# Overclocking an Aopen Mx 46 - Page 2

•  Subject
• Author
• Posted on

## Re: Overclocking an Aopen Mx 46

P4 clock timing creates a second clock from the base clock that is 90
degrees out of phase and sends data on the rising and trailing edge of
both. I.E.

So I was not far off here, even though it was a guess.?
___     ___
|   |   |   |
---     ---       base clock
___     ___
|   |   |   |
-     ---     --  90 degree phase

| | | | | | | |

data transfers

As I said the first time, define what "real" means in regard to the FSB.

Define what "true" means in regard to the FSB.

For a 333 FSB, the clock is 166.66... MHz and the (burst) data rate is
333.33... MHz. What makes 166.66... more "true" or "real" than 333.33...?
They're simply different things, albeit tightly related, and both are
"real" and "true" for what they describe. An E.E. might like to speak in
terms of the clock because he's designing circuits but the consumer simply
wants to know how fast the data gets there and, as the saying goes, I don't
want to design a watch just tell me what time it is. OK, it's high noon and
the FSB data rate is 333.

The situation is not unlike having both a tachometer and speedometer in
your car. What is the "true speed," 3000 RPM or 70 MPH? They're both
"true," depending on what your point of interest is, and related by the
gearing.

I'm
Cool, very much good info.

## Re: Overclocking an Aopen Mx 46

RaichuRaichu wrote:

I suppose so. 800 is twice 400 so that's "doing it twice" but the trick, of
course, is 'how' it's done twice as much. You can't just 'read twice' on
the original clock edge because there must be a timing delay for the
memory, and the bus, to respond. Hence the need for a phased shifted second
clock to determine when the next read will occur.

## Re: Overclocking an Aopen Mx 46

of
second
Makes perfect sense, other wise the memory wouldn't keep up @ all.
I've never really seen how far a P4 can really go.
I still have a good 3 or 4 GB difference between my P4 CPU and ram.
My P4 seems to race ahead of my ram, even when overclocking the ram.
Even @ stock speed, my 2.6c GHz (Northwood) is still much faster then my
Kingston Value ram (PC3200)
Hm, I think Intel was too fast to goto the 90nm tech here.
Overclockers like me have been taking the P4c's up to over 1,000 MHz bus
for years now.
2.60 @ 3.35 on water, had it up to 3,434 one time, but not stable.
:-D On aim, it's a really big smile.
The RavingRaichu.  Electric don't hurt you, if not too much hits you. :-)

333.33...?

simply
don't
and

## Re: Overclocking an Aopen Mx 46

RaichuRaichu wrote:

I don't know what that means.

Processors have been faster than the FSB ever since they first started
using multipliers.

DDR goes up to 575. That's 1150 dual channel.

## Re: Overclocking an Aopen Mx 46

The point I was trying to make is Intel should've tried to improve the
(Northwood) Core
before putting out the Prescott.
If overclockers can push the thing that far, then what says that Intel cant
find a way to just
make a chip that fast.
Anyways...
Laters..

:-)

## Re: Overclocking an Aopen Mx 46

RaichuRaichu wrote:

Well, for one, when Intel makes them they have to *all* work and over every
combination of the specifications from one extreme to the other, and not
just 'usually' and in your house.

## Re: Overclocking an Aopen Mx 46

of
trick,
on
my
bus
cant
every
=P   Very true.       ;-)              :-)
Cant argue with that.
Also making a note upstairs to what ever I want to call my brain.
You are one of the better ppl on this group.
RavingRaichu.     :-)

## Re: Overclocking an Aopen Mx 46

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

## Re: Overclocking an Aopen Mx 46

Many thanks Phil. I appreciate the time you took to make such an
informative reply, I've learned alot here.

Newfdog

Phil Weldon wrote:

## Re: Overclocking an Aopen Mx 46

As additional questions pop up, just post here again.  You are likely to get
good answers within a few days.  Some of the participants in this newsgroup
have been posting here for years - since the Celeron 300a lit up the sky.

Phil Weldon