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05 November 2000

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Overclocking FAQ

 

 AMD Processor Information   Intel Processor Information 
 Cooling Tips  Building an Overclocking Machine
 Overclocking Newsgroup  AMD Overclocking Newsgroup

 

Looking for Answers? Read this FAQ first and hopefully you will find a quick answer to what you are looking for. If you read this and are still not sure, then by all means post a question on the Overclocking Newsgroup . This is not meant to be the end of the line for all your questions, just a beginning to help you get started. I have included many links to sites that will explain certain subjects in much more detail. You don't need to know every detail of how a computer works, but you will need to know the basics, like how the CPU, AGP, PCI, and Memory Bus speeds are calculated.

Before you begin this FAQ, write down the specifications of your system - CPU, motherboard, memory, operating system, bus speeds, voltages, and temperatures. If you don't know some of these specifications, perhaps this FAQ will help you find out. If, after reading the FAQ, you still have questions, please include these system specifications with any questions you post. Include what have you done so far - voltage adjustments, cooling changes, etc. The more information you can give, the better your chances of getting a reply that can help you out. Also post a reply and let us now if you got it working and how you did it. Someone else may have the same problem and might be monitoring your post to see how you fixed the problem or if the suggestions given helped.

Most of my experience is with Abit and Asus motherboards and Intel CPU’s, so don't think I am biased, I am just listing what I know about. I have overclocked a few AMD and Cyrix systems also, but not many of the newer ones. The good folks in the AMD Overclocking Newsgroup have all the experts there. BUT PLEASE read this no matter what type of equipment you have!!


FAQ's

 

Q: What is overclocking?

A: Overclocking is simply running hardware (such as a CPU or Video Card) at a clock speed higher than what it is rated for. Sounds simple but there is much to learn and there are many many good sites that can explain this better than I can. You need to learn as much as you can before going any further. Overclocking can damage your CPU or other system components if you don’t know what your doing! If you want to do this successfully, then you need to put a little time and effort into it. 

I suggest reading over the following sites. They will give you a good explanation of what overclocking is all about. Some of the sites are a little old, but the basic information still applies. 

Overclockers.com - Beginner Guides

AnandTech - Overclocking Guide

Tom's Hardware - The Overclocking Guide

Also read this - Building an Overclocking Machine

  

Q: Will overclocking damage my CPU?

A: If proper steps are taken to cool your CPU, then overclocking will not damage your CPU. It may in some cases shorten the lifespan depending upon the amount of heat your CPU is subjected to. You can fully expect your CPU will be obsolete by the time it burns out!!

 

Q: I have a ‘name brand’ (Dell, Compaq, Gateway, etc..) computer, can I overclock it?

A: In most cases, No! You’ll have to see if there are jumpers on the motherboard or settings in the BIOS to change the CPU bus frequency. If not, forget it!! Next time by a ‘real’ computer. <- that was a joke, ha-ha, get it?..

 

Q: Can I overclock a Laptop?

A: There may be some minor instances when you can, but generally NO! Overclocking creates more heat than what the stock setup is designed for and there is no way for the extra heat to escape. Even if you could get it to run stable, the extra heat would turn the laptop into a hot plate. Personally, I would not attempt this!!

 

Q: Why can’t I change the Multiplier on an Intel CPU?

A: All of the Intel CPU’s for the last few years (from 100Mhz and up) have been ‘Multiplier Locked’. This means you cannot change the multiplier no matter what you do, no way, no how, forget it! Some CPU's will actually use a lower multiplier if you try to increase it. You will have to adjust the FSB (Front Side Bus frequency) in order to overclock. There are a few CPU's that were manufactured before Intel started the locking process, and occasionally an engineering sample slips out without a locked multiplier, but the chances of getting one are very slim. You can try it, but don't expect it to work.

AMD is now starting to do the same, but there are some CPU’s or motherboards that can be worked on to change the multiplier. There are many reviews out there about this. See some of the sites listed below.

  

Q: My system is just not stable (crashes or locks up) when I overclock my CPU!

