Archived from groups: alt.comp.hardware.overclocking (
More info?)
Many thanks Phil. I appreciate the time you took to make such an
informative reply, I've learned alot here.
Newfdog
Phil Weldon wrote:
> Your Pentium 4 1.7 GHz can be overclocked only by increasing the
> FrontSideBus speed. Unfortunately, a Pentium 4 1.7 GHz is a 'Willamette'
> technology CPU, and has little overclocking potential compared to its
> successor, the 'Northwood'. The 'Northwood' Pentium 4 CPUs are based on a
> faster, lower voltage, lower power technology and have a larger L2 cache.
> For example, a 'Northwood' Pentium 4 1.6A can fairly often be overclocked by
> 50%. Your Pentium 4 1.7 is much more limited.
>
> Generally a good indication of casual overclocking ability is the highest
> nominal speed CPU of the technology. For the 'Willamette', that is 2.0 GHz,
> while for the 'Northwood' it is 3.4 GHz. You can overclock your CPU by
> increasing the FrontSideBus speed, but don't expect much above 2.0 GHz. In
> other words, go ahead and try overclocking, but don't spend any money on
> extra cooling, etc. for your present CPU - it just isn't worth it.
>
> Unfortunately I don't have any overclocking links that seem to be current,
> but you should pretty much reach the maximum for your current CPU by just
> raising the clock speed (the clock speed is 1/4 the FrontSideBus speed.)
> Your CPU has a fixed multiplier of 17X, so raising the clock speed from 100
> MHz to 120 MHz (and consequently the FrontSideBus speed to 480 MHz) will
> give a CPU speed of 17 X 120 MHz = 2040 MHz. You should keep several things
> in mind.
>
> #1. Make sure that your PCI bus speed is not above about 37 MHz (nominal is
> 33 MHz.) A PCI bus speed over specifications begins to run the risk of data
> corruption when data is written to hard drives. If your motherboard has a
> FIXED setting for the PCI and AGP buses that locks the PCI bus to 33 MHz and
> the AGP bus to 66 MHz, use that setting for overclocking. (Usually, the PCI
> bus speed is 1/3 the system clock speed and the AGP bus speed is 2/3 the
> system clock speed, but chipsets for Pentium 4 CPUs have the ability to fix
> those bus speeds rather than using a divider.)
>
> #2. Before starting to overclock your older system, make sure the system is
> clear of dust and other thing that might restrict the flow of cooling air.
> Especially make sure the CPU heatsink fins are clean. Keep an eye on the
> CPU temperature when trying to overclock, and compare it to the CPU
> temperatures when not overclocking. In overclocking, you are trading the
> built-in stability overhead for higher speeds. Higher temperatures result
> from overclocking and higher temperatures reduce overclocking ability. Try
> to keep the temperature rise as low as possible.
>
> #3. Raise the system clock speed in small steps, in your case, say 5 MHz.
> Change nothing else. If your systems boots and starts the operating system,
> try putting a load on the system. If it is stable, you can try a higher
> system clock system. If it is not stable, you can try increasing the CPU
> core voltage by a small amount, say 0.05 volts ( in no case go higher than
> 0.15 volts above the default - it isn't justified for your CPU.) By going
> back and forth with these adjustmenst you will eventually find the highest
> stable CPU speed for your system.
>
> Most important of all: you will not destroy your CPU or motherboard from
> overheating, raising the CPU core voltage too much is an instant CPU killer.
>
> Hope this helps.
>
> Phil Weldon
>
> "Newfdog" <newfdog2nospam@warp.nfld.net> wrote in message
> news:cTy_d.973$Ln.45860@ursa-nb00s0.nbnet.nb.ca...
>
>>Hi all.... I have never tried overclocking before and thought I might give
>>it a try. I have an Aopen MX 46 motherboard with a P4 1.7GHz processor
>>installed. According to Aopen this board has lots of overclocking ability
>>but I don't really understand the translation on their website. Apparently
>>I can change the FSB speed in the bios. I also understand that Intel
>>processors are somehow locked, so what can I change to overclock this
>>processor? Is an increase in the FSB speed the way to overclock this
>>machine?
>>
>>Any info including relevant websites would be appreciated.
>>
>>Thanks
>>Newfdog
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