Overclocking i52500K on ASUS P8P67 PRO

Kornowski

Kornowski

VIP Member
Haven't tried overclocking since I had my E6300 and Q6600 and that was a long time ago. Just tried with my i52500K.

I locked the BUS speed to 100 and set the multi across all the cores to 44, with the vcore @ 1.275 and the RAM voltage at 1.5v @ 1333Mhz. I'll see how it goes. What are people's thoughts? Seem Ok/reasonable?

GK8wTfV.png
 
Temps are ok, just make sure you stay below 85 degrees (although Intels max says 90...)
I don't go above 80, because I don't feel comfortable then... (only when I do some benchmarks @5.2GHz, but that's for only a short time)
Voltage is pretty good, maybe try lowering a bit, but with this voltage you can't do anything wrong. Make sure you test its stability with prime first if you decide to stay with this.
 
Your great at that temp, as smileman says. There are a few features you might want to run through just to ensure your rock-stable. Spread spectrum, load line calibration, VccSA (for memory OC's), and VccIO are all helpful in that respect.
 
SmileMan said:
Temps are ok, just make sure you stay below 85 degrees (although Intels max says 90...)
I don't go above 80, because I don't feel comfortable then... (only when I do some benchmarks @5.2GHz, but that's for only a short time)
Voltage is pretty good, maybe try lowering a bit, but with this voltage you can't do anything wrong. Make sure you test its stability with prime first if you decide to stay with this.
Click to expand...

Yeah, I did have the vCore a little higher and the temps were too high for my liking. My cooler isn't all that great, I'd rather lower the OC than buy a new one though.

You think it seems a little too high? I'm going to experiment with the offset so it'll drop when it isn't needed. Any advice on that?

lovely? said:
Your great at that temp, as smileman says. There are a few features you might want to run through just to ensure your rock-stable. Spread spectrum, load line calibration, VccSA (for memory OC's), and VccIO are all helpful in that respect.
Click to expand...

Haven't seen you around for ages, man! Can you explain them a little more? haha. I don't plan on OC'ing the memory really.
 
I think you can get lower voltages than that. I am not really too familiar with all of the voltages that Lovely mentioned but for my i5 I lowered the PLL voltage and I was able to get more stability with an overall lower Vcore. PLL might be the same as Load Line Calibration if I am not mistaken.
 
salvage-this said:
I think you can get lower voltages than that. I am not really too familiar with all of the voltages that Lovely mentioned but for my i5 I lowered the PLL voltage and I was able to get more stability with an overall lower Vcore. PLL might be the same as Load Line Calibration if I am not mistaken.
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Sorry, I haven't overclocked for a while. What do they do?
 
Kornowski said:
Yeah, I did have the vCore a little higher and the temps were too high for my liking. My cooler isn't all that great, I'd rather lower the OC than buy a new one though.

You think it seems a little too high? I'm going to experiment with the offset so it'll drop when it isn't needed. Any advice on that?



Haven't seen you around for ages, man! Can you explain them a little more? haha. I don't plan on OC'ing the memory really.
Click to expand...


The temp is perfectly ok. When you're gaming, you'll not reach your max anyway...

Disable spread centrum (should improve ability to overclock is what I heard, never enabled it either), set load line calibration to 50% (= High), if you're not overclocking on the memory, you don't need to use the rest lovely said.
Disable every powersaving tool /auto setting/..., but enable speedstep and C1E. Your overclock will have no problems with these powersaving options enabled. (since you're planning to use the offset mode, I think you want to have a changing voltage right?)

When using offset, you don't really know what voltage you'll get (not with my crappy board though.)
First try to adjust +0.010 and lower it until you get errors. (you can go in -0.0... with offset), then just run a stability test en up the offset by 0.005 with every crash.

Good luck!
 
salvage-this said:
I think you can get lower voltages than that. I am not really too familiar with all of the voltages that Lovely mentioned but for my i5 I lowered the PLL voltage and I was able to get more stability with an overall lower Vcore. PLL might be the same as Load Line Calibration if I am not mistaken.
Click to expand...

Load line calibration allows your cpu to use more power as given in BIOS. You can lower your vcore then yes, but your cpu will need the same power to get stable...
The tool is designed to reduce vdroop, so it doesn't lower its voltage (under the given voltage in BIOS) when running under full load. The higher your oc is, the more load line calibration is needed (not really needed, but it's a handy thing...)
 
I can't really explain it but this is the best explanation that I found when OCing my i5

From
http://www.benchtec.co.uk/forums/threads/8337-CPU-PLL-voltage

This is going to get too long if I take it to the hilt (and I dont have time to break it down that far - self help please people). Any buzzwords you don't understand search for and spend some time learning.


How voltage changes the operation of the PLL loop can only be explained fully by the Intel engineers that designed it. It's essentially a feedback mechanism (frequency synth VCO etc) that keeps the output clock frequency time aligned (in phase) with the reference clock. As the output clock frequency is increased, downstream sampling margins are reduced if there is any phase variance between the CPU clock and any related sub-domain that obtains its reference clock (PCIe, DMI etc) from another source or another output node of the master clock generator (transmission line variance and other factors).There is also the chance that the level of voltage applied has an impact in the output clock jitter (higher levels of jitter will reduce sampling windows).


