Haswell overclocking tips plz?

mistersprinkles

mistersprinkles

mistersprinkles

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I'm ready to overclock my 4790K... mainly out of boredom. I have experience overclocking many other CPUs, but I have no Haswell OC experience, and I know that to get optimal OC you need to tweak more than multiplier and voltage settings.

Can anyone recommend a good Haswell OC guide as well as tell me what people are using for voltage and temperature monitoring as well as stress testing for stability these days?

I remember that there was a version of P95 or two that were no good for Haswell as they stressed AVX and that overheated the chip. has that been resolved? is there something better than P95 out there now?

Thanks folks.
 
http://www.overclock.net/t/1411077/haswell-overclocking-guide-with-statistics

They always have great guides on there, realbench is good for stress testing and HWinfo64 is good for monitoring everything.

The only things i need to touch for 4.8ghz is vcore i set to +100mv offset, Load Line Calibration i set to High and Uncore to 4.7ghz.

I know im lucky and a lot of people need to increase the other voltages for the memory controller, uncore and input but for me its not needed until i go to 4.9 but i only use that for benchmarks.

Anyway its all in that guide, let us know if ya have a magic 5ghz+ chip +D
 
Thanks for the tips. I'm not aiming for 5Ghz. Just a moderate overclock. Basically I'm looking for whatever is possible without increasing the voltage more than a smidge. I'd be happy with 4.5 or 4.6 on all cores honestly.
 
Well I think I need that guide as I've struggled to maintain anything over 4.0ghz perhaps I have a bad chip but i'm hoping its me not doing it right.
 
Doobedoo, Your Ranger bios can't be too different to my Hero's bios so below are my settings for 4.4Ghz.


AI Tweaker menu

AI Overclock Tuner - Manual
CPU Strap - 100mhz
PLL Selection - LC PLL
Filter PLL - Low BCLK Mode
BCLK Frequency - 100.0
Initial BCLK Frequency - Auto
Asus Multicore Enhancement - Auto
CPU Core Ratio - Sync All Cores
1x Core Ratio Limit - 44 (this sets the same for the other cores)
Min CPU Cache Ratio - 8x (might want to leave this alone until the cpu is stable)
Max CPU Cache Ratio - 44x (might want to leave this alone until the cpu is stable)
Internal PLL Pvervoltage - Auto
BCLK Frequency : DRAM Frequency Ratio - Auto
Dram Frequency - Set to whatever speed your ram is, 1333mhz in your case.
OC Tuner - As Is
EPU Power Saving Mode - Enabled
Dram Timing Control - enter your first 4 timings in the first four entries

Digi VRM+

CPU Loadline Calibration - Auto
CPU Voltage Frequency - Auto
VRM Spread Spectrum - Disabled
Active Frequency Mode - Disabled
CPU Power Phase Control - Auto
CPU Power Duty Control - T.Probe
CPU Current Capability - Auto
CPU Power Thermal Control - 130

CPU Power Management

Enhanced Intel Speedstep Technology - Enabled
Turbo Mode - Enabled
Set everything else to Auto

Extreme Overvoltage - Disabled
CPU Core Voltage - Manual Mode
CPU Core Voltage Override - 1.265v (May not need so much or may need more depending on the chip)
CPU Cache Voltage - Manual Mode (might want to leave this alone until the cpu is stable)
CPU Cache Voltage Override - 1.30v (might want to leave this alone until the cpu is stable)
Everything else down to CPU Input Voltage set to Auto.
CPU Input Voltage - 1.900v (mine actually needs this much but you may get away with 1.700v)
DRAM Voltage - Set to whatever your ram needs
Everything else set to Auto
 
Well I set everything to what you have and it crashed entering windows so I up'd the voltage to 1.280 and it made it into windows then crashed. But it seems to be stable at 4.3 @1.265 volts so I'll leave like that for a bit then try again.

What do you guy's recommend as a safe voltage? Temps are not too much of an issue as I have a custom loop but I don't want to put unnecessary volts through it though I also understand that not all chips are equal.
 
1.35 is as high as most people go for daily use on water, i would just pick the highest overclock that keeps you under that.

I don't think anyone knows for sure what voltage is suitable without too much degradation during the lifetime of the chip. I think everyones idea of a chips lifetime is different also, most overclocking enthusiasts have changed CPUs by the time they start to notice anything major. I know a few people who used sandy bridge cpus at 1.4v for a good few years but different gens will handle different voltages so its irrelevant really.
 
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I had a sandy i7 at 1.43 for five years. No issues.

However, due to my NHD14 and about 14 case fans all going full tilt I never exceeded 65 celsius in gaming and day to day use.
 
What do you guy's recommend as a safe voltage?
Click to expand...

depends on your cooler if your on air or water?

on air i had have mine on 1.36volts .on water was able to push upto 1.5v but even at those volt was never able to get it past 4.6ghz.

Zia
 
BluD said:
1.35 is as high as most people go for daily use on water, i would just pick the highest overclock that keeps you under that.

I don't think anyone knows for sure what voltage is suitable without too much degradation during the lifetime of the chip. I think everyones idea of a chips lifetime is different also, most overclocking enthusiasts have changed CPUs by the time they start to notice anything major. I know a few people who used sandy bridge cpus at 1.4v for a good few years but different gens will handle different voltages so its irrelevant really.
Click to expand...

Well I had an old Amd phenom dual core that I got lucky with and was able to unlock the extra 2 cores for a ridiculous price of £65 :). I overclocked that as much as I could 3.7ghz and that thing was rock solid for about 5-6 years in fact it was still running when I replaced it.

Anyway I'd be happy if it lasted 1-2 years then I'd like to upgrade to Zen if it turns out any good, if not to what ever the best bang for buck is at the time.
 
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zia said:
depends on your cooler if your on air or water?

on air i had have mine on 1.36volts .on water was able to push upto 1.5v but even at those volt was never able to get it past 4.6ghz.

Zia
Click to expand...

Water cooled dude so temps are pretty good and will be even better when I decide to upgrade to a bigger case and bigger rads.
 
I wouldnt be pushing 1.5v stick to 1.35.

I had a bios bug earlier in the year that caused my voltage to go to 1.5v for while without me noticing, i thought it hadnt degraded the chip at first but after a while i noticed i need another 10mv to keep the same overclock so i guess for the short amount of time it was running at 1.5v it had degraded quite fast.
 
I wouldn't go any higher than 1.35v either but I have seen people on here using up to 1.4v. Running at 1.5v is just insane and will probably end up killing the cpu in the end. It doesn't matter if you are watercooling or air cooling because all that does is keep the temps down. It will be the actual voltage that kills the cpu.
 
I personally would only use upto 1.35v for daily long term usage on custom water. Benching runs I'd go up to 1.45v on Custom WC I only push 1.5v+ on ss at a minimum
 
I've heard a few different figures posted about here and there but I think I'll use 1.35v as my maximum and just play around a bit until I find the sweet spot. I wasn't able to get over 4.0 but now I'm at 4.3 @ 1.265, so even if I only get up to 4.4 I'd still be happy with that.

Cheers Guy's
 
I think the general rule for Vccin is 0.4-0.5v above your vcore, so for instance if you're running a 1.35v vcore you'll want vccin around 1.75v to 1.85v. Just test different values, keep it under 2.2v though as your not extreme cooling
 
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