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Haswell Overclocking Guide [With Statistics] - Page 1830

post #18291 of 19652
Damn hot vrms, under aida64 on 4.5Ghz 1.190V, 1.900 vccin it gets to 37-39*C tongue.gif
post #18292 of 19652
Quote:
Originally Posted by white owl View Post

Going over 1.4v isn't something I want to do.
I'll have to get a 4790k if I need more CPU power.

If an i5 is a lower binned i7 and I have a less than average i5, I feel buyers remorse. Takes 1.26v (1.24 in BIOS) to get 4.5.
Oh well.
When I built this rig, it was because I wanted to get into PC gaming. I had no idea it would be the overclocking that would hook me.
Hence I ended up with an i5, an average cooler and a stupid PSU. You live and learn. tongue.gif

If I had waited, I'd have an x99 rig. rolleyes.gif

The average Haswell (pre-DC) was ~4.5 @1.3, even more volts for i5's. Yours seems pretty fine!
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post #18293 of 19652
Quote:
Originally Posted by Cyro999 View Post

The average Haswell (pre-DC) was ~4.5 @1.3, even more volts for i5's. Yours seems pretty fine!
I took heed to voltage warning.
Went to 4.7Ghz at 1.270v (BIOS) which is good.
Temps barely dropped though.

Went into BIOS and still had input voltage silly high for 4.8Ghz (1.8v)
Set to 1.65v

62c on my hottest and 58c on my coolest cores.

Same 10 minute pass with Aida was 72c at 4.5Ghz stock so I'm happy with the delid.
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post #18294 of 19652
Quote:
Went into BIOS and still had input voltage silly high for 4.8Ghz (1.8v)
Set to 1.65v

That's not silly high.

Input voltage isn't a voltage on the CPU. It's the way power is supplied TO the CPU. It's not comparable to the other voltages where raising them will directly increase power usage because either the current will stay the same with raised voltage or both the current and the voltage will rise when you set a higher value.

If you're drawing 150w, an input voltage of 1.6 will just transfer 150 watts by doing ~94 amps of 1.6v.

If you do the same with 1.8v input, it's still 150 watts - this time it's 83 amps of 1.8v.

There's nothing to suggest that this is harmful. In the original Haswell CPU's, a healthy gap between voltages and input voltage was even neccesary and you could get bad results in more than 1 way from making the gap between other voltages and input voltage too low. If it's at 1.8v, you should leave it around there and enable a bit of LLC to keep it steady! If it runs at 1.65v that's fine, but you're probably not helping anything.

You call 1.8v input silly high for 1.29vcore (a 0.56 gap) while Intel recommends a 0.6 gap between Input and Vcore and used a ~0.7 gap on their CPU's at stock. The value then was also 1.80v.
Edited by Cyro999 - 10/23/15 at 8:40pm
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post #18295 of 19652
Quote:
Originally Posted by Cyro999 View Post

That's not silly high.

Input voltage isn't a voltage on the CPU. It's the way power is supplied TO the CPU. It's not comparable to the other voltages where raising them will directly increase power usage because either the current will stay the same with raised voltage or both the current and the voltage will rise when you set a higher value.

If you're drawing 150w, an input voltage of 1.6 will just transfer 150 watts by doing ~94 amps of 1.6v.

If you do the same with 1.8v input, it's still 150 watts - this time it's 83 amps of 1.8v.

There's nothing to suggest that this is harmful. In the original Haswell CPU's, a healthy gap between voltages and input voltage was even neccesary and you could get bad results in more than 1 way from making the gap between other voltages and input voltage too low. If it's at 1.8v, you should leave it around there and enable a bit of LLC to keep it steady! If it runs at 1.65v that's fine, but you're probably not helping anything.

You call 1.8v input silly high for 1.29vcore (a 0.56 gap) while Intel recommends a 0.6 gap between Input and Vcore and used a ~0.7 gap on their CPU's at stock. The value then was also 1.80v.
I called it silly high because that's what I needed to get 4.8Ghz stable. Vcore of 1.35ish. When I do a new clock speed, I usually set the multiplier, then I guess at the voltage (educated guess) and set input to 0.5v above vcore.
When I find the correct voltage, I drop input voltage until it is as low as it needs to be.
Am I wrong in doing this?

