Q6600 on P5N-E OC question

I have OC my Q6600 to 3.0 with these setting

0608 BIOS

Vcore 1.33125v
Memory Voltage 2.013v
NB Core Voltage 1.393v
Vcore Offset Voltage [Auto]
FSB - Memory clock mode: Unlinked
[FSB 1333]
[Ram 667]
Memory Timing: 4-4-4-12-1T

I start with Vcore 1.375 and then lower it down. at 1.325v, the system is unstable. The system restarted within 2 minutes running prime95. So I up the Vcore 1 bracket to 1.33125v.

I have ran prime95 for 10 hours, and passed all tests. The only thing that bothers me, is the max temperature is 68C on 2 cores, shown HWMonitor 1.10; and 66C on other 2 cores.

What you guys think about this temperature? I am using a Rosewill RCX-Z4 CPU Cooler, in a Nine Hundred case. The 200mm Bigboy fan on the top is not working at the moment. The fan blade is hitting the case, so I unplugged the fan. I don't know how to take the fan out and reposition it :/ I ordered another 120mm fan to install on the side vent, but I am not sure if it will help the CPU.
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More about q6600 question
  1. I like the 1T timings... Anyway, Those temps are safe for a "GO" stepping chip, but I wouldn't go much further without better cooling. Here's link to a very good temperature guide, I recommend a good read through, the author knows his ****.

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