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.
Well, the cache is on-die so its running at the same speed as the core itself. The more you O/C the faster it goes
as for the original question, Maybe around 2.5Ghz or around, in reality an overclocked PC is generally faster than a stock one runing at the same clock speed, because of the extra memory bandwidth the overclocked one has.