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i5 Overclocking Guide (Under 4 GHz)

Last response: in Overclocking
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December 31, 2009 5:15:07 PM

First off, let me say that, this is NOT an all encompassing guide, it will not include all the technical information you need to overclock. There are a few guides floating around, and if you have questions, or need to learn more about overclocking, then I would recommend you read those first.

What this guide will do is give you some stable settings for various settings for the processor, motherboard, and ram. These settings may or may not work with a stock fan, it's rather recommended you use an aftermarket Fan Cooler, I'd recommend the Hyper 212+ by Cooler Master, it was sufficient for all testing below. This guide will be about overclocks UNDER 4.0 GHz, for those who are not interested in using a water cooler.

Because the i5 is set up to run 1066/1333 RAM, it's best to use those settings when overclocking, however 1600 RAM is listed below, you will not however be able to use 1600 at all frequencies, as it will not stabilize over 3.612 GHz (which is X18 @ 200 BCLK @ X8 Memory Multiplier with a 4:1 DRAM:FSB Ratio @ 805 MHz)

If you didn't make any sense of what I just said, then you will probably need to do some more reading before reading this guide. With that said, let us move forward.

Testing: At each level of Overclock I first ran the software MemTest86 (at bootup) to ensure the memory was without errors, next I ran at least 5-10runs of LinX, then proceeded with a few hours of OCCT & Prime 95 Each. At Least 8 Hours went into all Testing, which I feel is ample for stability testing.

Motherboard used for Testing: Asus P7P55D Pro
RAM Used for Testing: OCZ 1600 (4GB) (OCZ3G1600LV4GK)

Bios Settings (Disabled C1E / C-State / Intel Speed Step) (Turbo)

NOTE: Pll & PCH were at default settings through ALL testing.. (leave at auto)

All Overclocking Results & Settings

*********************
3.213 GHz
X20 Multiplier
160 BCLK
1600 RAM (X10 Memory Multiplier)
8/8/8 - 24 - CR 2N
5:1 / DRAM: FSB Ratio

CPU 1.2625v
IMC 1.15v
RAM 1.65v (Use your RAM manufacturer's recommendations on voltage ONLY!)
RAM Timings (8/8/8 - 24 - CR 2N) (Your timings may be different!)

********************
3.349 GHz
X20 Multiplier
167.5 BCLK
1333 RAM (X8 Multiplier)
7/7/7 - 20 - CR 1N
4:1 / DRAM: FSB Ratio

CPU 1.2625v
IMC 1.1625v
RAM 1.6v

********************

3.569 GHz
X20 Multiplier
177.5 BCLK
1066 RAM (X6 Memory Multiplier)
3:1 DRAM: FSB Ratio
7/7/7 - 16 - CR 1N

CPU 1.2625v
IMC 1.2v
RAM 1.5v

********************

3.612 GHz
X18 Multiplier
200 BCLK
1600 RAM (X8 Memory Multiplier)
8/8/8 - 24 - CR 2N
4:1 DRAM: FSB Ratio

CPU 1.2625v
IMC 1.25v
RAM 1.65v

********************

3.612 GHz
X18 Multiplier
200 BCLK
1200 RAM (X6 Memory Multiplier)
3:1 DRAM: FSB Ratio
7/7/7 - 20 - CR 2N

CPU 1.2625v
IMC 1.25v
RAM 1.6v

********************

NOTE: These settings may not work for everyone, each board's settings will be different! Same for the RAM, there are however, some rules you should pay close attention to!

WARNINGS:
The maximum recommended voltage for RAM is less than 1.65v, going over this can damage your processor!!!!

I would NOT recommend taking your IMC over 3.3v, If you cannot get your system stable at 3.3v with your IMC, then lower your settings!

I would not recommend taking your processor over 1.3v unless your using a water cooler!!


I was unable to obtain stable results over 3.612 GHz with the proccessor, which would'nt warrant listing them here. That does not mean you cannot get higher, I'm POSITIVE you can! (I have obtained a stable 4.0 GHz OC, but I wouldn't list it here, as this is not an extreme OC guide, it's a more stable "GUIDE", not an definite "How To" overclock your i5 processor!

