because the ram chips are doubled, could be wrong though)
High density has more chips on it if that helps. For actually identifying what the particular ram is there are lots of hardware ID programs on the net. I really havent used any so good luck there