i5 750 overclock, my 1st attempt (noob alert!)

classicVin

classicVin

classicVin

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i5 750 overclock, my 1st attempt UPDATE PAGE 2 !

hello guys,

So i have just set up my new pc, got it running all smooth on standard clocks.
Now i have gone onto overclock my computer,

I have been reading loads of guides and i decided i wanted to overclock my i5 750 to 3.6ghz on stock voltage, i wanted stock voltage as i saw some graphs of when you increase the cpu voltage and what it does to the power consumption !

I have set my blck freq (think its called that) in the bios to 180 and as my multiplier was 20 that would hit 3.6ghz.
ofc turning off speedstep in the process.

It booted into windows fine, and i have began "stress testing" with prime95.

Monitoring the cpu temp with speedfan aswell.

Here are my current results :



Uploaded with ImageShack.us

I havnt seen my cpu temps go above 60*c when stressing it with prime95, Is this an ok temperature? Is it going to rise much above this when gaming?
Also i have the side of my case off atm, im hoping that will not change when i put it back on.

As you may be able to see that i have not touched the qpi speed,
i would quite like to know what to change it to? or what to set it at ect?

Just after some hints and tips from you overclocking pro's :D

My motherboard is a Asus P7P55D-E.

Thanks for your time !
 
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Im certainly no overclocking pro but your temps form gaming deffo wont reach the same temps as when your running stressing programmes, although having the side panel off will make your temps better so your probably better off testing with the side panel on unless your going to leave it off perminantly. Also i usually use Intel Burn Test to aswell as is stresses the chip more than prime95
 
What RAM sticks are you using with this rig? Post a snap of RAM timings in CPU-Z.

Set QPI speed to 16x/32x (or whatever is the lower value).

Set VTT/IMC voltage to 1.15V or so. PLL to 1.85V or auto, PCH to 1.08-1.1V.

Leave your side panel on the case, you want your potential temps to reflect the worst case scenario.

Did you leave vcore at auto? If so, what are the idle and load voltages? Whatt about LLC?

Make sure C-States, C1E and EIST do not cause system instability.

Use RealTemp/CoreTemp for monitoring temperatures under load.

Do not leave any voltages on auto unless you're absolutely sure that your board doesn't overvolt any of them.

Make sure your HSF is seated properly.

To make sure your system is fully stable, run prime95 blend test for approximately 8h and 20 loops of IBT with max RAM usage. That is after you tweak all settings and want to test the system's stability.
 
Aaaah - crank it up to 4GHz! Stock voltage overclocking is for nancy boys :p :) If you're worried about your leccy bill, the difference between 3.6 and 4.0 with some exra voltage is, what, a dim lightbulb? Not really gonna be a noticable blip on your bill even if you're running at 100% 24/7. Just go for the performance you want. 3.6 on stock volts with those temps on air is pretty good, so looks like you have a fairly nice chip. 4GHz should be a doddle.
 
hi guys,

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http://www.overclockers.co.uk/showpr...=8&subcat=1517 is my ram

Would there be a big performance increase from 3.6 - 4ghz ?

I think my vcore volts are on auto. But would upping the volts alittle decrease the temperature?

And what is LLC?

thanks !
 
What resolution do you game at? At higher resolutions (1680x1050 and above) usually the GPU is a limiting factor (especially if you play games with AA/AF turned way up. Overclocking from 3.6GHz to 4GHz can boost your FPS by 0-15% or so, depending on many factors. What graphics card do you have?

Upping the volts doesn't decrease temperature - it would generally increase them. But if you have them set to auto, you cannot really say what

LLC - Load Line Calibration
 
ah right, well i have a cheap x1950pro 256mb that i will have until the end of the month, then im getting my 5850.
I game at 1024x768 and 1920x1080

I dont think i can change load line calibration, and changing the qpi i can only change it to some 4 figure value, from what i remember something like 5682 or 6820 something along the lines of that.

Thanks !
 
Those QPI values represent either a Bclk x32 or Bclk x36 ratio. Doesn't seem to make any difference to my performance, so I leave mine on x32 - i.e. the lower value incase there is any effect on stability (not that I noticed any).
 
it only goes up to 3.6ghz when i do a burn test ?
Should it not be at 3.6ghz all the time ? i thought this was the speedstep causing the change of multiplier but i turned that off :S ?


i'm getting a max of 72*c on the intel burn test when using core temp to monitor
 
hm, i have lowered my overclock down to 3.3ghz but enabled speedstep,
But speed step doesnt seem to be working when stressing it with intelburn (the multiplier should go above 20 no?). Also my max temps are still 69*c
 
You have to enable Turbo Boost, C-states and EIST to benefit from higher multipliers (21-24x). Also leave CPUs multi to 20x/Auto.

Lower multiplier in idle is cause by C1E/C-states in general.

Why are you going backwards with your overclock? :p
 
just wasnt liking my temperatures i was getting, but i have now put it back to 3.6ghz as the temps were pretty much the same. what kind of temperatures are you getting from yours?

I'm now testing it with prime95 and its been crashing / restarting within a couple of minutes, so i'm slowly upping the vcore to see what i can get it stable at on 3.6ghz.

I see in your signature you have yours stable @ 1.2v is that bang on 1.2 or is it more like 1.27 ect ive put mine at 1.26 to see if its stable.

thanks
 
It's set to 1.18V in BIOS with LLC on, 1.2V idle and 1.23V load under prime/games. 100% stable but had to disable C-States causing instability. I'll probably try to drop the voltages a little when I have more time to do proper stress testing.

35c idle / 60c load
 
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What does your vcore drop to under load? Set it up so it doesn't drop below 1.25V or so. Then sort out your RAM by uping the voltage to 1.65V (I guess you have set it to auto).

If it doesn't help, set your VTT/IMC voltage to 1.2V.

Try turning off C-states and C1E if it sorts instability issues.
 
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