Well, I defiantly have a range of
FSB frequencies at which I can't boot (From 3.52GHz to 3.67Ghz to be exact), and I can boot from 3.68GHz to 3.92GHz. But sadly no matter what I tried I couldn’t get any of those frequencies to be stable for me.
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Did you try
"Looking back on my settings I used (G)MCH OverVoltage Control +0.175v almost always, certainly on 9x400 , so upping that might help as well ??"
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Yes I tried this and every other possible thing I could think of to try and get Stable anywhere between 2.68 to 3.92GHz.
Sadly nothing I tired worked. I first backed off the memory settings and dropped the memory multiplier to near stock memory speeds.
I then tried upping the vCore one step at a time all the way from 1.4v to 1.5v. While doing this I tried every combination of
FSB OverVoltage as well.
I even tried dropping the
CPU Clock Ratio to 8 and upping the
fsb. Again tried every combination of vcore from 1.4 to 1.5 and
FSB OverVoltage. And while it would boot fine It still wouldn’t stabilise.
One thing I did notice ... when I had the vcore relatively low (1.41 it would fail almost immediately (hard reboot) when I started the prime small fft test on even one core. as I raised the vcore it wouldn’t hard reboot till the test was running on 2 cores, by the time I got to vCore 1.5V it would hard reboot after starting the test on 4 cores. So I’m guessing that the needed vCore to get it stable on 3.68GHz or above will require a vCore of greater than 1.5v, which I realy dont think I will be trying till I can afford to go water cooling or better sadly.
Oh well least I discovered a few more nuances about my system
hehe
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Btw what are you running " 6 x Samsung 500GB SATA II, 2 x 400GB SATA II" off out of interest ?? , your not short on storage
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hahaha, well as I think I mentioned earlier, the main things I use my system for is Video editing and a little gaming. At the moment I have 6 full dvd projects that I'm working on, and you'd be amazed how much hundreds of hours of DV video content takes in HDD space. Not to mention the all the huffyuv-2.1.1 encoded preview files etc. So actually I am constantly scrounging for hdd space and cursing at the transfer speeds across my gigabit network when doing backups
hehe.
I will probably go terabyte drives soon, but $/GB the 500's are still WAY cheaper.
Cosmic.
owe you 
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