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.
Memory clock speed, combined with memory bus width, controls how much memory bandwidth the card has. So yes, generally speaking, higher is better. But it isn't just as simple as that.
There are three clock speeds on a video card that are important: core clock speed, memory clock speed, and shader clock speed. It usually works out that the more you increase one clock speed, the less you can increase the other clock speeds. Which clock speed is most important varies from game to game, but core clock speed usually gets you the most benefit, because in many games, memory bandwidth is not the bottleneck.