Overclocking is the process of forcing something to run at a speed higher than the manufacturer's intended specifications.

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Why are modern CPUs “underclocked”?

I keep reading since years about magical overclockability of modern CPUs. It is said that CPUs (with open multiplier) which are shipped to customers with (let's say) preset 3GHz, can be overclocked ...
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4answers
1k views

Will overclocking your PC with no internet access screw up the system time?

Let's say you have a PC which is not connected to a time server, so it has no external methods of keeping track of time. You turn the machine on, and set the time and date in the BIOS. Then you ...
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7answers
2k views

Is overclocking legal? [closed]

Is overclocking your CPU and GPU classified as being legal ? If so, why don't manufacturers make overclocking easier so that just about anyone is able to play around with it ? - at own risk of course. ...
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4answers
7k views

Is there an equivalent of Memtest86 for CPUs?

I need an easy way to do system stability tests. I have come to rely on Prime95 which does a fantastic job of proving stability (or instability) very quickly; but it requires an OS installed. I would ...
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5answers
6k views

What is the best computer “burn-in” or stability testing software? [closed]

When you buy a brand new computer, it's a good idea to run some software to "burn it in", to make sure that everything is running properly (and the system is stable). People who overclock also do ...
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4answers
613 views

What is overclocking the system?

I have heard this term many time and would like to know what does it exactly means?
9
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2answers
2k views

Is possible to overclock a SSD?

Anyone already had tried to or knows if it is possible to implement in some way an overclock an SSD (or get the same benefits by tunning some parameter on an SSD)?
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4answers
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Is it better to use an offset or manually set CPU voltage (with respect to CPU longevitity)?

The Background: I recently built a new computer, and I'm working with the ASUS P8Z68-V Pro motherboard and Intel i7 2600k processor. While this question does not pertain specifically to my hardware, ...
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3answers
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Water cooling a PC, is it really expensive?

I recently read an article saying you can overclock an i5 750 to perform almost as well as a core i7 975 extreme (factory settings). But obviously this requires some serious cooling. Is installing a ...
8
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2answers
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Maximum CPU Temperature for Core 2 Duo E6400

What is considered to be the highest safe CPU temperature when overclocking? I have a Core 2 Duo E6400 overclocked to 2.85GHz with 1.2vCore. This runs at 29C idle and 45C under load. These ...
8
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1answer
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At what working temperatures will my gpu not only survive, but have a long healthy life

There are plenty of questions about what a safe gpu temperature is, but these seem focused on what temperatures a gpu will survive at in the short term, regardless of whether it may shorten the cards ...
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3answers
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What exactly does “(OC)” mean in products description

Note: this is not a shopping recommendation request I want to buy a nice and fast RAM and a motherboard that supports it. Lets say that I would want to take this RAM (2400MHz), and put it into this ...
6
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2answers
459 views

What steps do you take when overclocking?

When overclocking your system? what steps do you take to get a maximum but stable overclock out of your system? I've personally just slammed up the FSB speed until my system can't run Prime95 for a ...
5
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2answers
919 views

Overclocked too far - computer will not boot

I recently tried overclocking my desktop and I went a bit too far. The machine no longer gets to the screen that allows me to enter the bios. I tried switching the CPU but this did not work, it still ...
4
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6answers
6k views

Can overclocking really break hardware?

My question may seem dumb, but, really, I want to think about it objectively. Let's first say that I'm not expecting to hard overclock a computer (ie. doubling the clock of the CPU), but I'd go by ...
4
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4answers
1k views

Could I have damaged a CPU?

I built a PC around a Q9550 1 1/2 years ago (motherboard is an Asus P5Q deluxe). Specs give 2.83GHz, I overclocked it to 3.40 GHz without any problem (or so I thought) until two months ago. Cooling is ...
4
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3answers
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Over/underclock 5870 on linux without limits?

I want to downclock my Ati Radeon HD5870's memory to 300Mhz and overclock it's core frequency to 930Mhz. I can do this on windows using Ati Tray Tools. On linux, the only way to do this so far has ...
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2answers
2k views

1:1 FSB to DRAM Ratio

Why is it recommended to have a 1:1 ratio of Front-side Bus and DRAM? Does it really affect the performance of the CPU?
4
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3answers
112 views

Am I doing the right thing to overclock this?

