First of all let me make it clear that overclocking basically means to over-work your hardware and make it operate beyond what it was designed to do. This can sometimes result in permanent damage to your hardware. But don't be afraid, if you carefully follow these instructions, be patient and calm, overclocking will become second nature and you won't end up damaging anything. Trust me!

Let me also make it clear that there can be no definitive step-by-step guide to overclocking in this world, each individual component has different limits and each motherboard has different options and BIOS versions, meaning that OCing (I'll refer to overclocking as OCing from now on) is more of an art then it is a science. This instructable is strictly for Intel CPUs, AMD OCing is drastically different.

Step 1: Requirements and Considerations

First of all, I would like to mention that OCing of Intel CPUs can be done in two main fundamental ways:
1) Increasing the Front Side Bus (FSB), which means to increase the data transfer rate between the CPU and RAM
2) Increasing the multiplier, this option isn't available to most users since almost all Intel CPUs apart for the Pentium Extreme Edition and Core 2 Extreme have their multipliers locked.

Another thing is that we would be using the BIOS to perform all our tweaks, there are various softwares out there, but they only support a limited number of motherboards and are not that reliable. Also note that when you OC CPUs, you are also OCing your motherboard (in which the FSB is implanted) and your RAM. OCing RAM is notoriously tough and risky, but you can deal with this issue by decreasing the FSB:DRAM ratio we will be discussing later.

Ideally, you'd want these motherboards to OC on:
Intel P35
Intel X35
Intel P45

These motherboards are not so good at OCing:
Intel 946 chipset (though I personally have it and managed a 25% OC without any problems)

Perhaps the biggest problem with OCing any component is overheating. If you want really high OCing capacity of 70%+ then nothing other then a water or liquid cooling system will do. mid-range to high-end air cooling is known to be able to OC to around 60% while stock cooling can only reach 30% at max (my E2160 has stock cooling and a 25% OC). There is no exact temperature limit for any CPU. But as a general rule, you wouldn't want your temperature at any more then 75 (degrees celsius) under load. Having it at above 60 degrees shortens the lifespan but that shouldn't be a worry if you don't plan on using your CPU for more then 2 years.

Recommended software
To check for basic statistics regarding your CPU, I strongly suggest that you download the CPU-Z utility from:

And get Speedfan for closely monitoring your temperatures, but before this, look around the CDs your motherboard came with for a specific utility for monitoring them. ASUS motherboards for example, come with ASUS PC-Probe which is far more accurate then universal monitors. But here's the download link if you don't have one:

Also, download a simple application called SuperPI, which essentially gives your CPU a task to do and times how long it takes for the task's completion. Note that this application doesn't support multi-threading meaning it can only utilize the power of one core even if you have 2 or 4 But the purpose here is to check for basic stability and performance increase. You can get it form here:

Step 2: Entering the BIOS

Now then, its time to get down to some actual OCing. Enter your BIOS and navigate to something like "Advanced Settings", if you have an ASUS motherboard, then I can tell you to straightaway enter the "Jumper-Free configuration" in the "Advanced" tab. Regardless, in all motherboards, all the OCing options are located in one place. For details as to where these options are, refer to your motherboard's manual or download it online.
I recommend that before proceeding, you disable C1E support. For ASUS motherboards, it can be found in the "CPU Configuration", its optional though, I haven't done it.

Step 3: Changing the Values

Ok then! Lets get OCing. First of all, you want to increase your bus speed which is at 100MHz - 400MHz. Note that this value, multiplied with the multiplier, equals your final CPU clock speed in MHz. So in the case of my dual-core E2160, the default bus speed (200) multiplied by the multiplier (9x) equals 1800MHz or 1.8 GHz. So, get down to increasing the bus speed, make only minor increments at once, don't get over-confident or impatient, this is what results in accidents. Increase the value by 5 at maximum at one time. Then save changes and exit the BIOS. Next, see if your Windows boots or not, if it fails to boot or restarts automatically during or after the boot process, it means you've gone too far. Re-enter the BIOS and step the CPU back down.
If it goes strong however, do some benchmarking of your system using something like SuperPI, and to be 100% sure, run some games for a while. If it remains stable, head beck into the BIOS and step the CPU up again, repeat this process until your you experience instability.

Step 4: The CPU Won't Overclock Any Further!! What to Do??

Sooner or later, you'll hit a point where the CPU just can't take it anymore and you will start experiencing instability. But don't be depressed just yet, there is a way around:

1) the most common way is to increase the CPU vcore voltage. Make only 0.05 - 0.1 volts increments at once, anymore could permanently damage your CPU. This is a very common tactic since an OCed CPU needs more watts and volts to handle the extra tasks at hand. Also note that "AUTO" settings aren't at all good ionce, even at stock, they supply too much or too little voltage. Also don't increase your voltage too much, anything above 1.4v for a Core 2 chip is not recommended since it increases electronic migration and drastically decreases your CPU's life.