In conclusion, the i5 - 750 proccessor is a great processor, for the money, it's rather exciting to have something that can overclock to 3.2 - 3.6 GHz stable at different RAM Settings for less than $200! (I got mine for $150 @ microcenter)

If anyone would like to add to this guide, please feel free to, this is ONLY a guide, results will vary depending upon the board, ram, and cooler you use! I never recommend using cheap parts, as cheap = bad (more often than not!)

Let me know if I made any gross errors (thanks)

More about : overclocking guide ghz

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December 31, 2009 6:33:56 PM

_GTech said:

Because the i5 is set up to run 1066/1333 RAM, it's best to use those settings when overclocking, however 1600 RAM is listed below, you will not however be able to use 1600 at all frequencies, as it will not stabilize over 3.612 GHz (which is X18 @ 200 BCLK @ X8 Memory Multiplier with a 4:1 DRAM:FSB Ratio @ 805 MHz)


I would NOT recommend taking your IMC over 3.3v, If you cannot get your system stable at 3.3v with your IMC, then lower your settings!



Why can't you get your ram stable over 3.612 GHz ?

You may also want to have a look at your IMC voltages on the next line there.

Also, the 212+ might be OK for 3.612 GHz (even though you didn't give any temp readings) but a more substantial cooler will let you go farther.

a b à CPUs
a b K Overclocking
January 1, 2010 2:05:43 AM

1. Were you the one who said that 3.6GHz is the top limit of i5 in the poll created by me?

2. Do you know that the absolute IMC/Vtt for LGA1156 CPUs are 1.21V?

3. Yes, not all the frequencies allow you to run the RAMs at their specified frequency.
However, you can always downclock them a bit and the difference is unnoticeable at all.
BTW, I also have a 1600MHz RAM and it is currently ruuning at 180x8=1440MHz with NO noticeable change at all compared to 1600MHz .

4. You can set your CPU frequency to 180x20=3600MHz instead so that you can hugely decrease the Vtt/IMC voltage to about 1.14V which is well within the absolute maximum value.

Related resources
January 1, 2010 2:59:10 AM

Unfortunately, I am unable to edit my original post for reasons beyond my knowledge.

MODERATORS:

Can you edit this line:

I would NOT recommend taking your IMC over 3.3v, If you cannot get your system stable at 3.3v with your IMC, then lower your settings!

To This:

I would NOT recommend taking your IMC over 1.3v, If you cannot get your system stable at 1.3v with your IMC, then lower your settings!

Thank you..
January 1, 2010 3:07:24 AM

BTW: I apologize if I did not clarify cleary that I was not able to obtain stable overclocks over 3.612 GHz, that doesn't mean YOU cannot.

I know for a fact that the Hyper 212+ can run 4.013 GHz @ 1200 RAM stable at less than 70c, it truly is a great fan cooler!

http://valid.canardpc.com/show_oc.php?id=911719

The temerpatures for ALL overclocks above is less then 63c, most were well under 60c!

Idle temps on the Hyper 212+ was at 30-34c at ALL settings
40-45c on 50% load on ALL settings..

Sorry I didn't put that in the Original Post.
a b à CPUs
a b K Overclocking
January 1, 2010 3:44:17 AM

_GTech said:
I know for a fact that the Hyper 212+ can run 4.013 GHz @ 1200 RAM stable at less than 70c, it truly is a great fan cooler!

The temerpatures for ALL overclocks above is less then 63c, most were well under 60c!

Idle temps on the Hyper 212+ was at 30-34c at ALL settings
40-45c on 50% load on ALL settings..


Well, a screen shot with IBT or Prime95 of at least 10 minutes duration along with CPU-Z would work.


January 1, 2010 3:53:18 AM

In my original post on another forums you can find the pictures (PROOF) you desire.

http://www.overclock.net/intel-cpus/638380-i5-overclock...


I use LinX it stresses MUCH harder than Prime95, so you will be reading temps that would be high considering Prime95 rarely can get my temps above 60c at full load. Even at higher than 3.6 GHz too.
!