I've got Celeron 333@416MHz. If I try overclock more, the computer doesn't get started.
I've got 64 mt SDRAM DIMM, Soyo 6BA+ motherboard and Hercules Dynamite RIVA TNT AGP2x.
I haven't change the voltage. How can I overclock more?
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Overclocking is not recommended on most PC's.  This one is probably clocked as high as the manufacturer could get it.
When you overclock your system, you do just that...overclock your SYSTEM. Not just the CPU, but RAM, PCI bus, etc. Conceivably, you can overclock the processor as far as you want (until it gets hot enough to blow), and it will work the whole time (until it blows). But the other components won't necessarily act the same way.
I had an AMD K62-350 system that I couldn't get to go any faster than 400, until I changed the video card, then I could get it up to 450. At some point you hit a wall, where you just can't force it any farther.
You are currently running at 83Mhz FSB (in order to get 416Mhz=5x83, where 5 is your multiplier lock for the Celeron 333). At this high FSB, since your PCI divider is 1/2, your PCI components are running at 41.5Mhz, way beyond their 33Mhz design spec., so pushing your FSB higher is probably causing problems with them. Anything above 75Mhz FSB using 1/2 PCI divider tends to be problematic (my system runs at 75Mhz FSB, crashes at 78Mhz after a while).

Also your hard disk could be the limiting factor, not all HDs are created equal. Quantum Fireballs for example, are known to be o/c friendly, but not Maxtor.

If you want to go faster, go for the FSBs where the PCI divider is 1/3 (normally 92Mhz or higher). Now the problem is that at 92Mhz, your CPU will be at 460Mhz. Depending on your particular Celeron, it may or may not be able to handle such a high core frequency. This point is pure luck, I'm afraid. If you're lucky, it'll work. If not... then either buy another CPU or be satisfied with your current one. To help you reach this goal, you can try upping the voltage a small step at a time. If you succeed, let it "burn in" for a few hours/days, then you can try dropping it back down. My Celerons won't o/c until they were burned in for 24hours. Another important thing is cooling. Overclocking and raising CPU voltage all increases the heat output significantly. Make sure your heatsinks are capable and go for those aftermarket heatsinks like the GlobalWin FDP-32/FEP32, or the Alpha PFH6035. Intel's heatsinks don't cut it anymore once you're pushing that far out. Case cooling is also vert important. Get plenty of cool air coming in and also a way to exhaust all that hot air out.

Make sure that your AGP card runs as close to 66Mhz as possible, that's its design spec, and since all but one motherboard currently uses either 1/1 or 2/3 dividers for AGP, your AGP card may be set at 1/1 when you're running at 83Mhz. Change it to 2/3 when trying to go faster.

Hope this helps.

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PeteS073099Author Commented:
>To help you reach this goal, you can try upping the voltage a small step at a time.

How? CPU's voltage or main voltage, or what?
CPU voltage. You should be able to increase your CPU voltage 0.05V at a time (either in the BIOS or by jumper). Just increase it a notch and see if it works. Sometimes you may have to increase it up to 0.15V greater than the default setting. Be very careful though! As this will generate a lot of extra heat and can potentially permanently damage your CPU. Most Celerons that are overclocked tend to run at most, 0.1V above default. Any more than that and you start seeing super-cooling being used to cool the CPU (Peltiers, water-cooling systems, etc.) below room temperature.

Depending on how old your Celeron CPU is (newer ones are more overclockable, generally), you maybe able to run your CPU at default voltage after a burn-in period at a higher voltage (usually about 24hours will do, I burned mine in at 2.05V then brought them back down to 2.0V).
PeteS073099Author Commented:
>You should be able to increase your CPU voltage 0.05V at a time (either in the BIOS or by jumper).

There is no any voltage settings in the BIOS. How can I know what jumper must remove or move?
Have you got any pictures or something?
If there are no voltage settings in the BIOS, then it's done via jumpers. This will be different for each motherboard design, so you will need to refer to your motherboard manual. If you don't have it anymore, you might try Soyo's website to see if they have it to download. Most manufacturers I know have the manual as a download. Also, make sure you have the latest BIOS for the motherboard (get from Soyo's website) as that always helps, and sometimes you get more options in the BIOS.
PeteS073099Author Commented:
Thanks a lot!
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