|I can't overclock !|
There are many things that can be done to trick a stubborn CPU.
First off all if your computer don't even POST -you have gone to far - go back again!
Start with the first possible FSB above default ( increase FSB another notch if you suceed).. If you boot and get into Windows and experience programs takes forever to start - long harddisk activity. Then reboot - go into the BIOS setup/PNP,PCI & Onboard I/O Setup menu. Here you will find the PIO modes - set to auto by default. Try the different modes (PIO 4 is the highest). Disable UDMA. If the above doesn't help ; when in PIO mode 1 (and back in Windows) right click on the computer icon on your desktop,choose properties and go into devices.Find your disk stations and see if it is set to use (U)DMA - if it's ticked off or present - remove it and reboot. If it seem to be ok - adjust the PIO modes again for optimum performance. This applys if you are using Pci bus speed's above 33.3MHz. Already at ~10% (and in some cases even lower than that- depending upon the quality of the hardware) over default Pci speed can cause problems/failure of your peripherals. Mostly common is as said : extreme long hard disk activity - taking forever to boot into windows and programs to start..
Disabling L2 cache can be done for testpurposes - and I have done this to ensure that the L2 cache isn't the cause for not be able to use the desired FSB. Disabling the L2 cache causes a enormous performance drop off the CPU. If anybody tells you the opposite take a look at this test's I have done and which clearly proves this !
If you experience rapid temperature rising - try to remove the panels on your case. It is necessary to deliver as cold air as possible to the cpu fan. This can be done by a hose of adequate size that sucks air direct from outside. Try your system with and without panels - you probably will end up seeing a temperature decrease of 10'c with the covers off. If you want to keep your panels on - a high performance case fan is recommended - and preferably fans that suck out the hot air from the cabinet ( a lot off hardcore overclockers run their pc's with no covers - full time).
Random crashes when booting into windows or when playing Q3 or running Photoshop - then you most likely have a heatproblem / ram-problem / too high L2 setting or too low voltage. First try to adjust your core voltage and L2 latency. Adjust your SDRAM RAS-to-CAS DELAY, SDRAM RAS Precharge Time , SDRAM CAS Latency Time to lowest settings(3). If nothing of this helps and you are sure you have adequate cooling - buy a high performance Dimm.On some board's you can adjust PCI latency - too high PCI latency may also be the cause for unstability. If you adjust the Core-voltage higher - this produces more heat,and a decent cooler is more critical than ever. I have also done tests with peltier cooling of the chipset --and no doubt about it - this increases stability a lot at high FSB's.
Other causes for lockups can often be your AGP card (if you have a pci card -try it instead) -Experiment with the AGP aperture size (aperture is the amount of ram your video card utilizes / see) -most common settings are 64Mb. Start with 4.
There have been many reports of what is being called "burn-in effect". After running the CPU at an elevated voltage or even at the normal voltage while "exercising" the CPU (cycling CPU intensive applications), the processor somehow becomes more likely to run at the desired speed. The time required varies and it doesn't always work, but it's worth a try. If it doesn't run at desired bus, try lower bus preferrably at elevated voltage for a several days. Leave the computer on for several days straight. Give it a workout, then try it again at desired FSB. A good "burn-in" utility is CpuStabilityTester - You will find it in the Download section.There are two other (and free) programs you can use for burn-in purposes too ; SETI (search for extra terrestrial intelligence) and Prime95 (search for primes).
Try getting it to run after disabling the L2 cache in the BIOS (L2 should be disabled anyway for the C266 and C300 which have no L2 cache). Set memory delay settings to higher values ( normal setting is 2 for pc100 and 3 for pc66 ).Borrow a ram module and try it.
Sometimes a little extra voltage is all that's required to encourage your recalcitrant CPU to straighten up and fly right. You can adjust the voltage quite easily with in the BH6 BX6 BE6 SoftMenu. With the BH6/BX6/BE6 you can increase the voltage in 0,5 Volt increments. Put your system through its paces after each step. If it still crashes, bump the voltage a little more. You can fry your CPU by increasing the voltage too much. If voltage is your stumbling block, 2.3volts usually does the trick, though some have required as much as 2.8volts. The BH6/BX6/BE6 bios will not let you set the voltage higher than 2.3 volts without a special procedure - HERE IT IS - in plain text written for newbies ! All Slot 1 motherboards read the required CPU voltage through contacts on the SEPP (CPU board). Heat production increases when you increase voltage, so don't forget about needing more than ordinary cooling if you need to raise the voltage. One note of encouragement, there have been many reports of users being able to revert back to the normal 2.0 volts (or at least lower it) after a time and still maintaining stability (see the section on "burn-in" above).
Try different versions of drivers. Try new video drivers, try old video drivers, try Direct X 5.0 6.0 and 6.1 Remove all your cards except the video card. Disconnect the harddrive and boot from a floppy. If you have two DIMMS, try with each one individually. Borrow better, or at least different RAM. Use an old pci videocard instead of AGP card. Overclocking pushes your whole system to the edge. There is no predicting what device may be extra sensitive to slight timing errors, data errors or excess heat. Many of the new video cards, especially the AGP cards runs very, very hot. Be sure that video chip overheating is not what is keeping you from your desired speed - attach a cooler. If you find a card, harddrive or device that's keeping you from running at desired busspeed, you'll need to replace it. Since BX motherboards are designed for a 100 mHz bus speed, you are not likely to hurt the mainboard with speeds up to 100 mHz. The other components, however, can be negatively affected by bus speeds other than the standard speeds of 66 / 100 or the "new" 133MHz. At all other speeds the PCI and AGP clocks are higher than normal ( see the example for BH6 below ). Besides the obvious effects of increased heat generation, some peripheral devices are especially sensitive to timing problems when the PCI bus is over clocked. Some harddrives will trash your data if the PCI bus is clocked too high.
At 66MHz and 100MHz FSB you can set the Turbo option to ON which increases external clock speed by app. 2.5%. * 83Mhz and 124Mhz FSB is the worst speed for your pci cards
This is another example - default pci speeds is at 100.3 / 66.8MHz and 133MHz FSB - note the extreme pci speed at the upper 133MHz ( this bios allows you to choose between two different 133MHz FSB ). Also take note that if you choose a FSB of 124MHz you actually hit a lower than default PCI speed and this will give you a performance drop.
A great place to get help is the newsgroups !
Visit OcShoots discussionboard and post your questions there ( go here ) and get help from fellow overclockers !
In the newsgroups you will find others experiences and this is the best place to search for help if you get problems or can't overclock. Always remember to search trough the appropriate newsgroups before you post a topic - since there might be posted articles already regarding your problem. Read and follow the rules of netiquette and be polite and don't use a bad language - even if someone irritates you. If your behaviour is bad it is the fastest way too loose your internet access since the others can abuse you ( get you shut off)... Call someone a shithe... a couple of times - and if you are getting abused you will get a warning from your ISP (internett service provider). If there are terms that you dont understand at this site (i.e scsi fsb hdd dimm bios pci ram aso.) the best place to get this information is at Webopedia Please keep webopedia updated and contribute new terms if not listed.
Overclocking / hardware / processors :
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