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2500K / Z77 OC help

S

silent-circuit

[H]F Junkie
Joined
Sep 18, 2005
Messages
16,132
Got my 2500K to 4.5Ghz easy on this Z77, just used the default Intel "lazy mode" OC options and turned voltage offset down slowly over the course of several boot cycles, but ideally I want to get this thing closer to 5Ghz. Any tips and tricks for someone who's been ignoring this side of things for a while? It's on air, a Prolimatech Megahalems with a pair of Panaflo 120x38mm fans in push-pull.

Right now OCCT/BurnTest are fine, so I think I'm at least stable where I am, just wanting to push it further if I can. I know the general method -- increase voltage, increase multi, reboot, pray -- but was wondering if there are any other settings I should be paying attention to.

Also: Sorry about the dead thread just before this one. Realized the title wasn't very informative. Mods, please feel free to delete / hide it.
 
silent-circuit said:
Got my 2500K to 4.5Ghz easy on this Z77, just used the default Intel "lazy mode" OC options and turned voltage offset down slowly over the course of several boot cycles, but ideally I want to get this thing closer to 5Ghz. Any tips and tricks for someone who's been ignoring this side of things for a while? It's on air, a Prolimatech Megahalems with a pair of Panaflo 120x38mm fans in push-pull.

Right now OCCT/BurnTest are fine, so I think I'm at least stable where I am, just wanting to push it further if I can. I know the general method -- increase voltage, increase multi, reboot, pray -- but was wondering if there are any other settings I should be paying attention to.

Also: Sorry about the dead thread just before this one. Realized the title wasn't very informative. Mods, please feel free to delete / hide it.
Click to expand...

The problem you're going to run into, and what I ran into when I had my 2500k, is that you will eventually hit a voltage wall. After 4.5GHz, I had an exponential voltage increase needed to be stable at every 100MHz after that. Just wasn't worth it. It wasn't even a heat issue, I was basically just going to fry my chip.

For example, my chip was stable @ 4.5GHz with 1.39v. To get to 4.6GHz, I needed 1.44v. 4.7GHz was impossible.
 
Astral Abyss said:
The problem you're going to run into, and what I ran into when I had my 2500k, is that you will eventually hit a voltage wall. After 4.5GHz, I had an exponential voltage increase needed to be stable at every 100MHz after that. Just wasn't worth it. It wasn't even a heat issue, I was basically just going to fry my chip.

For example, my chip was stable @ 4.5GHz with 1.39v. To get to 4.6GHz, I needed 1.44v. 4.7GHz was impossible.
Click to expand...

My experience was exactly the same. Pushed mine to 4.6 and stayed around 1.4V. That was the sweet spot temperature and voltage wise for me.
 
its luck of the draw with the cpu oc my 2600k managed 4.9ghz prime stable 1.4v with pll overvoltage enabled but since i liked standby and didnt really need the performance most the time it was mostly clocked 4.3ghz with pll off
before it hit a wall with 5.1ghz 1.512v barely bench stable couldnt handle 20mhz more even with 1.55v while a friends powered on to 5.5ghz

the 3770k however wasnt so lucky
3.9Ghz 1.08v 55c (stock)
4.0Ghz 1.12v 59c 56c 53c 52c gpu 32c
4.1Ghz 1.16v 62c 60c 56c 54c gpu 33c
4.2Ghz 1.21v 68c 64c 60c 59c gpu 33c
started including actual v under load as it seems to be creeping up higher over the set v at higher levels
4.3Ghz 1.275v-1.28v 75c 72c 66c 63c gpu 34c (been trying to get this 24\7 stable 1.288v its not uncommon for a core to hit ~90c under some loads)
4.4Ghz 1.34v-1.344v 82c 80c 72c 70c gpu 34c
those v levels were not stable just stable enough to pass a 15min x264 test full stability has proven to required ~.02v more

i found i could get ~400mhz worth of extra performance out of the cpu in games by overclocking the ram from 1600mhz to 2133mhz
so its not to be overlooked although most ram doesnt oc to well

arma 2600k
https://forums.bistudio.com/topic/1...mance-comparison-1600-2133-up-to-15-fps-gain/
arma3stratiscpuvsrambar_zps0cf88683.jpg


dragonange 3770k
http://forums.anandtech.com/showthread.php?t=2455994
Dragonage%203770k%20ht%20vs%20ram_zpscgwdojlu.png


thief 2600k
http://forums.atomicmpc.com.au/index.php/topic/55771-cpuram-performance-in-thief/

some ram speed tests run by others
http://forums.anandtech.com/showpost.php?p=37837493&postcount=14
 
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