This is a follow up to this question. I bought the motherboard mentioned in the question and a 2133 MHz RAM that does figure in the memory compatibility sheet of the board. After assembling it runs ...
4
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1answer
261 views

GPU running underclocked / under normal speed?

I have tried to overclock my card. Seemingly it worked, and the GPU-z shows the OC speed (see GPU3.png). However, current readings are REALLY far from the normal speed of the GPU. That's what I can't ...
4
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1answer
1k views

Overclocking software for AMD?

I know that software-based overclocking is a bad idea - the problem is I am in a bit of a predicament. I am busy with an AI project that is due soon. I am busy running some very CPU intensive ...
4
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2answers
941 views

How to overclock an ATI/AMD graphic card further than Overdrive allows?

I've got a fresh HD 6850 overcloked to 850 MHz with OverDrive. I heard its possible to run it at 1000 MHz but how? Please don't educate me about the risks of overclocking!
4
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1answer
280 views

Memory modules not running at rated speeds

I'm having some odd memory issues with my build. Here are my specifications right now: QDI Superb 4 motherboard Intel Pentium 4 Northwood 2.4 GHz (512 KB L2, 533 MHz FSB) 3x 256 MB PC2100 DDR266 RAM ...
3
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2answers
865 views

Hyper Threading vs Overclocking

What is the difference between these two, and under what circumstances would I want to implement them? Are there circumstances when I would only want 1 and not the other? According to Wikipedia, ...
3
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2answers
1k views

How to optimize PLL voltage

I am overclocking my Core i7 (Ivy Bridge 3770K), aiming for a moderate overclock. Currently I have it easily stable at a pleasant 4.4GHZ - BCLK defaulted at 100.00MHz, with the multiplier set to x44. ...
3
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2answers
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1.35 V RAM in a 1.5 V system - Will it fry or overclock?

The general question is: When installing low voltage RAM in a board that outputs a higher voltage to the memory module, will this fry the RAM or will it be like overclocking it? My specific case is: ...
3
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1answer
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Underclocking without BIOS option

I have never over/under/downclocked my laptop, however it is seriously suffering from overheating. I have cleaned it out and am running the fan at full speed the whole time. I also have turned the ...
3
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1answer
1k views

Unlocking AMD Phenom II X2 550 Black Edition cores - what are the risks?

I've got the above mentioned CPU and a GigaByte GA-MA790XT-UD4P motherboard, which should be capable of unlocking the extra two cores - if I'm lucky and they're not faulty. The Internet is full of ...
3
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2answers
372 views

Is a Black Edition AMD processor required in order to unlock cores and/or overclock?

As the title says, I'm planning on getting an ASRock N68C-S UCC board. It has unlock CPU core technology but would I need to have Black Edition processor in order to make use of that feature?
3
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1answer
1k views

Is it smart / possible to overclock a laptop?

This may sound kind of dumb but I curious. I have a Lenovo T400 laptop with an Intel T9400 CPU. Would it be possible to overclock my notebook? Would it be a really dumb thing to do? I would ...
3
votes
1answer
941 views

How do I attain safe temperatures for my new i7-2600 non-k?

I'm apparently having some cooling problems. I recently moved from a Core 2 Quad Q6600 on a P5K with 4GB and a Asus ATI 5770 running Windows XPsp2 Pro, to an i7-2600 non-k on a P8P67 (latest BIOS) ...
3
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1answer
870 views

How to calculate the setting for BCLK with Core i7?

Help me figure out the proper calculation for overclocking a Core i7. Given that: the default maximum memory speed is 1333MHz, the motherboard supports up to 2200 MHz by overclocking, and it has ...
2
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2answers
493 views

Why doesn't my computer work at full speed?