A: There are many factors that can cause this:

  • The biggest factor is needing to increase the CPU Core Voltage. In General, you can safely increase the core voltage up to 0.30v higher than the default voltage. It is best to read up on the latest reviews about overclocking a specific CPU to find out what others have done and what is the suggested maximum voltage to use. Here are some limits you should stick too for some Intel CPU’s, some people have used higher but this is the safe zone…

  1. PIII Coppermine and Celeron (newer, Coppermine Core) -- 1.90v

  2. PIII Katmai -- 2.3v

  3. Celeron (original, Mendocino Core) -- 2.3v

  • Overheating - An inexpensive way to check if heroic cooling will help overclocking stability.  Use a can of "freeze down" electronic component cooler. Spray the coolant directly on the CPU.  A $6 USA can  (about 14 ounces) is enough to  keep an Intel CPU well below 0 C for 5 minutes while operating under load. Most good electronic supply houses will carry it.  Radio Shack also has "freeze down"; Cat. No. 64-4321 "Component Cooler", but the Radio Shack price is $6.99 for only 4.5 ounces. Thanx to Phil Weldon!

  • PCI or AGP bus running to fast. Keep the PCI bus as close to 33Mhz and the AGP as close to 66Mhz as possible. Too fast can cause other components beside your CPU to freak and lock the system. This is all dependent on the PCI and AGP dividers being used. For Example – 133Mhz FSB x 1/4 PCI Divider = 33Mhz

  • Poor quality memory, or memory just not made to run fast. High quality PC133 is recommended for a good overclocking system. You can use PC100 memory if your sticking with low FSB’s 115Mhz or lower.

  • Update your BIOS and drivers for all your system components!!

 

Q: My Motherboard doesn't have any core voltage adjustments, how can I change the voltage (Intel CPU's)?

A: If you have a Socket type motherboard, there is a procedure you can do. Check this out, but beware, it is risky if the wire comes loose, so be careful!!!!

Hard OCP - BUMP THAT VOLTAGE 

Overclocking FC-PGA processors in all mainboards - Thanx to Peter Dassow!

If you have a Slot 1 type motherboard, there are two things you can do:

  1. If your using a Slot 1 board and a Slotket, you can use a Slotket that has voltage jumpers on it to set the voltage. This will change the voltage signals to the motherboard and make it think the default voltage is higher.

  2. There is a way you can tape the pins on a Slot 1 CPU or Slotket to alter the voltage signals. Follow these links for a good explanation of this procedure... (The PIII Slot1 pinouts are the same as the Celeron and PII)

            http://www.geocities.com/celeron_overclocker/voltage1.htm

            http://www.3dhardware.net/features/slot1voltage/index3.x 

Here are the additional voltages needed for the Coppermine CPU's 

VID4 VID3 VID2 VID1 VID0 VCC core
0 1 0 1 1 1.50
0 1 0 1 0 1.55
0 1 0 0 1 1.60
0 1 0 0 0 1.65
0 0 1 1 1 1.70
0 0 1 1 0 1.75
0 0 1 0 1 1.80

 

Q:  I can’t get higher than 1.70v for my core voltage in the BIOS? 

A: Most motherboards limit the adjustment you can change the core voltage too. You can set the Slotket to a higher voltage if you are using one. 1.70v for example, and the Motherboard will think the default core voltage is 1.70v and allow you a higher range of settings. Or you can use the BIOS flash trick as listed on some of the Abit Motherboard sites below. I stole this part from the BH6 site, Thanx to Luke Carroll!

- Set the voltage in the bios to the max you can get, i.e. 1.7v. Follow the bios flashing instructions in Bios Info, but type 'awdflash /cc bh6_xx.bin' to use the /cc parameter. 

That is for an Abit BH6, but it works for other Abit boards also. Just substitute the BIOS version in where it shows bh6_xx.bin. Read your manual or go to the motherboard manufacturer's site for more info.

 

Q: I flashed my BIOS with the wrong version or something went wrong and now my board is dead!

A: Your BIOS is probably scrambled, here are a few solutions:

  •  Try clearing the CMOS with the jumper on your motherboard. This probably won’t work, but it’s worth a shot. 

  • You can order a new BIOS Chip from the motherboard manufacturer or from a place like http://www.badflash.com/.

  • There is a process called ‘hot swapping’ where you can swap BIOS chips with a board that has the same chip as the hosed one, flash it, then pop it back into your motherboard. The site for the BE6-II below explains this more.

 

Q: How can I check the temperature of my CPU?

A: All the Pentium II, III, and Celeron CPU’s have a diode built into the CPU that can allow the motherboard to sense the temperature of the CPU.

I think a few of the new AMD CPU’s have a sensor for monitoring the temps, but most of the older ones don’t. Please post if this is not correct or if you know exactly which do!

Your Motherboard must support this feature also. The best way to tell if it does is look in the BIOS for a CPU temp listing. You can use a program like Motherboard Monitor or MB Probe to check the temps while running Windows.

 

Q: How hot should my CPU be?

