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i5 Overclocking Guide (less than 4 GHz)

post #1 of 36
Thread Starter 
(You may copy this and use it as you see fit, by permission of the author.)

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 may or may not be able to use 1600 at all frequencies, as it will not stabilize for ME over 3.612 GHz (which is X18 @ 200 BCLK @ X8 Memory Multiplier with a 4:1 DRAM:FSB Ratio @ 805 MHz), that doesn't mean it won't work for YOU!

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

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

3.612v
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 1.3v, If you cannot get your system stable at 1.3v 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, it's not like the 4.0 GHz guide for the i7/i5 as it was more focused specifically for lower Overclocking for the i5 processor alone. I did not write this to compete with foxy, I wrote it for those wanting to see some results of overclocking.

These pictures were included only as a guide, partly as proof of my work, they are not here for show of awesomeness, for I am still new to overclocking myself! I forgot to take the picture of the lowest Overclock. (sorry)

Cheers! (Let me know if I made any gross errors!)
LL
LL
LL
LL
Edited by _GTech - 12/31/09 at 9:21pm
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post #2 of 36
Thread Starter 
Did anyone like the guide?
Edited by _GTech - 12/31/09 at 10:09pm
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post #3 of 36
I liked it - not 100% relevant to my recent efforts (as I have the 'big brother' chip), but a good read to know what should be achievable with my rig. I've had trouble getting mine to OC as I'd like, I'm sure this is down to my knowledge mostly. I had no trouble on Core 2, as there were only 3 relevant voltages, and 2 relevant frequencies - Nehalem has too many parameters! lol
 
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post #4 of 36
Thread Starter 
I recently Changed my RAM to Corsair XMS3 - DDR3 1600, the OCZ Golds were not passing Mem Test! (guess they couldn't hold up to the brutal torture testing!)

I haven't overclocked over 3.62 GHz yet with the new RAM, but I'm very tempted to take try my system at 3.8 GHz again and see how it works on the Mem-Test / Stress Test...

Hope someone has been able to use this guipe in some way, thanks for reading all..
Edited by _GTech - 1/11/10 at 11:28pm
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post #5 of 36
Quote:
Originally Posted by _GTech View Post
Did anyone like the guide?
Yes.

As I can see you have the same CPU and motherboard as me, so maybe you can help me.

I've tried to OC my CPU but after a successful prime95 run and a reboot, I get graphically artifact at post and in bios.

RAM set to run lower then 1600 while OC'ing (About 1400MHz at BCLK 175MHz). And I've tried to set the voltage to 1.5v and 1.8 but I get the same result.

I've set vcore to 1.3v as in auto mode it exceeds that.



And my temps look good (running prime95):


And at BCLK 170-175 and over I get those artifact after a reboot.

Some info on my rig:
i5 750
Asus P7P55D Pro
Corsair CM3X2G1600C9DHX (Info on the sticker: 1600MHz, 1.8v) Running dual channel.
Corsair CMPSU-750TX (750W PSU)
XFX HD5850

Edit: It just happened again, running CPU: 21x160 1.3v, RAM: 1600 1.5v.
I'll try to reduce the CPU multiplier to 18 and see what happens.

ok multiplier 18 worked, but 20 didn't, so are 20 and 21 a no go, or are there still options?
I'll try 19 and see what I get.

Edit: I've bumped it to 19x185 and are running some prime95. RAM:1.65v CPU:1.3v
Edited by muuu - 1/17/10 at 12:11pm
post #6 of 36
I have a similar setup and i think u have too high vcore for that settings.

i'll leave mine here hope it helps



as for the graphical artifacts have no clue of what it might be
Edited by tAkErPT - 1/17/10 at 1:08pm
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post #7 of 36
Quote:
Originally Posted by tAkErPT View Post
I have a similar setup and i think u have too high vcore for that settings.

i'll leave mine here hope it helps



as for the graphical artifacts have no clue of what it might be
Thanks, I'll look in to that.
It looks like I only get those artifacts when I'm running at 20x or 21x multiplier.
For the moment I'm running 19x190 and still pushing.
post #8 of 36
Thread Starter 
If you use the easy mode with the TurboV it will tell you the proper voltage, EXCEPT THE RAM, you should always set the RAM at the factory Voltage settings. (ie. whatever CPUz Tells you!)

Don't believe anything but CPUz, it has never failed me!

Secondly, your RAM needs to be AT the proper timings, ie. 1066 / 1333 / 1600, depending upon your RAM Stick, so if you have a 1333 RAM Stick, then go into the bios and change your block till you can adjust your RAM to 1333, finally set all your RAM timings to AUTO, this will ensure your RAM is on track...

I will tell you now that, most problems I have ever encountered while overclocking stem from bad RAM Settings... So make sure you get that right, Turbo V can help you get the proper voltage.
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post #9 of 36
I like the guide and will try it out. BTW I'm new to this overclock stuff.

I've already used the 4Ghz guide to OC my i5 on P5P77D-E Pro to 3.8GHz. However, I think I would prefer to go to a lower OC for the long term.

Questions/Comments:
1. Why leave to RAM timings on Auto? I set my 8-8-8-24 timings in the BIOS. Was that the wrong thing to do?

2. Most people here say that it is better to OC in the BIOS. ASUS provides some neat OCing tools to run from the OS. I have not tried them yet and was wondering if that would be better approach for a noob.

3. On one attempt I made the mistake of setting my BIOS to recognize XMP memory. When I did this it shot my RAM voltage (spec'd at 1.65v) way up to 2 volt. That seemed scary to me.

4. If I OC to say 3.6 Ghz is it OK to leave the Intel Turboboost enabled or should it be disabled?
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post #10 of 36
Quote:
Originally Posted by trolleydriver View Post
I like the guide and will try it out. BTW I'm new to this overclock stuff.

I've already used the 4Ghz guide to OC my i5 on P5P77D-E Pro to 3.8GHz. However, I think I would prefer to go to a lower OC for the long term.

Questions/Comments:
1. Why leave to RAM timings on Auto? I set my 8-8-8-24 timings in the BIOS. Was that the wrong thing to do?

2. Most people here say that it is better to OC in the BIOS. ASUS provides some neat OCing tools to run from the OS. I have not tried them yet and was wondering if that would be better approach for a noob.

3. On one attempt I made the mistake of setting my BIOS to recognize XMP memory. When I did this it shot my RAM voltage (spec'd at 1.65v) way up to 2 volt. That seemed scary to me.

4. If I OC to say 3.6 Ghz is it OK to leave the Intel Turboboost enabled or should it be disabled?
Disabling turbo boost will give better stability, but isn't necessary.

I have a core i5 750 running at 3.5Ghz (166x21) with turbo boost enabled. So with turbo mode it goes to 4.0Ghz (166x24). With my cpu vcore at 1.26xx (1 or 2 ticks above the default voltage) I was able to run prime95 on all 4 cores for 10 hours straight with no error.

Then I tried running just 1 thread and setting affinity to only core 0, so that turbo mode would enable and the core would be running at 4.0Ghz. Not surprisingly, it failed after several hours. I ticked up Vcore another notch to 1.27xx and tried again. This time it worked for over 8 hours, so I tried switching processor affinity to core 1. Core 1 failed after about 6 hours.

So to answer your question, if you want to keep turbo mode enabled, you will need to do a separate stress test for each core in turbo mode.

A question of my own: To get turbo mode stable, should I keep increasing Vcore alone, or is the problem that I need to also raise PLL voltage or QPI voltage as well?
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