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i5-2500K O.C. to 4.4GHZ less heat when PLL is enable.

post #1 of 7
Thread Starter 
Hi guys, I'm new to this forum redface.gif. I search quite a bit and I'm confused. I'm trying to O.C. my i5 2500k to 4.4ghz. with Coolermaster 212. Here's are the settings (What I changed)

With PLL enable

CPU Clock Ratio: 44
Internal CPU PLL Overvoltage: Enable
Intel Turbo Boost: Disable

Multi-Step Load Line: Level 3
CPU VCore: 1.280V

I leave the "POWERSAVING" in AUTO
CPU C1E: Auto
C3/C6 Support : Auto

I heard you not suppose to enable PLL when o.c. under 4.5GHZ. But I'm getting much less heat and no problem booting with it enable.
CPU TEMP: IDLE: 38-40C Under load: 60-66C Average 64ish

If I disable PLL I have to up the VCORE volt to 1.350 in order for it to boot. But then when the CPU when under load it will reach 70 C+. When I enable PLL I can lower the VCORE to as low as 1.250V.

I have a few questions that would like to be answer

1.) which setting will be more optimistic.

2.) I'm not quite sure If I should Disable C1E C3/C6. Do I leave it on auto or should I disable them.

3.)Should I be upping the Multi-Step load line to level 4 for 4.40GHZ for more linear stability?

thx for your time
post #2 of 7
The reason I disabled PLL is that I couldn't get my computer to recover from sleep in the S3 state with PLL enabled. For me, the ability to use the sleep (S3) mode and then wake from it was more important than PLL.

It has been recommended to leave C3 and C6 alone. I haven't played with multi-step load lines either. You can check out my BIOS profile in my signature to see the way I'm running things. My at-load temperatures are in the 60s as well, but in Prime95 over an 18+ hour blend I hit 79C on my hottest core (on air cooling, single fan) and in the Intel Burn Test maximum stress settings it spikes that same core up to 86C. Those two programs are notorious for being the absolute toughest on CPU temperatures though, so I'm quite comfortable where I'm at.
Edited by shad0wfax - 11/23/11 at 1:36am
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post #3 of 7
Thread Starter 
shad0wfax I checked your settings, so I changed mine to the following. 4.5GHZ with turbo boost enable...

CPU Multiplier/Ratio: 45
Internal CPU PLL Overvoltage: Disable
Intel Turbo Boost Tech: Enable
CPU Enhanced Hale (C1E): Enable
C3/C6 State Support: Enable

Multi-Steps Load-Line: Level 4
CPU Vcore: 1.380V

CPU VCORE: won't boot less than 1.380. Now my max Temp is like 74C after running 15mins of Prime95. I'll look further to see if it's stable. smile.gif
post #4 of 7
Quote:
Originally Posted by qiqin View Post

shad0wfax I checked your settings, so I changed mine to the following. 4.5GHZ with turbo boost enable...

CPU Multiplier/Ratio: 45
Internal CPU PLL Overvoltage: Disable
Intel Turbo Boost Tech: Enable
CPU Enhanced Hale (C1E): Enable
C3/C6 State Support: Enable

Multi-Steps Load-Line: Level 4
CPU Vcore: 1.380V

CPU VCORE: won't boot less than 1.380. Now my max Temp is like 74C after running 15mins of Prime95. I'll look further to see if it's stable. smile.gif

That sounds a bit high on the Vcore. My settings are not a fixed core voltage though, and my voltage is auto-regulating between 0.976V at 1.6 GHz and 1.360V at 4.7GHz. Although not all CPUs will be stable at the same voltages, it's going to come down to your motherboard itself.

What motherboard are you using? That can make a huge difference in voltages and stability.

You might be better off with your first profile with the lower voltages. I monitor my voltages with CPU-Z and my temperatures with Real Temp, if that helps you any.
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post #5 of 7
Thread Starter 
I'm using
Gigabyte GA-Z68X-ud3h-b3 rev 1.3
RipjawsX F3-12800CL9S-4GBXL x 2 (With XMP enable Profile 1)
MSI 560TI 2GBx2 in SLI
Corsair TX750 V2 750W

at 1.6GHZ my voltage is between 0.995v to 1.0057v
at 100% usuage it's at 1.4011v --- 1.4061

Should I lower my VCORE voltage?
post #6 of 7
Quote:
Originally Posted by shad0wfax View Post

The reason I disabled PLL is that I couldn't get my computer to recover from sleep in the S3 state with PLL enabled. For me, the ability to use the sleep (S3) mode and then wake from it was more important than PLL..

They fixed this in the latest BIOS firmware btw. :3
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post #7 of 7
Quote:
Originally Posted by Inverse View Post

Quote:
Originally Posted by shad0wfax View Post

The reason I disabled PLL is that I couldn't get my computer to recover from sleep in the S3 state with PLL enabled. For me, the ability to use the sleep (S3) mode and then wake from it was more important than PLL..

They fixed this in the latest BIOS firmware btw. :3

Huh, I'm on a P8P67 WS Revolution running BIOS 1402 (09/20/2011) and I still had the problem.... I thought... I guess I can try to play with it and see what happens.

EDIT:

Thanks, you're correct Inverse, PLL enabled does not conflict with my sleep mode anymore. That being said, I noticed absolutely no difference in temperature or voltage with PLL enabled vs disabled. I have come to the conclusion that I have more headroom in my OC than I thought due to this. I'm currently working on a 48 multiplier now at 1.400V and the same temperatures as my 47 multiplier at 1.352 V and my next step is about to be a 49 multiplier. I know that I wasn't able to get super stable at a 48 multiplier on BIOS 1202 with PLL disabled but it's entirely possible that I will be able to get 49 or 50 multiplier stable with PLL enabled.

We'll see where the temperatures take me.
Edited by shad0wfax - 11/23/11 at 11:14pm
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