2) Before you increases the voltage however, I recommend that you step down your RAM timings as well. Check your specific RAM model number for its details specifications. If you find that it has something like PC2-5300 on it or 667 MHz, then it means your RAM operates at 667 MHz. If it has PC2-6400 said or 800 MHz, then it means your RAM operates at 800 MHz. If you have PC2-4200 or 533 MHz said, it means your RAM operates at 533 MHz. In cases of expensive RAM, you may have 1066 or even 1200 MHz RAM, which is, in effect, factory OCed RAM that is stable. Check CPU-Z for your RAM frequency. Make sure your RAM isn't OCed by anymore then 15% because this isn't very good for your RAM's life and health. Decrease your RAM's frequency by 133 MHz (which will be the default option i.e. you will be allowed to choose from 533, 667, 800 depending on the maximum frequency your RAM can handle). By doing so, your FSB:DRAM ratio automatically drops or it may be possibe that you have a direct option to change this ratio

In some motherboard BIOS, you might be able to enter a specific number manually which is even better. Once you decrease the RAM frequency, your OC will only add to that decreased number, which means, that in the end, your RAM will be operating somewhere close to its desired speed. The RAM's frequency will be mentioned as DRAM frequency in your BIOS. However, if you have 553 MHz (or PC2-4200) RAM, then you might not be able to select any lower option since this is the slowest speed at which DDR2 RAM operates.

Note: Theses specific numbers (i.e. 533, 667 and 800 are unique to DDR2 RAM. For other RAM types such as DDR, SDRAM the values will be lower while for DDR3, they will be significantly higher

3) Just be happy with what you have and quit OCing! (not the desired option for a brave person)

Step 5: Future Advice and Troubleshooting

No then, if you have been successful, you'll be happy to get some extra performance at no extra cost. But do note that, some time in the future, you may experience instability which may make a late appearance as your CPU ages. In such cases, down-clock your CPU just enough to make it stable.

You might find my guide missing some information, this is because I have tried to make it short unlike all the other guides on the Internet which are of 10 pages! I've shortened it to the best of my capabilities and have missed out on a number of things. If you have a query, then please feel free to ask any questions through comments.

As I said before, it isn't possible to make a complete how-to guide for OCing since it differs from case to case but, again, feel free to ask! And remember, (I don't want to sound like an Intel fanboy but I'm forced to say this) I can only help you with Intel processors. AMD overdrive and HyperTransport works in a completely different way, but you can still ask and hope for someone else to answer.

