Originally Posted by chumgoob
I've had an i5-2500k running at stock since 2011 because I find overclocking really confusing. I've decided to give it a try again with a 4.5Ghz overclock. I'm using an Asus p8z68-V motherboard and this ram
For starters here are my BIOS screenshots. Could someone please check if I've got them right?http://imgur.com/a/8IQ15
If they look right in principle then I'll move on to benching and testing and such.
Internal PLL Overvoltage can be set to Disabled. This can speed up the POST time a little bit. ;)
You may want to set Memory Frequency to DDR3-1600 to match your memory. I'm not sure if this is necessary, but it might be. I don't know.
You may even find that you want to go into the DRAM Timing Control section to manually set the first 5 timings (the "Primary Timings").
You might find that you'd rather use the Manual Voltage instead of Offset because it's possible Manual Mode will be more stable and provide slightly better performance. That's what I found anyway.
If you insist on staying with Offset Mode though, then I'd like to know how you arrived at +0.005V. I mean, is this what someone told you to use? The offset voltage is an offset of the VID, and some CPUs can have very different VIDs (the offset is an added or subtracted voltage to or from the current VID no matter what it is at any given time, but it's calculated after vDroop). More than that, each multiplier and clock speed has its own VID, and again, some CPUs can have very different VIDs. So, +0.005V for one CPU could be very different for another, even at the same clock speed and multiplier on the same model motherboard, etc. The offset voltage isn't something that's the same for all CPUs, even if you had like 50 different 2500Ks. You could have 50 different actual voltages from +0.005V with everything else being the same.
Another thing to look at if you wish to keep Offset Mode enabled is, you will probably need to disable C3 and C6 because having these set to Auto or Enabled usually ends up causing instability while idling or while under light loads. This is because with C3 and C6 on Auto or Enabled, the idling voltage or light loading voltage will go lower than it otherwise would with C3 and C6 disabled. The difference is small, but it's just enough that most people need to disable C3 and C6 when using Offset Mode.
With Manual Mode though, it doesn't matter.
That's all I can see. I hope this helps!