what athlon xp core and speed to get?

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i'm not actually overclocking,

I just got a flashy old athlon xp board with 4 ram sockets and 5 PCI

It's labelled Abit KX7-333   So I guess it supports  up to FSB 333

is barton the latest core for the athlon xp? and will its temperature
be less than 45 degrees? I don't want the fan to get too loud.

I guess I want an Athlon XP 3000+ (333)
                         or Athlon XP 3200+ (333) will do


ps- is there a better list than that? it's fantastic!

Re: what athlon xp core and speed to get?

jameshanley39@yahoo.co.uk wrote:
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The Wikipedia article seems to be using max powers, rather than typicals.
The 3200+ FSB400 here (PDF page 37), is listed at 60.4W. There are other
datasheets on the AMD site, or you can use one of the tables I posted (which
I copied from the QDI site a while back).


XP Model 10  2200 (3200+) OPGA 200 512   11x   1.65V 85oC 60.4W
Barton       2100 (3000+) OPGA 200 512   10.5x 1.65V 85oC 53.7W

XP Model 10  2167 (3000+) OPGA 166 512   13x   1.65V 85oC 58.4W
Barton       2083 (2800+) OPGA 166 512   12.5x 1.65V 85oC 53.7W
              1917 (2600+) OPGA 166 512   11.5x 1.65V 85oC 53.7W
              1833 (2500+) OPGA 166 512   11x   1.65V 85oC 53.7W

We can look at this with some example math.

This is a cooler that is compatible with S462. I don't know if there
are any good monster heatsinks like this, that also quote theta_R, so
this will have to do. Theta_R is 0.20C/W at full fan speed.


If room temperature is 25C, and a well cooled computer case interior
is just 7C warmer, at 32C, then the temp difference you want to work
with is 45C-32C or 13C. That is a pretty small diff. And if the room
warms up, so does everything else.

To compute the CPU temp, we work with the computer case temp and
add the effects of the CPU heat, as in:

CPU_temp = 32C + (0.20C/W * 60.4W) = 44C

So, it looks like we have a winner :-) The Zalman 7000B-Cu and a 60W
processor, just barely meet your criterion. The fan plugs directly to
the CPU fan header and the fan has to run full speed, to meet the
temp. If you can find a cooler with a better theta_R, that also can
be mounted on a S462 motherboard, then you may be able to do better
than that.

I use a Mobile (AthlonXP-M) on my Nforce2 board, but that processor
still has to run at 1.65V to be stable at 2200Mhz, so I doubt I'm saving
significant power. I got a Mobile on the theory that the multiplier
is unlocked, so offered more possibilities during setup.

If you drop the frequency, then you may also be able to drop Vcore a
bit. But that defeats the whole purpose of your question, which was
a performance upgrade.

By the way, I downloaded the manual:


    (PDF Page 5) ... 266MHz Athlon System Bus

I'm not sure that you should be shopping for a FSB333 processor,
at least until you can find a CPU Support chart for the board.

In the BIOS releases here, they mention 2400+ and 2600+, making
it sound like it is limited to FSB266 processors. I'd check that
before you buy a processor. The 2600+ at FSB266 was hard to find,
even when the processors were being produced.


XP Model 8   2133 (2600+) OPGA 133 256   16x   1.65V 85oC 62.0W
Thoroughbred 2000 (2400+) OPGA 133 256   15x   1.65V 85oC 62.0W

Maybe you could ask for clarification on the Abit group.


Re: what athlon xp core and speed to get?

Paul wrote:
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many thanks for all your research into this. I will check with abit
regarding the FSB issue.

I may underclock it. I don't want the fan running that fast.

Being interested in not running fans fast, I have tried quieter HSFs,
like the - rather wide - zalman flower cooler(80mm and the wider
120mm), the scythe(a tall unit).  Unfortauntely, I have a bunch of
cases that are very nice - screwless chenbro cases. Except, they are
too narrow to take the quiet tall heatsinks, and they can't take the
zalman flower cooler heatsinks either, because the CPU socket is close
to the PSU. ('cos the  holes on the computer case for the MBRD to screw
in, are such that the MBRD is high up in the case, and so the CPU
socket is right up close to the PSU unit)

I have a p4 northwood core processor 2.8GHz, and another 2.4GHz. Socket
478.  FSB 533(133x4). i guessed that AMD Athlon XPs of similar speed
wouldn't be much hotter - if at all.

My P4s , one is 2.8GHz, the other is 2.4GHz, both are northwoods. In
identical cases with identical HSF, case fans and PSUs.  The 2.4GHz one
has 2 HDDs though.  For some reason the p4 2.4 runs a lot hotter.

The 2.4GHz runs at  30c (according to speedfan, 3 sensors report
30c,23c,23c so I guess 23c is the case. 30c must be cpu)

The 2.8GHz runs at 39c (according to speedfan, there is 35c and 39c, I
guess the case is 35c)

CPU fan runs at 2100RPM,  is a thermtake A2144.
one case fan runs at 1650RPM. And there is another case fan.

