Safe voltages and temps 3770K?

Latest version of cpu-z?

Hi Have you enabled any LLC in the BIOS? (Load Line Calibration) When a large power draw is put on the CPU it will drop down the volts under load, thats why you are seeing the difference. LLC counters this by the MOBO pushing more Voltage through to keep it at the level you have designated in the BIOS.

However, as Vdroop is designed in by Intel, many people including myself are a bit nervous about using high levels of LLC as there was an article on another site Anandtech that, basically stated that LLC may cause damage to the CPU over time. Although lots of people tend to just ignore this, many say they have used it for years and had no problems, I err on the side of caution and just use the lowest level. (There's no consensus on this at all some are for and some against).

If you find you are stable without using LLC (it will also spike your temps a bit) I would just leave it as it is

LLC is off by default, so if you haven't enabled it, it wont be on. The setting will be for 25%/50%.... or level 1/2/3.... On my Asus board its medium/high/ultra high/extreme. What it allows is for your idle and partial load voltage to be lower because it lowers the amount of droop.

Say your chip needed 1.2 v to be stable at 4.5 ghz for example. With 100% LLC it would remove ALL vdroop so you could manually set the voltage to 1.2 no problem, and it would be stable. Without LLC you would have to set the voltage to 1.24, for example because when the IBT/Prime load came on the Vcore would drop from 1.24 to say around 1.2.

The only way to see how much droop you get is by watching the voltage in CPUZ while Prime/IBT is running. I tend to write down all my settings and voltages under different conditions (Idle V, Load V, offset amount, temps, CPU PLL everything all settings) and make tables for reference.

If your CPU is stable under IBT maximum 20+ passes and also Prime Blend for 12 hours, its unlikely that any game will bother it, I'm sure there are instances where problems have occured but most should be ok and if theres a crash due to the o/c sometime just add a tiny bit more Vcore, and retest Prime 95 blend.

Your temps look ok, I like to keep things under 85 in IBT and 75 in prime (70 is better but hey) again this is a matter or personal preference, some people are happy to go up to 90c, as there no real life situation when the cpu will ever generate as much heat as IBT does.

I would also suggest working in an offset once you know the lowest Vcore that you are stable at, turning on the auto V and adjusting to + or even possibly - from the auto voltages, it just allows for a bit of power saving when your chip is dropping down, and once you know the Voltage needed it just takes a bit of time to work out the offset required, its easy and may lower your idle temps, and less heat is always good.

Read some Ivy Bridge overclocking guides online, also look for Youtube videos with your mobo to give you an idea, its fairly easy but its always good to know for yourself the settings in your BIOS and exactly what they do and why you are changing them, that way you can get the perfect overclock settings for your particular setup and it will be stable and as cool running as you can make it for years to come. Google is your friend.

Good Luck ! (Btw I wish I had your chip if its stable at that Vcore. Mine needs 1.2 for 4.2 ghz )