Basic overclocking steps with E6400/680i mobo

2

2004raptor

Limp Gawd
Joined
Oct 21, 2006
Messages
178
Trying to research overclocking. I know I need to change the FSB and the vcore.

In the BIOS the FSB Memory Clock Mode is Auto.
Should it be Linked or Unlinked?

FSB Memory Ratio is Auto.
Should it be 1:1, 5:4, 3:2, Sync Mode?

Any changes to Memory Timing Levels?

What is the vcore under and what should I change it to?

Any thing else I should change?

thanks

E6400, eVGA 680i, 2GB Crucial 10th Anniversary, eVGA 7950GT KO Superclocked, Tuniq Tower, Corsair 620 watt, Thermaltake Tsunami.
 
FSB memory ratio should be 1:1 if you plan on going over 400FSB... Hell, it should be 1:1 at any level of overclocking :)

FSB memory clock can be either linked or unlinked... For simplicity's sake I'd suggest linked. (change to unlinked if your FSB is going over 450 or so)

Memory Level Timings... You shouldn't need to change any of these unless your motherboard is using the wrong timings for your RAM. YOu can change each option here to what your RAM spec sheet says (usually 4-4-4-12, 4-5-4-15 or 5-5-5-15)

Make sure you LOCK your PCI bus at 33mhz and your PCIe bus at 100mhz (or 101 mhz if you're getting any graphic related wierdness)
 
The 680i has the ability to totally unlink memory speed and fsb. So, you can just dial in the memory speed and the fsb speed (affects CPU) that you want without worrying about 1:1 or any other ratios. Initial investigation shows that there is no performance penalty to "de-linking" them.

So, to overclock the CPU. . .

System Clocks Menu:
Set all the PCI-E slots to 100
Set the SPP <-> MCP Ref Clock to 200
I haven't yet found a way to lock the PCI bus to 33MHz. I suspect it's done automatically.

FSB & Memory Config Menu:
Set 'Memory Clock Mode' to: Unlinked
Set FSB to the desired level (1400 gives me 3.15GHz. . . haven't tested stability)
Leave the Memory where it is at 800.
Memory Timings: Have yet to mess around with these. I do these last.

System Voltages Menu:
ALERT! You should definitely take your 'CPU Core' voltage off "auto" and set it manually! When set to "auto," the motherboard will dynamically set your vcore according to the overclock you've selected. I found that for my 3.15GHz overclock, it had raised the vcore to around 1.35v. This was causing my temps to get into the high 60s under load. Once I set this manually (to 1.25v), my temps now stay in the mid 40s under full load. So. . . do not leave your CPU Core voltage set to "auto!"

That should get you started with the CPU. I'm just getting started myself. So, I can't be of much help with anything else!
 
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