I guess the mystery in temp difference may be to do with the difference
in case temperature 'cos a P4 2.4 isn't supposed to run hotter than a
2.8  Unless maybe variation like that is typical even between 2
identical processors.

But the main thing is, I'd have thought that an Athlon XP would be
easily cooled as cool as a p4 though. Even looking at the maximum

If my hotter p4 runs at 39 degrees, then wouldn't an Athlon XP of
equivalent speed run at the same or a lower temp?

According to intel's processor finder / processorfinder

p4 2.4  57.8W
http://processorfinder.intel.com/List.aspx?ProcFam=483&sSpec=&OrdCode =

P4 2.8  68.4W

I don't know if that's maximum wattage or not. But judging by the
wattages, they don't look higher than the AMD Athlon XP. So my half
monsterous Thermaltake A2144 HSF should cool them to 40c or less at
2000RPM, as it does my P4s.

The Thermaltake A2144 works on P4's socket 478, and AMD's Socket A/462.
So I can use it.

Re: what athlon xp core and speed to get?

jameshanley39@yahoo.co.uk wrote:
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Well, the power numbers are pretty bogus, in their ways. Sometimes a group
of processors all have the same power rating, meaning the power number is
a "boiler plate" number, and not a characterization.

If you had something like this:

    2.4GHz  75W
    2.6GHz  75W
    2.8GHz  75W
    3.0GHz 100W
    3.2GHz 100W

you'd know that the 2.8GHz was probably truly 75W, while the slower
ones were not. And the 3.0GHz in that example, is probably less than

The stepping could make a difference. Maybe a 2.4GHz B0 draws more power than
a 2.8GHz C0. You have to study the trends and compare like to like, to detect
whether some critical part of the technology has changed.

Geometry can affect power. In a perfect world, 65nm would draw less power
than 90nm, and 90nm less power than 130nm, and so on. But for some time now,
the designers have been fighting leakage currents. The Prescott was pretty bad
for that, and while I'm not sure of the exact figure, maybe 25% of the power
was wasted in leakage. The other 75% of the power would be frequency dependent,
the way good CMOS should be. CMOS used to be quite predictable on power, but
the leakage started to creep in as the geometry shrunk. Now the gates are
designed differently than they used to be, with extra transistors added to
modify the leakage behavior, and shut down sections of circuits not being used
for an instant.

If you look around, there are processors that draw in the 35W neighbourhood.
There are even laptop processors at 21W. All of which would give an effective
desktop experience. But the motherboard for some of those solutions could be
more expensive. Or the processor could be hard to find.

For example, amdcompare.com lists this one. It is a dual core running at
2GHz on each core. But I don't think you can buy one.

ADD3800IAT5CU    ADD3800CUBOX    AMD Athlon64 X2 Dual-Core    
    3800+   2000Mhz   SocketAM2  35W

    ("This Product is Not Available")

There is also a single core rated at 35W.

ADD3500IAA4CN    ADD3500CNBOX    AMD Athlon64
    3500+   2200Mhz   SocketAM2  35W

Those would run cooler than the old AthlonXP's. And you could use an ordinary
socket AM2 board with them.

To get back to the S462 for a moment, you could use a 35W or 45W mobile
AthlonXP-M, but your motherboard needs to support a few things. With
absolutely no support for a mobile, the multiplier will be stuck at 6X
or so. The motherboard has to have the ability to set the multiplier
(and some boards do this with a tiny "overclocking" chip, a chip
with some GPIO signals for driving the multiplier bits). If a motherboard
cannot drive the multiplier signals, then you need to use "wire tricks"
installed into the socket (or soldered to the back of the motherboard).
Also, for best power characteristics, you want an adjustable Vcore.
Some Asus boards, for example, the BIOS won't allow adjusting the Vcore
very low. The ultimate solution is to manually wire the VID signals, so
you can get the voltage you want. So using a mobile can result in a lower
power solution, but a good motherboard makes all the difference as to
how easy it is. (And you don't really want to solder to the back of
the socket, for fear that the plastic might melt and the pins shift
a bit in the socket area.)


Re: what athlon xp core and speed to get?

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You know that Abit board didn't "officially" support a 333fsb!

I still have one on the "dusty" shelf somewhere... and can't remember if
there were any issues running it at 166x2.
I think there were 2 revisions of the board tho... maybe something about pci
clocks out of spec on the earlier ones?
I switched to Asus after that board...

I have experienced good results with the "Zalman" brand of coolers.
Good luck

Re: what athlon xp core and speed to get?

fast_eddy wrote:
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yeah, I was going to post that I checked the manual paul linked to.
Seems to be referring to the DDR.
FSB 266(133x2). DDR 333.
misleading marketting.

Re: what athlon xp core and speed to get?

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yep ... I have that same board. It runs fine with an XP 2100+ and PC2700
DDR... couldnt get my barton 2500+ to be stable in it.

Re: what athlon xp core and speed to get?

NuTCrAcKeR wrote:
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what did it do when the processor was unstable?

fail a prime95 test ?  

or , cause which interesting errors?

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