I have LLC set to 0 (0-125%)

I don't know 100% what LLC does. I know I can get all of my speeds stable with out it but if it helps some how, I'm all ears. smile.gif

Thanks for taking the time...
thumb.gif

I'm going to read the guide again and see what all I missed last time. tongue.gif
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post #18296 of 19652
Quote:
Originally Posted by white owl View Post

I called it silly high because that's what I needed to get 4.8Ghz stable. Vcore of 1.35ish. When I do a new clock speed, I usually set the multiplier, then I guess at the voltage (educated guess) and set input to 0.5v above vcore.
When I find the correct voltage, I drop input voltage until it is as low as it needs to be.
Am I wrong in doing this?

I have LLC set to 0 (0-125%)

I don't know 100% what LLC does. I know I can get all of my speeds stable with out it but if it helps some how, I'm all ears. smile.gif

Thanks for taking the time...
thumb.gif

I'm going to read the guide again and see what all I missed last time. tongue.gif

LLC is compensation for Vdroop.

I guess a better way to phase the question.. Why are you trying to lower input voltage? What is the reward for lowering it or the problem with it being at 1.8? This is one setting that has still not been adequately explained, but it's not a setting that anyone has reported much notable gains from changing at this point, other than "OC works at X setting but not at Y" - Original Haswell seemed to need to raise it to keep around that 0.6 delta over vcore, sometimes higher at high OC - while Devil's Canyon seems to sometimes work with lower input voltage but not higher? Questions, questions and more questions.

I'm just a little confused by people following the standard logic of "lower it til it crashes then put it back up a little bit" with Input voltage, as it's very different to other voltages. From what i know so far, it could actually cause only positive effects to raise it or only negative effects to lower it in some circumstances
Edited by Cyro999 - 10/23/15 at 11:47pm
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post #18297 of 19652
Quote:
Originally Posted by Cyro999 View Post

LLC is compensation for Vdroop.

I guess a better way to phase the question.. Why are you trying to lower input voltage? What is the reward for lowering it or the problem with it being at 1.8? This is one setting that has still not been adequately explained, but it's not a setting that anyone has reported much notable gains from changing at this point, other than "OC works at X setting but not at Y" - Original Haswell seemed to need to raise it to keep around that 0.6 delta over vcore, sometimes higher at high OC - while Devil's Canyon seems to sometimes work with lower input voltage but not higher? Questions, questions and more questions.

I'm just a little confused by people following the standard logic of "lower it til it crashes then put it back up a little bit" with Input voltage, as it's very different to other voltages. From what i know so far, it could actually cause only positive effects to raise it or only negative effects to lower it in some circumstances
I don't know where I picked it up from...

I reset to default.
I'm following the guide step by step.
F@H seems to work alot faster than Aida does.

Thanks. I'll reserve any questions until tomorrow. It will probably take that long. smile.gif
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post #18298 of 19652
Quote:
I don't know where I picked it up from...

It's a fairly common thing (people do it by habit from other voltages) but not justified for input voltage AFAIK biggrin.gif
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post #18299 of 19652
Quote:
Originally Posted by Cyro999 View Post

It's a fairly common thing (people do it by habit from other voltages) but not justified for input voltage AFAIK biggrin.gif

There was a discussion a month or so back on the DC forum about needing lower input voltages (~1.550-1.650v) to get more stable higher end clocks (4.8GHz+) I ended up lowering my input down (1.650v) just to see if I could as I had it at 2.000v before that. It runs fine. There was also discussion of a slightly higher current at lower input voltages, as hwmonitor shows a slightly higher peak wattage at the lower input voltage. This hasn't been confirmed as being a symptom of the motherboards calculation of power formula or a real increase in power usage. Either way, until these chips get a few more years on em, the effects of lowering the input are still hypothetical, as are any issues from having it too high. Please correct me if I'm mistaken.
post #18300 of 19652
Ok. I've been folding since my last post.
4.5Ghz.
In my BIOS i have 1.208. Under load this can bounce up to 1.216-1.232v (HWiNFO).

If I want to sell the chip, what voltage do I tell them it takes for 4.5Ghz?

EDIT:
When I OC my ram later is there anything I need to know?
From 1333 to 1866 my timings change automatically...do the timings need to be fiddled with or does the MOBO know what it is doing?
Edited by white owl - 10/24/15 at 4:43pm
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