A: The temp limits shown by AMD and Intel are the absolute limits that the CPU can handle before it is destroyed. This is by no means a guide to go by when looking for a normal operating temperature! If your CPU were to even approach 80C it would most likely lockup before it destroyed itself. Most CPU’s (under idle conditions) should not be running above 50C (122F). 40C (104F) is a good temp to shoot for. Obviously, the cooler the better. A cooler running CPU will last much longer, and lessens the chance of crashing the system.

Your system (motherboard) temp should be fairly close to room temperature, within 5C (9F) degrees or so. If the system temp is higher than that, try adding more case cooling (see below).

 

Q: My CPU seems to be running hot! What can I do? (Cooling Info)

A: There are a few things to look at:

  • Remove the HSF (Heatsink/Fan) and make sure you are using a thin film of heatsink compound. This is easily found at Radio Shack or other electronics stores. Thermal pads are not as good as compound!!!!

  • Be sure you have good case ventilation. It will do you no good to have a good HSF setup but nowhere for the heat to go! You should have at least 2 fans exchanging air in your case. One blowing in (normally in the front of the case), one blowing out (the power supply fan can be one). Be sure and try to balance the amount of incoming and outgoing airflow, or have enough vents so air can escape or enter the case freely. 

  • Check to make sure the HSF is fitting on the CPU properly. Some HSF’s don’t fit to well on the FC-PGA CPU’s, they can tilt to one side or the other. Most Socket-A CPU’s (T-Bird, Duron, etc) have little cushions to help stabilize the HSF on the CPU.

  • Get a better HSF. Alpha, GlobalWin, and Thermaltake (Golden Orb) are all good names to look for. If your HSF is not good enough, then the only way to cool off is to upgrade. A Peltier setup is also an excellent way to keep your CPU temp way down.

  • Read my Cooling Tips page.

Q: What is thermal grease/compound? How do I apply it?

A: Thermal grease/compound/paste is a substance that promotes the conduction of heat between two surfaces by filling in small imperfections in the materials that would otherwise create an air gap. It is not nearly as effective as touching metal to metal, but is a better heat conductor than air. You only need to use a very thin film to fill the small gaps. 

This link has a good explanation - The Heatsink Guide: Thermal interface materials

 

Q: What is a Peltier?

A: Peltier devices, also known as thermoelectric (TE) modules, are small solid-state devices that function as heat pumps. Go to these sites http://www.tellurex.com/ , http://www.peltier-info.com/ for a complete explanation. Keep in mind that for the best cooling, the heatsink for a Peltier CPU cooler must handle THREE times as much heat as the CPU produces. 

Here is a good site that tril0Byte has put together on his Peltier cooling quests - tril0Byte's Overclocking Homepage

 

Q: How far can I expect this CPU to overclock?

A: Here are some typical max speeds you can expect:

  • Intel Celeron, original Mendocino Core, 533 and lower - 590-600Mhz

  • Intel Celeron, new Coppermine Core, 533a and higher - 900-950Mhz

  • Intel PIII Katmai - 600-650Mhz

  • Intel PIII Coppermine, cA2 Core - 800-850Mhz

  • Intel PIII Coppermine, cB0 Core - 900-950Mhz

  • AMD K6-2, newer CPU's - 550-600Mhz

  • AMD K6-III - 450-500Mhz

  • AMD Duron - 900+ Mhz

  • AMD Athlon - Varies a lot!, check the database.

You can also check out Overclocker.com's CPU Database. The average speed will give you a good idea of what you can expect. Always remember not all CPU's are created equal! Some overclock very easily and some just won't do it no matter how hard you try. It's luck of the draw, but you can increase your chances by reading up on the latest news and buying a CPU that has the best reputation.

  

Q: What is Stepping? How do I tell what core a CPU has? (CPU Information) 

A: Intel's definition - Tthe “stepping” number indicates design or manufacturing revision data for production Intel microprocessors (e.g. Stepping 4). Stepping is used to indicate a “revision”. By using unique steppings, it facilitates change control and tracking. Stepping also allows an end user to identify more specifically which version of the processor their system contains. This classification data may be needed by Intel when trying to determine the microprocessor’s internal design or manufacturing characteristics.

SO... Stepping is the Core revision of a CPU. It is always best to try and get the latest core revision. As improvements are made in the core, it allows the CPU to run at faster speeds. 

For additional information, see these pages..

