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How undervolt a 980x?

post #1 of 18
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I am trying something different. Instead of overclocking my CPU by starting where it's at and working up, want to find out the lowest voltage the CPU will run stable at 3.33GHz. Is all I need to do is lower the CPU Voltage in the BIOS and run Prime95 small FFT to verify stability until it crashes and then know my baseline or is there other voltage settings that need to be lowered?

CPU: Intel 980x
Motherboard: Asus Rampage III Extreme
Memory: SuperTalent DDR3-2000 7-7-7-20

Thanks.

JR
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post #2 of 18
I usually try to lower all of my voltage settings to see what my minimum is, but undervolts only really require you to lower the CPU voltage.

Depending on your cpu cooler and ambient temps, you may see your voltage around 1.2, possibly lower, with 100% stability.
    
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by Jaguarbamf View Post
I usually try to lower all of my voltage settings to see what my minimum is, but undervolts only really require you to lower the CPU voltage.

Depending on your cpu cooler and ambient temps, you may see your voltage around 1.2, possibly lower, with 100% stability.
Thanks for the reply. I know what little tutorials there are out there on overclocking in general on the 980x, they basically say to just mess with the cpu multiplier and cpu voltage. There are a lot of other voltage settings but doesn't seem like most people mess with them. Since overclocking the i7 is new to me, especially this unlocked one, was hoping for a really in depth guide but haven't found one. All of them talk about pieces of the puzzle but not the whole process. Some talk about the i7 overclocking but say to throw it all out with the 980x as it's simpler for the above two settings reason, no one talks much or at all about memory settings or voltages. And especially what in the bios to disable to make sure the system doesn't get a mind of it's own and control things. I know the basics that are still the same as before, but like I mentioned, there are a lot more settings. Think I got most of it, but always nice to have a skilled review.

JR
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post #4 of 18
Not all guides are accurate since the motherboard and ram along with MANY other variables can change how well you can overclock. Your batch number is probably the largest factor in that.

As much as people would love to do tons of 980x reviews, they're just a tad pricey for some of the reviewers.
    
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post #5 of 18
2000MHz 7-7-7-20
post #6 of 18
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Quote:
Originally Posted by ellisbodds View Post
2000MHz 7-7-7-20
That's how I role!!
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post #7 of 18
Quote:
Originally Posted by jriker1 View Post
That's how I role!!
Man, I'd like to role that way too - my DDR3 is at 1333MHz 7-7-7-20

Anyway, I would have thought that for undervolting you would effectively follow the same procedure as overclocking. Lower the CPU voltage a little, check it boots into Windows, perform stress test/s of choice, lower voltage some more, repeat.

And so on.
post #8 of 18
Thread Starter 
Quote:
Originally Posted by ellisbodds View Post
Man, I'd like to role that way too - my DDR3 is at 1333MHz 7-7-7-20

Anyway, I would have thought that for undervolting you would effectively follow the same procedure as overclocking. Lower the CPU voltage a little, check it boots into Windows, perform stress test/s of choice, lower voltage some more, repeat.

And so on.
Thanks. That's what I figured, but with some many voltage settings and the fact that you usually tweak more than the main cpu voltage on a non 980x hard to think you would leave everything else at default but guess that's how it works.

Even like the UNCore. What I read they talk a lot about tweaking that a bit for slightly more stable memory on the i7 but don't mention it at all on the 980x.

JR
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post #9 of 18
Overclocking a 980x is pretty much the same as overclocking any i7, but being a 32nm you will want to go a bit easier on the cpu & qpi/vtt voltages. The unlocked multipler makes it easier, I generally set my memory to the 2:10 or 2:12 multi then up the bclk to where I want my memory running & use the cpu multiplier to get my cpu frequency.
Since the multi is unlocked it is better to turn off turbo so you can see that what you set in BIOS is what you get in windows.
Can't help too much with undervolting, never experimented with it on the 980x.
    
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post #10 of 18
If you undervolt all you should undervolt is the core. And if your memory is running that fast and tight your QPI is probably way too high(if it is set on auto). Also if you are using XMP it is probably too high as well.

You should stablize that first and then work on your undervolt.
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