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.
At idle they're about the same, the 7750 may even draw a bit less. Under maximum load the 7750 draws a smidge more power but gains about 3x the performance. A bigger issue really is the 6570 is still about 50 -60 bucks cheaper than a 7750, and if "performance doesn't matter" it's a better choice. I run one in my main rig since I don't game often, and when I do it's on a 1280x1024 monitor, so it works fine. Despite the small fan which in the past were kind of annoying, the one on my sapphire card can almost never be heard unless under heavy load in gaming, and then it's rather polite in volume and tone.