i5-2500K - VID, Vcore - some doubts.

[Mussels]

and without knowing the exact methods your BIOS uses, we cant really tell you what each setting controls, either - so its a waste of time to fuss over it. Just pick one method to control the voltage, stick with it, and overclock as high as you can with as little voltage as possible.

 

[BambOOs]

Ok finally:

1. Why VID increases with increase of multiplier?
2. Should I just ignore VID values after OC and focus on Vcore in CPU-Z/BIOS?

I want to thank you all so much. I really appreciate your help.

 

[Mussels]

1. Past stock clock (and turbo) speeds, it shouldnt. Its part of a power saving feature that drops voltages + multiplier at idle - not raising them up for OCing.
2. Yes.

 

[BambOOs]

According to this guide by Asus (but it looks similar on other boards):

http://rog.asus.com/51092012/overclocking/overclocking-using-offset-mode-for-cpu-core-voltage/

If we increase multiplier, then mobo will increase voltage by itself.

" the CPU voltage will be offset from stock voltage automatically – as you increase operating freqeuncy, the default voltage
will automatically increase. In order to find out what the new load voltage is, we can boot Windows and run a stress test, while keeping ROG CPU-Z open to get a rough
idea of how much voltage the processor is seeing under load"

So it looks like I will have to use negative offset value

I'm going to determine lowest stable voltage @ 4.5 GHz in Fixed Mode at first.

 

[Flow]

Yes, that is correct.
I had 2 asus boards for my 2600k, blew the first one in a bios update, the second one is a different type but runs and acts the same.
Don't know about LLC though on your board, on asus boards they are fine at default settings, on other brands it could be you need to adjust it.

Now, I get a core voltage reading in cpuz, and a vid reading in realtemp.
I use and always have used the cpuz reading. The vid reading in realtemp shows 1.366v when stressing, while cpuz shows me 1.295v in prime small fft's and 1.320 in blend or gaming.
So disregard the whole vid thing. Cpuz is wat works and always have worked, as a short way if not able to meassure real voltage.

You can start with 1.300v for 4,5Ghz. Keep in mind though, some 2500k's need 1.350v
The most work will be in getting it with offset.
Goodluck.

 

[Mussels]

if you use a static voltage instead of auto, it shouldnt increase and you can ignore the offset. a negative offset will make your system potentially unstable at idle clocks.

 

[BambOOs]

SVID = static voltage ID = manual/fixed mode
DVID = dynamic voltage ID = dynamic voltage/offset mode

Right?

 

[Flow]

?

Just set your vcore manual.
And set your ram at the proper frequency, timings plus voltage.
The rest on auto should do the trick.
You need to adjust LLC and PLL overvoltage for higher clocks, like 4,8Ghz and higher.

If you want to overclock a sandy, you need to start at the beginning, and that's with most settings at auto.
So it's not important to know what you are asking.

So with everything at auto you start with setting ram manually, the frequency, the voltage and the first four timings, the other timings left as they are already set by your bios.

Then you adjust the multiplier to 45 for all cores.

Then you set your vcore at 1.300v.

Safe , reboot and test with prime95, cpuz and realtemp.
Your temps should ideally be under 75°C when running small fft's in prime.
Watch cpuz for your voltage, with a proper psu and motherboard it should show 1.300v if set in bios.
After 1 hour running, it's pretty stable although many will say you need to run it much longer.
Then you can run blend, also for an hour.
Both tests will fail sooner or later if not stable.

Finally, if you think you are there, let it run for 3 or more hours, could be it crashes when around 3 hours running. (had this myself one time).

Now when you want to go higher, then your questions become more important. But in general sandy's will run 4,5Ghz easy with only multiplier and correct voltage.

ps. offset is used to let the cpu throttle down to 1600Mhz when idle or doing simple tasks in desktop mode.
I use it for over 5 years now, but it's debatable if it's better, or to just set a static vcore, something I ran my E8400 with for some 4 years, without any issue.
Your cpu wont run much hotter when idle at a fixed vcore.
Anyway, it's always good to have choices and options.
Goodluck.

ps2.

vid was lower on my p8p67 board, but still, on this p8z board it's already running solid for over 3 years and 5 years altogheter now.
Don't worry about vid.
Also, it runs a bit cooler on windows 10. Same software as shown.

Needed close to 1.400v for 4,8Ghz. And temps where nearing 90°C. Saw this already with the stock cooler reaching 95°C and throttling. So I don't have a 5Ghz chip, although it could reach it with proper settings and cooling. But it would degrade pretty fast also.

Hmm, it's with HT on. HT off would run cooler, allowing higher overclocks. But I prefer HT on, because that's why I got it in the first place.