- Intel® Core™2 Quad Q6700
- Asus P5Q Deluxe
- 8GB DDR2 OCZ Gold 8500 @ 960MHz - 5-6-6-18 - 2.1V
- NB voltage = 1.44 paired
If I set my FSB to anything above 300 (e.g. 400 X 7.0 multiplier) my system would randomly reboot itself. However if I use 300 x 10.0 multiplier it is completely stable.
Hello nayan89,
the simple answer is through a combination of the chip you are using, fours sticks of RAM and manually setting your vNB the Intel® P45 northbridge chip (NBcc) is spazzing out!
If you want to just keep things simple for the moment and get to a safe plateu I would suggest you reset the BIOS so the board sets things back to [Auto] and for a simple 3.30GHz Overclock . . . you should be able to achieve this with "minimal" effort just by adjust the FSB from 266MHz up to 333MHz, setting the memory frequency to approx DDR2-1066 and then simple adding vCore if the [Auto] setting doesn't give the chip enough juice!
To break this clock up into two stages I would try for 3.30GHz with the memory at DDR2-800 leaving you to just work on the vCore . . . then once the CPU clock is sorted I would then switch up the ram from DDR2-800 to DDR2-1066
Intel® Core™2 Quad Q6700 @3.3GHz
- 333 x 10 = 3330MHz
- 400MHz (DDR2-800) [5:6]
Intel® Core™2 Quad Q6700 @3.3GHz
- 333 x 10 = 3330MHz
- 533MHz (DDR2-1066) [5:8]
Ok so that's the easiest route forward for you atm . . . if you get that cracked then perhaps we can push further . . .
[Advanced User Info]
Nortbridge Core Clock (NBcc)
Now the reason you were running into problems when messing with the CPU Multi and cranking the FSB is due to a little known subject . . . the NBcc
The NBcc is the core clock of the nortbridge and is the thing that generates the FSB . . . when you changed the "Native" multiplier downwards you actually increase the NBcc . . . not many people know or understand this but for the simplest clocks leave the CPU multi at its "Native" setting . . .
The mathmatics for working out your NBcc speed is as follows
- [Native] CPU Multiplier Divided by [Set] CPU Multiplier Multiplied by [FSB]
For the easy clock suggested above the NBcc maths is easy
10/10x333= 333MHz
Now look what happens when you manually lower the CPU multipler and crack the FSB right up as you mentioned in the O.P
10/7x400=571MHz
Even though you will only see 400MHz-FSB displayed in CPU-z the NBcc will be running at 571MHz which along with a full bank of RAMs and the vNB set to manual will flop . . .
If you don't understand the NBcc maths then leave the CPU multiplier at its native . . . if anyone doesn't understand the NBcc maths then do not advise people to lower there CPU multiplier until you understand the impact this has on the Northbridge!
Sorry for the long post but hopefully you and others may find this info useful!
