• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

Help me reach 5ghz with my 2500k

S

SickBeast

Lifer
I have it running nicely at 4.5ghz at 1.375v. Under load I'm hitting the mid-60s temp wise.

My motherboard is an Asus P8P67.

I'm wondering if I need to mess around with the VCCSA, VCCIO, and CPU PLL voltages to get a higher overclock.

At 1.5v it seems as though I can hit 5ghz with reasonable stability.

I'm wondering if you guys know of a few tweaks to obtain really high Sandy Bridge overclocks.

TIA
 
For Asus P67 series:

PLL overvoltage Enabled

Manual VRM set 350

All powersaving actively enabled (EIST, C1E, etc.)except for CPU throttling and powersaving EPU profile.

Phase controls set to extreme.

Spread spectrum and Virtualization tech OFF.

Keep CPU PLL at 1.8v for now.

VCCSA auto unless running 2133.

VCCIO auto too.

You could try 49 x 102.1 or 48 x 104.2 but you probably won't be able to pull off 48.

Your chip might need 1.5v - it appears to be a mediocre or average 2500k if it needs 1.375v for 4.5ghz stable.

I have one that only needs 1.32-1.344v for 4.8ghz stable.

What is your cooling and temps?

Bios 2302 (current) is good and bios 1305 (I think) was very good for overclocking.
 
Last edited:
You will want to bump up your VCCIO if you're overclocking your RAM and overvolting that. VCCIO and RAM voltage should be within .5V of each other.
 
I have a Nzxt Havik 140. It's about as good as the best air coolers on the market AFAIK.

Thank you for the tips, I will try them and report back soon. I'm not going to push 1.5v though; I'll settle at 4.8ghz if I have to.
 
4.9ghz was not stable at 1.475v using the settings you told me so I'm trying 4.8ghz now.

Is there a reason why you suggest overclocking the FSB a bit?
 
You put more stress on the ram and less on the cpu so if your IMC can handle it you can end up with the same stable overclock goal with slightly less cpu volts.

4.6-4.8ghz is a frequent spot where ppl stop as far as overclock vs. increase in temps/volts for most on air depending on the chip.

Also a lot of ppl stop at the highest multi for their chip with PLL Overvoltage OFF so they don't have standby/resume from sleep issues.
 
Last edited:
Well, I'm stable so far at 4.8ghz at 1.45v. Thanks very much for your help. I'm sure some of your settings made a difference. I'll see if I can maintain stability with a little less voltage.
 
NP just try to settle for an overclock stable at 1.4v or less though.
And when you figure out the magic voltage for the overclock, switch over to offset mode for the cpu - it'll overall run cooler and give you more life - it basically acts at stock speeds/idle 1600mhz and stock volts until it encounters a load and ramps up to the offset voltage matching the vcore that you have predetermined - you'll have to play with it a little once you figure out your end overclock target and the vcore required for it.

And then PM me in 2 weeks as I get ready to sell my 4.8ghz 2500k and/or 2600k if I am happy with my new 3770k, haha 😉
 
Yep I figured out offset voltage awhile ago. Thanks again for your help.

Unfortunately 4.8ghz crashed and burned so I'm going to try again for maybe 4.6 or 4.7.
 
You can get 4.6ghz which i would have guesed for your chip anyways.
Update the latest bios though it's decent.
 
Yeah I have the latest bios.

I like how my chip runs at 4.5ghz; my temps are good and the voltages are reasonable. I think I'll just give up on pushing for 5ghz.
 
5 ghz is just a number.
4.5ghz is plenty fast for anyone and definitely does not bottleneck.

Be happy or sell your 2500k on ebay (could sell for $175 probably) and pick up either a tested 2500k or the new 3570k.

Not that the P8P67 bios runs the new 3570k BUT will not let you use the K function or raise the multi above 34 until there is a 3XXX series bios (I asked Asus).

But at least when I had a 3570k on a z68 it was cake getting to 4.5-4.6ghz.

And a 4.5-4.6ghz 3570k performs like a 4.8-4.9ghz 2500k.
 
Last edited:
I don't think I'll upgrade for a 15% boost. Eventually I might juice this CPU and ramp it up to 5ghz if I actually need that much power. My next CPU will probably be Haswell.
 
if you actually need 1.375v for 4.5 Ghz, there's no way you'll hit 5. Seems like you are already close to the sweet spot for the chip, you can push some more volts for 4.6+ but it's not really worth it IMO
 
to get 5.0 you need to set LLC to extreme,digi vrm pwm to extreme,digi phase either optimised or extreme and pll set to enabled and 1.8125,speed spectrum to auto or 900k voltage set to 1.5 and digi currant set to 100% at that voltage,higher if you set lower volts on the cpu as it will raise the power once load goes up.

to get 2133 fully stable you need to bump the memory to 1.65625.you will get warning but you need this set as the voltage drops a bit under load and will cause unstabilty.

This should get you 100% stable with avx and full load intel burn test but your temps will be around 85-90c as my 2600k with 8 threads and avx on will hit 82c with a custom water setup with 2 radiators and 4 fans.

Most people say there chips run at 4.8 with less volts but ill bet my computer they are not avx intel burn test stable at those lower volts.
 
grkM3 said:
to get 5.0 you need to set LLC to extreme,digi vrm pwm to extreme,digi phase either optimised or extreme and pll set to enabled and 1.8125,speed spectrum to auto or 900k voltage set to 1.5 and digi currant set to 100% at that voltage,higher if you set lower volts on the cpu as it will raise the power once load goes up.

to get 2133 fully stable you need to bump the memory to 1.65625.you will get warning but you need this set as the voltage drops a bit under load and will cause unstabilty.

This should get you 100% stable with avx and full load intel burn test but your temps will be around 85-90c as my 2600k with 8 threads and avx on will hit 82c with a custom water setup with 2 radiators and 4 fans.

Most people say there chips run at 4.8 with less volts but ill bet my computer they are not avx intel burn test stable at those lower volts.
Click to expand...

Ocing a i7 and i5 are a little different
 
I's crazy the way theses chips seem to have a sweet spot..
I have a 2700K folding rig that is stable at 4.6g w 1.31v ..

To run 4.8 I have to use 1.43 with lots more power and heat ...

I leave it at 4.6..
 
Well you could try lowering PLL to 1.55-1.7 - some ppl say they can be stable at a lower vcore with lower PLL.
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top