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.
Depends on what you need, speed or capacity, if your not going to do much gaming or use programs that require extra memory you are better off on a 512mb stick which will run faster but wont have as much space. If you will be gaming or using programs that require more ram than 1gig is what you need. Personaly I would go with the 1gig and I bet plenty of people will agree with me on this one...