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.
Your RAM is at 866MHz so I presume your still trying 433MHz FSB? You need to get back to a stable clock speed and work from there slowly building up the speed. As your using 800MHz RAM (PC2-6400) (I do too) you will be limited to a 1:1 strap at higher FSB speeds.
You mentioned you were hitting a wall at 3.6GHz, its best to try and build from there. Were you trying a 433 FSB with a 9x multiplier (3.9GHz)? Thats a big ask even on water. I can reach 3.9GHz but its too hot for my loop to handle under load.
If I push any further I also get video signal loss...
Nice to see some good Q6600 overclocking is going on!
I'm running a GO Q6600 on a single loop using an EK Supreme Plexi and single 120mm rad with push pull fans.
I run 2.4Ghz day to day, but can get up to 3.8GHz stable and 3.9GHz not so stable (crashes during stress testing) can get closer...