<p>Hello! Got same CPU(E2160) and had it OC up to 2.7GHz with stock Gigabyte mb (don't remember exactly which one). Temperatures was good(60 under heavy benchmarks 50 while gaming). Motherboard worked without OC for 5 yers and year or two before it stop working and repair guy said that after repair some parts he does not know how to make it work again. So he just plugged in some crappy MSI 945V2 with 2gb memory @667MHz max. This system was OC to 2.16GHz and work 2 years. all this time with intel 775 box cooler, legs was broken when migrating to new mb so i modified them to simple screws, changed thermo interface and got 45 under heviest load. Cooling all time was with 120mm fan linked to power supply and videocard fan.<br><br>Why i`m here? Wonder how to OC my Lap with intel 3825U (i know about heat and blah blah.) Already OC GPU (NV 920m) with Msi afterburner(memory +255, core+50-70).</p>
<p>Hello , I read the gourde and I'm thinking about an OC . But the thing is that I have an older laptop which can not even run games , like the low end ones . I heard the the Pentium cps are really overclockable and I wanted to ask if it would even be worth it . I will give you my laptop model and the cpu model . </p><p>CPU : Intel&reg; Pentium&reg; processor P6100</p><p>LAPTOP : Toshiba satellite C660 - 16Z </p><p>It's quite old and that's all I have but CSGO runs at less than 20FPS . And it's not even a demanding title .I have every setting on low and the resolution of 800 x 600 it is frustrating . I'm getting a PC after the summer but I feel like trying to overclock it . Any suggestions and help on how to do it ? </p>
Cool but i have heard a lot about over clocking i have been wondering will it damage the PC or not if i have cooling because some say it its 50/50 even if you do have fans while others say if i have the fan its fine i just wanna know do you have some kind of jet fans that is stopping it from over heating if so how long has the PC been running while overclocked?
i have an compaq presario c700, with a Pentium dual core the same one it showed on the front page, <br> <br>anyway there is no OCing option in the BIOS. any workaround, like flashing another one, or just the chip set doesn't support it? (i dont know what the chipset is)
i have an compaq presario c700, with a Pentium dual core the same one it showed on the front page, <br> <br>anyway there is no OCing option in the BIOS. any workaround, like flashing another one, or just the chip set doesn't support it? (i dont know what the chipset is)
As long as you dont have an Intel original motherboard, your multiplier wont be locked. I use an Asus and vary the multiplier base frequency to hit the speeds I need. I dont run it overclocked, just take a couple of screenshots and go back.
can u make tutor how to clock intel gpu's i need to clock intel gma 4500mhd for better performance :)
ive got a spare core 2 duo that im gonna overclock &gt;:) <br>i have a better version of intel's d945gtp that im gonna use, same board, but different components, its a spare so im gonna try it, just have to find some ram for it, then a totally massive (possibly so massive it'll have to be custom machined) <br> <br>i intend to gain at least another gigahert over what it currently has, a massive heatsink will be almost necessary, since i cant afford water cooling. <br> <br>who thinks a heatsink the size of the board would be too big?
I found out that i couldn't overclock the d945gtp board. i am not sure about my other one but it doesn't look good for that one either, so i OC'd a 2.6ghz pentium 4 all the way up to 2.9 ghz with just stock cooling. this was somewhat experimental, but it idles at around 55-60 degrees.
nice info...i will try it latter to ma dualcore cpus....thanks
Ya know whats really wierd. I dug on old PC&nbsp;out of my basement I bought years ago and I&nbsp;thought I try this. And the multiplier on the CPU is UNlocked but I can't change the FSB. <br />
I have no idea how to overclock my computer its a Toshiba Satellite L300 Intel Cpu H20 Bios<br />
Can anyone tell me how to get into the BIOS on a Dell Dimension L667r? Thanks
hmm... any chance I can do this with gateway? there are no CPU options... do you think I should try moving some jumpers around on my motherboard?
Not really :P Overclocking is best done on a custom rig whose motherboards have overclocking options. Branded machines usually have most of the options locked. Try to find an option, which will, at the very least, allow you to change the bus speed and alter vcore voltage. Of not, then I'm afraid you can't OC
darn. oh well... I can still screw around with an older comp....
ide advise you to stop playing around with this sorta stuff unless you got someone to show you 1st hand what to do, your going to cause alot of harm to what ever your overclocking
Exactly. I'm taking it easy to avoid destroying a good chip. I've learned that you don't get rushed because you want results, because if you aim for results and push too hard, you've now got a super-heated CPU that will be dead before you can power off.
ahha impossible, it cudnt be dead. she wnt even start if its clocked that high, just reset the bios and your ready to try again
<em>cudnt , wnt </em><br/>Can you fix those glaring errors?<br/>
True. But, there are some (older) systems that don't have the protections.
lol no, its a bios setting, nothing u do can allow u to overclock. so leave it alone or get a new board :)
Hmm....not really. I wouldn't recommend messing around with the board randomly, would do you more harm then good. Just remember to get a custom rig on your nest build
I have to aggree
just dont do what i did to a comp OCed it to the max number then a crack bang and spark and it was gone lucky it was a junka
people like that make me want to hit them, so come here Mr laznz1!
*in weird voice* You fool!<br/>
slowly but surely is the way to go here :P
I've got an Intel Pentium 4 HT (version 531) that normally runs 3.0 GHz. I lightly overclocked it to 3.1 GHz completely stable and cool. Next goal is 3.2.
lol, 3ghz to 3.1? thats SOO SMALL OC, you dnt bother ocing that much cuz u dnt get pretty much any performance increase. and 3.1ghz from 3ghz? u must have sum pretty fine tuning gear on ur pc to get it to that, and if ur going to OC look anywhere above the 10% mark on ur cpu's stock freq. for eg 3ghz would be 3.3ghz
I'm working on it slowly. Note that Prescott chips get VERY hot when running, and I'm still running the stock cooler. Also note that I'm currently at 3.28 (Up .02 from my last update) and being very gentle on the chip. Yes, my BIOS lets me work in small increments. I can either go up 0.01 volts or 1 FSB value with ease, still working with a locked multiplier.
makes no difference. find ur stablest highest frequency then find ur 10% mark and hang around that, watch ur temps and watch for hangups. all u need to do, take gentle steps, thats nonsense. no matter what your doing when OCing ur putting strain on ur cpu FULL STOP, meaning taking it slowly is pointless and wasting ur time. use overclocker forums to see what other ppl have clocked their cpu to on stock cooling
I know that it strains the CPU more. The point I'm making is that I'm taking smaller steps to avoid destroying a chip. And I've found the most stable I can get and as high as it will go is 3.31 GHz. If I push it harder, it won't boot.
Good luck! Prescott P4s aren't exactly renowned for their OC'ing capability :-p
Got it to 3.26 GHz, running stock air cooler, 60 degrees Celsius under mild load.
I have a Intel Core 2 Quad Q6600 (65nm, Kentsfield, G0 Stepping). Stock it runs @ 2.4GHz (266MHz X 9) Mine is running at 3.0GHz (334MHz X 9) Voltage in BIOS is set to 1.275v, and is nice and stable (CPU-Z reads as 1.232v)....V Droop is annoying :P BTW, the mobo is an Asus P5E, with the X38 chipset The CPU Cooler is an Arctic Cooling Freezer Pro (Mk2) With the TJ Max set to 100, the temps never go over 60*c on all cores (thats running Intel Burn Test) Just need to get a watercooling setup....the chip will probably get OCed to 3.6GHz if it will take it...more importantly it will quieten down the damn GFX card...4870X2 with stock heatsink/fan is loud :S
You'd be lucky lol. 3.4 is the most I've normally seen a Q6600 do.
It depends on the stepping from what I have read. (As well as luck of the draw) The Q6600 G0 stepping will generally overclock higher than the previous steppings... I can but hope for 3.6ghz......
my amd core reads 1.5V
amd are alot different, silly statement

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