Overclocking A-64

  • Thread starter Thread starter Christopher Rawlison
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Christopher Rawlison

Since this newsgroup is devoted to the A64 chips and architecture, I was
wondering if anyone knows of a good FAQ covering how to overclock the
A64 and the differences between ocing them and Athlon XPs.
 
Since this newsgroup is devoted to the A64 chips and architecture, I was
wondering if anyone knows of a good FAQ covering how to overclock the
A64 and the differences between ocing them and Athlon XPs.
Click to expand...

Like the newer XP's they are multiplier locked, so the only way to
overclcock them is to raise the system bus speed. It helps to have fast
ram and a newer chipset that locks the PCI bus.
 
Wes said:
Like the newer XP's they are multiplier locked, so the only way to
overclcock them is to raise the system bus speed. It helps to have fast
ram and a newer chipset that locks the PCI bus.
Click to expand...

That I'm familiar with, I'm just curious in regards to the HT bus and
dividers and such... From what I gather, your memory speed is set by a
divider on the HT?
 
That I'm familiar with, I'm just curious in regards to the HT bus and
dividers and such... From what I gather, your memory speed is set by a
divider on the HT?
Click to expand...

The newer chipsets support 1000MHz HT. Memory speed is set seperate on my
board, a SIS755 board, S755MAX. I'm not sure, but I think the slowest
memory bus speed I can select is 166MHZ, although there may be a 133MHz, I
can't think of any reason one would need that slow.
 
Thus spake Christopher Rawlison:
I'm just curious in regards to the HT bus and
dividers and such... From what I gather, your memory speed is set by a
divider on the HT?
Click to expand...

The host-clock is the important number; standard is 200 MHz. The
hypertransport links operate at an integer multiple of it, usually 4x
or 5x. The CPU clock is also an integer multiplier of the host clock.

The memory clock is derived from the CPU clock, with an integer
divider. An odd consequence of this is that for most CPU multipliers,
you can't run the memory at exactly 166 or 133 with a 200 host clock.
 
Wes Newell said:
Like the newer XP's they are multiplier locked, so the only way to
overclcock them is to raise the system bus speed. It helps to have fast
ram and a newer chipset that locks the PCI bus.
Click to expand...

So there's no bridge where you can convert them into a mobile? The CPU MSR
guy says that locked XP's are responding to the bridge connection and able
to be software multiplier changed, according to reports from users.

How about overclocking a 64 mobile? Guess nobody has tried that yet.
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So there's no bridge where you can convert them into a mobile?
Click to expand...

No. It a sealed top with the heat spreader.
The CPU MSR guy says that locked XP's are responding to the bridge
connection and able to be software multiplier changed, according to
reports from users.
Click to expand...
Yes, you can turn an XP into a mobile and use software to change the
speed. I'm not sure if this works on all chipsets though.
How about overclocking a 64 mobile? Guess nobody has tried that yet.
Click to expand...

You can overclock it with the FSB. The max multiplier is probably locked,
but i couldn't say for sure.
 
Wes Newell said:
Yes, you can turn an XP into a mobile and use software to change the
speed. I'm not sure if this works on all chipsets though.
Click to expand...
Right.
A very few can change the voltage too.
You can overclock it with the FSB. The max multiplier is probably locked,
but i couldn't say for sure.
Click to expand...
The one on newegg has no spreader - it looks like an XP. Hmm... no bridges.
Guess not.

--
Ed Light

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Ed said:
The one on newegg has no spreader - it looks like an XP. Hmm... no bridges.
Guess not.
Click to expand...


Sure it isn't a mobile? They do carry the mobile A-64s on newegg.
 
Christopher Rawlison said:
Sure it isn't a mobile? They do carry the mobile A-64s on newegg.
Click to expand...

Right. It's a mobile A64 with no spreader. A64. Looks like an XP - maybe we
can connect a bridge to unlock the multiplier. Oops -- no bridges.

--
Ed Light

Smiley :-/
MS Smiley :-\

Send spam to the FTC at
(e-mail address removed)
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