Hello everyone, hope you're all doing nice and good.
As the title says I'd like to undervolt my 4790K because I find 1.265v to keep an auto 4.4GHz on all four cores a bit too much. I've been looking around at guides but they all say "do this" "do that" without any explaination. I'd like to know what's the difference between offset and adaptive for the CPU voltage for exaple and so on. So if you have a guide to link me or you'd like to coach me through this process that would be awesome! Thanks (:
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Depends on your board. But you should just
Step 1: lower the voltage
Step 2: run OCCT (or other CPU benchmark)
Step 3: if it is stable repeat step one and two till unstable....then go back one step in voltage
for a more in depth guide I can help if I get your mobo model.
Adaptive:
Basically allows the voltage to go up and down with the clock speed and load.
On new systems its a lot better than old ones.
And 1.265 volts should be more than ok as long as the temps are reasonable btw
I mean if you really want to tweak it you can to see what the lowest stable volts are
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That's the part that I want to get details about.
MoBo is a Maximus VII Hero
@Cavemanthe0ne I've seen kind of same explaination but I've also read that adaptive can damage CPUs while stresstesting. Why not use offset mode than?
The last OCCT test said that my temps where around 65°C with some spikes in the 70's. If I still have the graphs results I can post them.
adaptive can damage cpus if it puts too much voltage through the thing
as it is usually very... uncontrollable
now, the offset
that is a whole different thing
and there are many offsets, which specific one do you mean
I guessed it was a ROG board (same terms as mine so it will be easier for me)
Just play with the offset number, I think the board goes down to a minimum of 1.000volt I would start about 1.2 then go down by pressing the - key once saving the BIOS then running OCCT and keep doing that. This will help keep your temps lower then what you were at before, even though what you were at before was perfectly fine.
The problem with doing adaptive is more when dealing with OCing a CPU since you are trying to push the silicone beyond spec the drop in voltage that adaptive mode uses can cause instability.
In the grand scheme of things the power savings you get from adaptive vs. offset is literal cents.
keep it simple and use the offset voltage number when overclocking or undervolting. Adaptive mode is fine for if you just want to plug it in and go.
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I know there are two offset + and -. I'm talking about the + offset. I've seen somewhere a random guy changing just the CPU voltage from auto to offset + and leaving everything the same. And with my identical CPU and MoBo got less volts going into the CPU. How's that even possible?
So, your suggestion is to put the voltage to offset + and set just a maximum voltage right?
Than go for testing over and over again.
P.S. would this practice be safe even if I decide in the future to bump up those clocks?
In this case, Intel knows the 1.26 volts will run all 4790k CPUs even though some might be able to run at much lower voltage, same logic as overclocking, Intel knows that all 4790ks can run at 4.4GhZ even though some can run at a higher frequency.
This phenomenon is known as the Silicon Lottery, you will need to find out what voltage your processor can do 4.4GhZ at. You might be screwed and you need the stock voltage, and not have any head room to OC, or you will have an amazing chip that can go nuts on low voltage, but you will not know until you start messing around with it. Plan for hours to figure out the optimum everything
I believe you would want to set both min and max to the same. (so the voltage stays constant)
When or if you bump the clocks you will want to go back to 1.26V. Since the point of undervolting is to get the least amount of power to the CPU at the clock speed you are currently at.
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Min voltage? I don't have such option in the UEFI.
Well then don't worry about Min, I have a Formula so I might have a few more options then a Hero.
I'm not home so I can't get into the UEFI to check. I've downloaded the manual on a pinch to check and I didn't see that option. What tab is in it?
Looks like you don't. You would change the CPU voltage mode to manual mode, then then change the CPU core voltage override. The rest of them you can leave in auto.
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I've read on the manual that CPU override voltage is for the "uncore" which I don't have a clue what it is and it's never mentioned in any overclocking guide.
Uncore is an old term from back in the day. And it does look like you would change just the CPU core voltage.
here is a video that I used to look into the BIOS options with out rebooting my system
BIOS video
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Man, I love you for all the help you gave me. Thank you so much.
No problem dood! Let me know how low you get.
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