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.
Yes you can run a quad core CPU. And yes you will be able to OC it if you go for a 1:1 ratio:
Q6600:
Multi x Actual FSB, Stated FSB, RAM Speed = Clock Speed
9 x 266Mhz, 1066Mhz, DDR2 533 RAM = 2.4Ghz <== Stock Speeds
9 x 333Mhz, 1333Mhz, DDR2 667 RAM = 3.0Ghz <== Good OC
9 x 400Mhz, 1600Mhz, DDR2 800 RAM = 3.6Ghz <== Excellent OC, About the Max