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.
Not sure I understand the question. It will work with any CPU, what's important is can the power supply support the card and can it physically fit in the case. If you have an i5 you should have the proper PCI-e slot on the motherboard.
The only issue you'd have with a CPU would be putting a low end CPU with a high-end GPU. The CPU couldn't keep up and the card would not work to its full potential.