By changing the PLL voltage at the CPU side, you are either making a very subtle change to the oscillating frequency of the VCO (it is a voltage controlled oscillator after all), or you are affecting the feedback loop of the PLL (bandwidth and gain). This can alter the output frequency such that you either make the downstream sampling margin better or worse. The effects of PLL voltage manipulation will vary from platform to platform depending upon the implementation and perhaps even temperature drift of the oscillator (insight to why things change when you go cold).


This stuff is just the tip of the iceberg, anything deeper and one really needs to be an EE to really get a grasp.

-Raja
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The way that it really boiled down to for me. I can go for a mild OC and lower the PLL voltage to try to fine tune the oscillator so I can get a stable OC with a lower volatge.

On the other hand I have heard that you can raise the PLL voltage if you are going for a highest OC because it will allow for more fluctuation in the oscillator. I am not really sure on that one. I do know that a higher PLL voltage will result in higher temps so I never really went down that path.

Just as an example for me I found stability with 4.5 with Vcore at 1.32v and a PLL of 1.8. When I changed the PLL to 1.65v I was able to lower my vcore to 1.24v and still remain stable.
 
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I found this good tutorial for using the offset - http://rog.asus.com/forum/showthread.php?2162-Overclocking-Using-Offset-Mode-for-CPU-Core-Voltage

Looks like I stick it on Auto to see what it 'thinks' I should use, then use the offset to reduce that value to a voltage I 'know' it needs.

For example if our full load voltage was 1.376V in the operating system, and we’d like it to be 1.32V instead, we simply set 0.05V as the negative offset (1.37V-0.05V=1.32V).
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I've read in a few places that I should change the VRM Frequency to Manual and 350, what does this do?

Sorry for all the questions!

EDIT: Looks like there's varying suggestions on what to set the PLL/Load Line Calibration to online, I keep reading different things.
 
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Kornowski said:
EDIT: Looks like there's varying suggestions on what to set the PLL/Load Line Calibration to online, I keep reading different things.
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PLL voltages change from system to system. The best way to work with it is to experiment with how it effects your system OC.
 
If you want to try for stability at lower voltages then yeah. Just be sure to find the lowest stable voltage with the standard PLL voltage, not auto, then go lower. Take it one voltage at a time.
 
Kornowski said:
I found this good tutorial for using the offset - http://rog.asus.com/forum/showthread.php?2162-Overclocking-Using-Offset-Mode-for-CPU-Core-Voltage

Looks like I stick it on Auto to see what it 'thinks' I should use, then use the offset to reduce that value to a voltage I 'know' it needs.



I've read in a few places that I should change the VRM Frequency to Manual and 350, what does this do?

Sorry for all the questions!

EDIT: Looks like there's varying suggestions on what to set the PLL/Load Line Calibration to online, I keep reading different things.
Click to expand...

That's exactly what I said above...
I only adjust a little in the beginning to be sure the voltage will not change anymore in a wrong way.

EDIT: + what I understood from load line calibration, the higher your overclock, the more vdroop, so the more you'll need to tune the voltage with it (llc) to reduce that vdroop. Most people say between stock and 4.2ghz: 25%, 4.2-4.8: 50%(or high), 4.8-5.2ghz: 75% (ultra high), 5.2-6ghz: 100% (extreme).
So I think 25-50% should be what you need. You can test this by disabling speedstep and C1E, so the voltage is running constant. Then measure the voltage difference in full load and idle (idle should be higher if there's vdroop), if there's vdroop (I'm speaking of more then 0.010v difference), up that load line calibration.
 
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Thanks for the help so far guys, appreciate it.

I've done a bit more tweaking since I got in from work. I've set the PLL/Load Line Calibration to 50%, which I think is either medium or high I can't remember. The VRM Freq is now 350, too.

I've set my Core Voltage to offset mode, with -0.035. This seems a lot to me though? Though it's what I think I need to get the correct voltage. Other than setting it to manual and having it constantly stay at the value I want.

FpEHRdH.png


How does that look/sound?
 
Kornowski said:
Thanks for the help so far guys, appreciate it.

I've done a bit more tweaking since I got in from work. I've set the PLL/Load Line Calibration to 50%, which I think is either medium or high I can't remember. The VRM Freq is now 350, too.

I've set my Core Voltage to offset mode, with -0.035. This seems a lot to me though? Though it's what I think I need to get the correct voltage. Other than setting it to manual and having it constantly stay at the value I want.

FpEHRdH.png


How does that look/sound?
Click to expand...

I need 1.315v for 4.5 or 4.6 (don't know anymore) so that seems pretty ok! (I got HT enabled though, and my board isn't as good as yours)
Try lowering it, but with this voltage you won't do anything wrong! Temps are also ok.
Did you test the vdroop?
 
SmileMan said:
I need 1.315v for 4.5 or 4.6 (don't know anymore) so that seems pretty ok! (I got HT enabled though, and my board isn't as good as yours)
Try lowering it, but with this voltage you won't do anything wrong! Temps are also ok.
Did you test the vdroop?
Click to expand...

I haven't tested it properly yet. I literally set it up and ran Prime for a few minutes before having to head out. I'll have to test it properly.

Does the offset seem pretty big? Also, is VID just what the CPU thinks it needs? It's not something I need to worry about? It looks pretty high.

I haven't yet, nope.
 
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