My motherboard is a Gigabyte GA-8I915PL-G with an Intel Pentium 4 630 3,0 GHz which doesn't run at it's default speed. It's currently at FSB 800, CPU Host 200 and CPU 3000 MHz; but sometimes it runs ...
2
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4answers
2k views

Is overclocking RAM worth it? [closed]

I am going to purchase a motherboard that supports up to DDR3 2400(O.C.). I have seen things saying that overclocking RAM is not worth it. Is it worth it to buy memory that is rated for DDR3 2400 ...
2
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2answers
96 views

Computer crashes

I just installed a new motherboard, cpu, ram, and a psu. I am having problems because my computer will randomly crash(restart) and I can't seem to associate it with any specific thing that I'm doing ...
2
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1answer
126 views

Higher voltage requirement for lower clock frequency

Is there any reason for a CPU to require a higher Vcore to achieve stability when running at a certain speed, than the Vcore that the same chip requires for stability when running at a higher speed? ...
2
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1answer
1k views

Why is GPU core clock cutting itself in half?

I'm using Afterburner to "natively" overclock a 7950, having used the "-xcl" option. From what I understand, this bypasses the need for unofficial Afterburner overclocking, and instead unlocks the ...
2
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1answer
55 views

Can I use an EVGA OC utility on a ZOTAC GPU?

EVGA has a very nice comprehensive utility while ZOTAC.. not so much. The specs for the two cards (EVGA vs ZOTAC) are not far off (660 Ti) so it seems plausible that one utility would work for the ...
2
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1answer
198 views

Prevent i7 from overclocking while on battery

I've been bringing my laptop to tutorials and lectures lately and I've noticed sometimes my CPU clocks up from 1GHZ to 3.2 GHZ which cuts my estimated battery life in half, and spins the fan up pretty ...
2
votes
1answer
464 views

overclock atom n2800 CPU

I have a netbook (EeePC 1025C) with atom n2800 1.86GHZ CPU. I tried to use SETFSB to overclock, but I can't find the required 9LPRS432AGLF clock generator. In the BIOS there is no overclock option ...
2
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1answer
6k views

Can I overclock an ATI Mobility Radeon HD 4250? If so, how?

Can I overclock ATI Mobility Radeon HD 4250? If so, how? My laptop is a Dell M5010 (aka 15R) with AMD Phenom II N850 69°C Caspian 45nm Technology, with 8GB Dual-Channel DDR3 @ 665MHz (9-9-9-24).
2
votes
1answer
2k views

How do I overclock a dual core processor?

This is a serious problem. I want to speed up my compilation process. I have never been especially fond of overclocking, however my current compilation time for my project makes my crazy! I found ...
2
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2answers
526 views

Adding extra fan on my setup. please advice on proper Exhaust or Intake of Fan

I modified my computer case so that I can add more computer fan to make my computer cool this summer. I need your thoughts on how I can improve my idea and I'm open to all of your advice. Status: ...
2
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1answer
518 views

Overclock when performance is needed, underclock when idle

I am using Ubuntu 12.04 LTS and I would like to know if I can underclock my CPU when my computer is idle, and overclock when performance is needed. Is there some sort of software I can install and ...
2
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3answers
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Overclocking: Is my gpu too hot?

I have a radeon hd 6670, and I have overclocked the GPU clock to 850 MHz and the memory clock to 1040 MHz. I then ran Diablo 3 with SpeedFan running in the background to check the heat of the GPU, and ...
2
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2answers
640 views

Undervolting & Overclocking the Llano A6-3400M

The AMD A6-3400M comes with a significantly higher stock voltage than is needed to operate stably. Has anyone tweaked and stress tested all the P-states to lower voltages? I've stress tested the ...
2
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2answers
507 views

Memory Overclocking

How do I overclock my system memory (DDR3 2000) to 2000MHz? I recently assembled a new system with the following memory and motherboard: Patriot Viper Xtreme 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 ...
2
votes
1answer
857 views

Underclocking a P4 to get a power-efficient NAS

I own an old Pentium 4 541 (3.2GHz Prescott) box which I want to convert to a NAS machine. As a NAS, it won't stress the CPU, and will probably sit idle most of the time. The problem is that P4's ...
2
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2answers
405 views

OC'd video card, now seeing artifacts

I overclocked my 5850 to 775/1250 (using AMD Overdrive) for maybe an hour. I don't think the temperature rose above the low 80's (Celsius, of course), but I started seeing artifacts so I put it back ...
2
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1answer
97 views

overclocking my first processor

So I've never overclocked before, but it sounds like you just change some settings in the bios @ startup and you're good to go. So I got some freeware called CPU-Z and it tells you lots of stats ...