AMD Processor Information

Intel Processor Information

 

Q: Is ‘this’ CPU faster than ‘that’ CPU? (PIII vs. Celeron vs. Athlon vs. Duron)

A: Check out the reviews at the many sites dedicated to testing computer hardware. They give excellent info and easy to read charts on just about any CPU your thinking of getting. Anandtech is a great place to start, look for the CPU reviews. Remember, the CPU is not the only factor in determining how fast a computer will run. If the Video Card or other components are crap, your overall performance will be crap.

 

Q: Can you recommend a Motherboard or CPU or System for overclocking?

A: This changes almost weekly! The best thing you can do is go to the hardware review sites and READ the latest reviews. This way you can learn the latest info faster than you could get a reply on the newsgroup. Also do some comparisons of prices and how far each CPU can overclock, this will tell you what the best value is. If you want a system that will be exactly what you want, then YOU need to make the decision and not base it on others opinions.

Here is a step by step of how I built my last machine. This may help you to make decisions of what to look for.

 

Q: How can I test an ATX power supply or manually turn it on to use it as a power source?

A: You need to tell the power supply to turn on. This is done by the motherboard when using an ATX power supply. So if you can send the signal to the power supply manually, you can turn it on using the same pin as the motherboard uses.

The pin is the Power_On pin, not the Power_OK or Power_Good pin. There is no specification as to color of the wires, but the Power_On pin is pin #14. The motherboard turns the power supply on by toggling the signal to this pin #14 to a low level.  Ground will do, so connecting any of the ground pins on the power supply connector to Pin # 14 will do (Pins 13, 15, 16, 17, 3, 5, and 7 are Ground or Common.)

The motherboard is able to toggle the level of this signal when the front panel ON switch is pushed. This is possible because, for an ATX power supply, the Standby + 5 volt line is always powered as long as the power cord is plugged into AC power.

The Power_OK or Power_Good Pin is pin # 8, it is a signal FROM the power supply that tells the motherboard that the voltages are ok.

Since the ATX and AT power supplies are switching power supplies, it is sometimes necessary for a significant amount of current to be drawn from the + 5 volt line; else the + 12 volt line will not be regulated and will supply very little current and even that at a low voltage.  If you have such a power supply, it is necessary to put a 10 to 20 watt dummy load between one of the + 5 volt pins (19, 20, 4, or 6) and one of the Ground pins.  Thanx to Phil Weldon!

 


Tips

  • If your looking for information on something like a Motherboard or Slotket or any piece of hardware and don't know who makes it.. Use a search engine! Almost every piece of hardware has a model number or some way the manufacturer identifies what it is. Just write down any numbers you can find printed on the circuit board (or on a sticker) and put the numbers into a search engine. You can find all sorts of info this way. You can use any search engine you want, but my favorite is Dogpile. It searches multiple search engines at once.

  • I’ve seen this misspelled all different ways so I thought I would throw this in too…. 

    Slotket = Slot to Socket adapter = SLOT + socKET

 


Hardware Review Sites

Anandtech

BX Boards

Hard OCP

Overclockers.com

Overclockin.com

Sharkys Extreme

Toms Hardware Guide

 

Manufacturers 

AMD CPU’s

Intel CPU’s

Abit USA or Taiwan

Asus USA or Taiwan

Chaintech

MSI (Micro Star)

Soyo

CompInfo MANUFACTURER Directory 

 

Motherboard FAQ Sites

(Post a reply if you know of any additional FAQ's)

Abit KA7

Abit BH6

Abit BE6

Abit BE6–II

Abit VT6X4

Abit BP6
 

Popular Shareware

H.Oda!'s  - CPUID (reports CPU type, speed, etc..), SoftFSB (allows you to change the FSB from windows), and other CPU utilities.

SiSoft Sandra - Benchmarking and System information utility.

Intel® Processor Frequency ID Utility, AMD Processor Utilities - CPU information (reports CPU type, speed, etc..)

Motherboard Monitor, MB Probe - Reports temperatures and voltages from your motherboard and CPU.

PowerStrip - Video Card overclocking utility and more..


A big THANK YOU goes out to all of you that have given your suggestions and great ideas to help this FAQ grow!! 

I will try my best to keep this going as long as possible and keep it up to date. As always, I welcome your suggestions, ideas, and criticism to keep this FAQ growing. If you see something that is incorrect or have more information on any subject, don't hesitate to post a reply or drop me an email!! 

But, Please DO NOT email me with a problem or question! There are many people who have more experience than I do that frequent the newsgroups daily that may be able to give you a better fix or explanation than I can. Post all your questions on the newsgroups!

 

Created by Bill Hillman

Copyright © 2000. All rights reserved.
Revised: November 05, 2000.

 

 

 

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