Hi i am considering overclocking my celeron 800 but since i have never done this before i thought i should get some info from people who have. I currently have an Intel celeron 800 running on a Asus cuv4x-e mobo with 512 sdram and a Geforce 256 32 meg video. My bios seems to show that i can manualy change my settings to make overclocking a sinch but im not sure how high i can go without frying my system any insight would be helpful. Without order nothing can exist, without chaos nothing can evolve

It's all trial & error. The multiplier is locked so changing it will have no effect...all you can do is increase the FSB speed. If you have the option, lock the PCI/AGP at 33/66MHz, otherwise they will overclock right along with the FSB. If you don't have that option, your safe FSB settings will be from 66-75MHz if you have a 66FSB CPU, from 100-112MHz if you have a 100FSB CPU, or from 133-150MHz if you have a 133FSB CPU. Your RAM should be set so that it's speed is the same as the FSB. ASUS A7N8X-X Athlon XP 1800+ 8.5 x 200MHz 1024MB PC3200 2.5-3-3-7 Asus A9550GE/TD 128MB WinME/WinXP Pro SP2

If your motherboard has adjustable core voltage for the CPU, you should be able to change the frontside bus to 133 (8x133=1064). But you would (most likely) also need a better than stock heatsink to handle the increased heat. That would increase both clockspeed and memory bandwidth, for a noticeable improvement in performance.

You Celeron is definately one with 8x100MHz because the last 66MHz FSB Celeron ever build was the 766MHz one. That's what makes it a problem in your case because I'm not sire how far it will go. First of you need to know if your ram is PC100 or PC133 because the PC100 ram is only meant to run up to 100MHz while the PC133 ram is build for 133MHz. With PC100 ram you may run into problems with the ram which shouldn't happen with PC133 ram. On the other hand I never had problems with running my PC100 ram up to 112MHz and some even at 133MHz but you never know for sure if you try to OC it. If the system will not boot at sometime do a bios reset. Beter note all Bios setings before trying to OC so you wil be able to reset them later! It's possible that you need to set a special jumper to allow OCing by the bios on that board. Check the manual about this. Now raise the FSB in small steps of 3 to 5MHz or the smalles possible step if the settings you can choose are higher. Now reboot and run a benchmark program to see is the system is still stable and if the OC really makes it faster. With that older graphic card I suggest 3DMark 2000 or maybe 2001SE. If everything works well try the next step. If you run into graphic errors or other unstable situations see if you're able to raise the VCore. Do it only one step at a time. Always keep an eye on the CPU temperature which shouldn't go above 60°C! If you have different PC100 ram sticks and the system will no longer boot try them seperately to see if one is the problem. The PCI clock is usually the biggest problem with OCing those old systems because usually there is no pci lock and the pci divider is set automatically by the bios depending on the FSB. With 100MHz FSB the divider is set to 3 and somewhere near 133MHz FSB it will switch to 4. The problem is that most pci devices (including onboard components) will stop working somewhere around 37 to 38MHz. Normally you're safe up to 37,5MHz pci clock but above you run into trouble very soon. As already mentioned above you may go up to 112MHz but then no more. Depending on the board there might be settings above which already use 4 as a divider. Check your manual or the bios about that. Maybe its also possible to use jumpers instead on the board to do such settings. Those might be shown as 120/30 for example to show that the FSB will be 120MHz with a pci of 30MHz. The other problem with a high pci clock is the graphic card because the AGP clock is alwasy twice the PCI clock! I own a Celeron 733MHz myself which is 11x66MHz which makes it much easier to OC because you can go up to 100MHz before even PC100 Ram becomes an issue. I have abslutely no problems with running it at 1100MHz at 11x100MHz and even get it to run at 11x112MHz at 1232MHz. But in that setting I need to keep the CPU temperature at 40°C or lower because with 41°C it will just stop working. I also use or at least used PC100 ram in that system as I got some old ram lately and replaced the slower ones with PC133.