Overclocking

[Godfather]

AMD Athlon XP 2800+ on a motherboard ASUS A7V600-X with 512MB 400 DDR.

I want to overclock my AMD, but I don't know how. And what's the maximum
overclock that I can do?

 

[Gareth Jones]

AMD Athlon XP 2800+ on a motherboard ASUS A7V600-X with 512MB 400 DDR.

I want to overclock my AMD, but I don't know how. And what's the maximum
overclock that I can do?

Unfortunately, you didn't buy an easy chip (unless its not multiplier
locked)
An XP2500 with a 333FSB is almost guaranteed to run as > XP3200 just but
increasing to 400MHz fsb
(with a fixed multiplier of 11, the actual clock frequency goes from
about 1.8GHz to 2.2 GHz)

The XP2800 however... hmmmm...... off the top of my head I don't know
what the multiplier is, but its probably 12, so a fsb of 400 is going to
give a real clock speed of 2.4GHz ..... you MIGHT be lucky, but this is
pushing it and you'll almost definitely have to up the voltage (I'd try
1.75v to start with and then work backwards to 1.7 or 1.65 if its still
stable) if it works at all.

Remember that if you do get it to work and it needs this higher voltage,
its going to need a good heatsink and fan to keep it running cool and
not crash.

--
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Personal email for Gareth Jones can be sent to:
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[mercury]

Athlon XP 2800+ on ASUS A7V600-X with 512 MB DDR400 RAM. Setting in BIOS
are:

CPU SPEED: 2083 MHZ
CPU FREQ. MULTIPLE: 12.5x
CPU EXTERNAL FREQ.: 166/33
MEMORY FREQ.: AUTO
CPU VCore SETTING: AUTO

Excuse my ignorance, but...Which of BIOS settings is the FSB? FSB = 2*(CPU
External Frequency)?
And how do I modify the settings in BIOS to obtain the maximum performance?

 

[Gareth Jones]

Athlon XP 2800+ on ASUS A7V600-X with 512 MB DDR400 RAM. Setting in BIOS
are:

CPU SPEED: 2083 MHZ
CPU FREQ. MULTIPLE: 12.5x
CPU EXTERNAL FREQ.: 166/33
MEMORY FREQ.: AUTO
CPU VCore SETTING: AUTO

Excuse my ignorance, but...Which of BIOS settings is the FSB? FSB = 2*(CPU
External Frequency)?

Yes, as the RAM is double data rate, the CPU frequency of 166 gives
166*2=333MHz FSB
If you change the CPU frequency step by step (167, 168 etc) then you
will speed up the processor, but also the PCI and AGP busses (as they
are derived by dividing the main clock by a certain value). To a point
this is good, but too much will cause anything hooked up to these busses
to crash.
However, when you reach 200MHz, the motherboard automatically configures
the chipset to use a different divider, thereby knocking the PCI/AGP
busses back to 33/66 MHz so all these busses will be stable again. 201,
202 etc will once again cause these to increase.

Therefore 200MHz FSB is a good thing to aim for.
Unfortunately, this means 200*12.5 = a CPU speed of 2500MHz.
Fantastic if you can achieve it (and not impossible) but its very
unlikely you'll get a stable system unless you increase the Vcore
voltage a fair bit and you keep it running cool.
Its worth a shot though.
Stick the CPU freq to 200
Vcore to say 1.75 (you might want to try 1.8)
If it works, try backing off the Vcore back to the normal 1.65v so that
it runs cooler and wont heat with extended use.

And how do I modify the settings in BIOS to obtain the maximum performance?

--
__________________________________________________
Personal email for Gareth Jones can be sent to:
'usenet4gareth' followed by an at symbol
followed by 'uk2' followed by a dot
followed by 'net'
__________________________________________________