I hope this helps! (I don't have a 680i based board though!)
To get your CPU / Memory clocks, you need to goto the "Extreme Tweaker" menu.
FSB - Memory Clock Mode = This can be "Linked", "Unlinked" or "Sync" - If you choose Linked or Sync, the memory speed increases as you raise the FSB. "Unlinked" allows you to set the memory speed independent of memory speed.
FSB = FSB (QDR), MHz - by default this is @ 1333 with your CPU (Devide by 4 to get real value) - Increase this to OC your CPU ;)
Mem DDR, MHz - This is where you set your RAM speed when you set to "Unlinked" or allows you to change the "memory divider" when not using "Unlinked mode"
You then need to goto the "Overclcoker" sub-menu
Here you can change/lower to CPU multi (useful if you want high RAM speed)
Memory Timing Section --> This is where you set the various timings. Starting off, you're best to only change to main 5 timings and leave the rest on auto (be aware that this board uses very tight sub-timingsby default, so you might need to increase them for high memory clocks) - you can download a tool called "Memset" to see what timings the board uses when set to auto, then use this as a starting point when tweaking the ram.
Spread Spectrum Control => Disable everything in here if you're overclocking.
"Spread Spectrum" allows the board to alternate the signals to reduce EMI, but this hinders your overclcoking alot!
CPU Internal Control --> This can be left enabled - helps lower heat
Limit CPUID Max val - Set to "Disabled" if using XP!
Enhanced C1 (C1E) - Disable when overclocking - it lowers the cpu multi when idle to lower heat - can try re-enable after you find a stable OC
Disable Execute Bit - Leave this enabled = Stops some types of viri and poorly coded software from crashing your pc.
Virtualisation Tech - "VT" - leave enabled - this allows you to run a 64bit vmware OS inside a 32bit host OS
Enhanced Intel Speedstep tech - Disable if overclocking ---> allows the CPU to lower voltage when idle (lower voltage when OC'ed crashes the PC)
LDT Frequency - 5x is default - set to 4x or 3x when overclocking! - This is the link speed between components and the chipset, when you overclock the cpu FSB this also increases. Choosing a lower multi helps keep things stable.
You've also got the "Over Voltage" sub menu
Vcore voltage = this is your CPU voltage - ~1.5v should be your max on air cooling. You'll know when you've reached the limit as your temps will be through the roof ;)
Memory Voltage - if you have memory based on micron D9 IC's, then 2.3v should be your max for 24/7 use, but use a fan - default is 1.8v
1.2v HT Voltage - this is the voltae required for the HT link. Increase this to get higher FSB clocks. This is a sensitive voltage and not all setups work well with this maxed out. Some work better with 1.3v instead of something higher.
NB Core Voltage - Chipset voltage - need to increase this when increasing the FSB and you hit a wall. Watch the chipset temps though as the 680i chip runs hot already!
SB Core Voltage - Some find increasing this helps with high OC's. I've never had to increase it on an intel chip, but you might have to with nvidia
CPU VTT Voltage - this is the reference voltage for the CPU. By default it's set to 1/2 the vcore voltage. When you have hit wall and adding more vcore doesn't help, start increasing this. Vcore is more dangerous than VTT so you are ok to "play" with this setting. increasing too much or having this set too low will cause reboots.
DDR2 Controller ref voltage - increase or decrease this to help high fsb overclcoks - each board responds differently!
DDR2 Channel A Ref voltage -
DDR2 Channel B Ref voltage - both of these are like the cpu VTT voltage for each DIMM slot. You can fine tweak the memory supply to each slot to help with high ram clocks!
This is everything I can think of, unless you want to send me a 680i based board I won't know what other options it has
Ken
