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I can never reach 4ghz on my i5 750

post #1 of 10
Thread Starter 
I bought my prolimitech megahalem probably close to two years ago with the intention of reaching 4ghz on my i5.

Every once in a while I get it in my blood to try and attempt it again but I can never get past 3.5ghz.

Do I just have to accept that my cpu is from a poor batch or what?

I am at 3.5ghz everything stock, besides my memory being at 1400mhz. My QPI ratio leaves me with the option of [4] (1400mhz) or [5] (1750mhz)

What am I doing wrong? I always get jealous seeing all of you guys with your 750's at 4.0 while I'm left behind at 3.5
Red Devil
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Red Devil
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post #2 of 10
If your Vcore is still at stock, then you should start trying to adjust it, then stress test it right after.
    
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post #3 of 10
Have you tried monitoring the temps just to make sure your cooler is mounted correctly. If so you may just need to up the cpu voltage a bit - that cooler should handle more juice no problem!
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Mini Haswell
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post #4 of 10
I can't get mine to run at stock right now (thank Intel's push-pins for that). lol

Are you keeping your multiplier as high as it can go? Are you staying within your Ram's limitations?
What voltage are you attempting?
    
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Nutty View Post
If your Vcore is still at stock, then you should start trying to adjust it, then stress test it right after.
Just increase it volt by volt while increasing clock? I could try it this way although im sure i have in the past, thats how i made it to 3.5


Quote:
Have you tried monitoring the temps just to make sure your cooler is mounted correctly. If so you may just need to up the cpu voltage a bit - that cooler should handle more juice no problem!
My temps actually looked great from when I was at 3.8, never got out of the 60s from what i recall, that was with doing quick stress tests with fluid mark too, although of course when i go back down to 3.8 from being up at 3.9/4.0 it wont stay stable there either.

Quote:
Are you keeping your multiplier as high as it can go? Are you staying within your Ram's limitations?
What voltage are you attempting?
Multiplier is at 20, and for some stupid reason i cant adjust it, but it should be okay at 20 shouldnt it? I'd like to get my ram back to stock and restart from there but I forgot what I did in bios to prevent me from getting back to normal 1600 (i used Linus tech tips video on youtube, i5 750 overclocking guide to get to 3.5)

I mean, ive had vcore at 1.4 and vtt at 1.3 while at 3.9ghz

I was just trying to keep it juiced up high to see if i could at least stay at those higher clocks but it crashes even when I crank my volts way up (not necessarily for 24/7 but just to see if i can get up there)

I need to just go at this hard for a week until i finally make it there.
Red Devil
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Red Devil
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post #6 of 10
VTT will depend on your RAM and QPI speed..

try:

192bclk * 20x multi = 3.84ghz [to start]
QPI - [3200 -3600mhz]
RAM- [1600mhz for above QPI speeds...] Leave RAM timings on auto

1.44 vcore
1.34 vtt
1.78 PLLv
set DRAM volts accordingly

*if you have skew settings in your BIOS.. add 150-200ps to CPU..


Your 'learning' what your IMC likes.. unfortunately some CPU's have weaker IMC's than others. You will need to play with your QPI/RAM ratio and skew settings to get that stable.
post #7 of 10
I think the Air Cooling section is not the best place to ask your question. Try the Intel CPU's forum.
alpha updated
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secundus
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alpha updated
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secundus
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post #8 of 10
Quote:
Originally Posted by CL3P20 View Post
VTT will depend on your RAM and QPI speed..

try:

192bclk * 20x multi = 3.84ghz [to start]
QPI - [3200 -3600mhz]
RAM- [1600mhz for above QPI speeds...] Leave RAM timings on auto

1.44 vcore
1.34 vtt
1.78 PLLv
set DRAM volts accordingly

*if you have skew settings in your BIOS.. add 150-200ps to CPU..


Your 'learning' what your IMC likes.. unfortunately some CPU's have weaker IMC's than others. You will need to play with your QPI/RAM ratio and skew settings to get that stable.

1.44 Vcore is WAY TOO HIGH for i5 750 on air.
I would try 200x19 (3.8ghz) to start
Vcore=1.325 (work your way down if it's stable)
VTT/IMC-1.3
QPI- Lowest available
Dram- your default ram voltage.
Load line calibration- on/off (usually on)
Don't forget u need to disable all the power saving features as well like c1e, speedstep, turbo mode, etc

if u can get 3.8ghz stable, try 4.0ghz with 191x 21
and adjust your vcore/vtt with other minor voltage tweaks..
there are many guides to overclocking i5 750s on this site. try searching for one and follow the guide.

The above is just a quick start to overclocking but you should be able to hit at least 3.8ghz easy if you can't hit 4.0ghz
Edited by Youngd8 - 11/6/11 at 7:22pm
post #9 of 10
when you set voltages high.. its only to boot OS and run lite stability tests.. much easier than setting too low and not getting POST..then reset, try again etc.

I agree though, and wouldnt go running off Prime95 or IBT with +1.44v ... you can definitely see if its boots OS though, and up speed or lower voltages from there before stress testing for stability.
post #10 of 10
Thread Starter 
http://www.tomshardware.com/reviews/...ck,2438-6.html

Ive been referring to the specs of off that chart. 1.81v for PCH is very high on my mobo so ive put that to 1.1 from what ive seen other users do

Also, this might sound very noobish but the only thing i see relating to QPI is 'QPI Ratio' in my bios that sets the ram mhz from 1400mhz to 1750mhz when i move it from 4 to 5.

Is there some other meaning or alternative to QPI in an MSI bios?

I will try all the input you guys have provided. Also I cant change my multiplier from 20 i dont know why, any of you familiar with msi p55 bios know why?
Red Devil
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Intel X-25m 80gb + Hitachi 500gb 7200rpm Prolimitech Megahalem w/ Scythe Gentle Typhoons... Windows 7 64 bit Samsung T240 1920 x 1200 
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Red Devil
(14 items)
 
  
CPUMotherboardGraphicsRAM
Core i5 750 @ 3.5 Ghz MSI p55 gd-65 XFX HD 5850 + PNY 9800 GT 1GB (PhysX) 2 X 2gb Corsair Dominator 1600 
Hard DriveCoolingOSMonitor
Intel X-25m 80gb + Hitachi 500gb 7200rpm Prolimitech Megahalem w/ Scythe Gentle Typhoons... Windows 7 64 bit Samsung T240 1920 x 1200 
PowerCaseMouse
OCZ ModXStream 700W Thermaltake v9 Black Edition Logitech G9X 
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