why so little info out there on Geode NX?

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I'm interested in using the AMD Geode NX 1500 or 1750 with
linux but I'm finding very few reviews or information
on how well it works.  Is the Geode just not very
popular?  I'm interested in a small pc for the desktop
that's nearly silent (the Geode NX 1500 can run fanless
with a passive heat sink) that's still pretty fast
(no gaming though).


Re: why so little info out there on Geode NX?

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AMD markets it as an embedded solution. The few vendors who
sell Geode, sell it bundled with a motherboard, implying
the terms of sale are OEM. And if you look at the bundled
motherboards, go to the motherboard web site, you cannot
even verify that the motherboard supports the processor.

So I'd say this is an "invisible" computing solution.
You only stumble onto stuff like this by accident.
Generally, you find NX 1750 bundles, but NX 1500 is
not so easy to find.


For these benchmarks, it appears AMD stuffed an NX1500 into
an Asus A7V8X-MX - but they're careful not to state which
BIOS version supported it.


And these benchmark comparisons are useless, because there
are no desktops to compare against.


This HP product uses NX1500, and total product power
consumption is 30W. (Thin clients - t5720) Again, I
could not find a benchmark!


You might be better off running a S754 processor at a fixed
speed like 1000MHz with lowered Vcore. (Download the motherboard
manual and make sure that frequency and Vcore can be adjusted.)


For example, MT-28 1.6GHz S754 Turion 25W max. $162
The biggest challenge with these, is they are lidless, which
means arranging the heatsink will be the challenge. Some rubber
bumpers or a shim, might be useful when mounting the heatsink.


Note the comment here regarding avoiding chipping the silicon
die on the Turion:


   "The MSI Mobile Pad (available direct from MSI) is a must have for
    putting a heatsink and fan"

Some of the higher end Turions are 7.7W at 800MHz, so you have
to keep the clock turned down, to meet your fanless target. This
doc doesn't have data for all Turions, so you are left to guess
at the numbers for the MT-28. (Pg.77)


Some tested motherboards.
http://angelfall.s39.xrea.com/area2ch/turion-e.html (MSI K8MM-V)
Built-in video OK, but the AGP slot isn't always a happy one.

A Zalman 7000CU is pictured atop a Turion here:

What you can do, is purchase a 7000CU, connect the fan, monitor
the temperature. Turn the fan down, while running CPUburn or Prime95
with the Turion running at 1GHz. If temps look good, shut off the
fan for a short period and see where the temperature goes. I expect your
PSU will still have a cooling fan, and you need that to keep the
computer case temperature down. You could try removing the
side panel of the PC, and rely on convection, but then you'll be
able to hear the hard drive a bit more.

One way to make silent powering solutions is here. There are
some DC-DC converters for example. You still need an AC "brick"
to provide the source of DC to run the convert. Basically, all
that this idea does, is spread the heat dissipation of the PSU
over more components, so it isn't a big saving. But if the
brick can handle the heat and is fanless, you have one less
fan. But unless you go whole hog, and use laptop disk drive
and laptop CD components, your case will still have some
other warm things that need some fan cooling. It takes
common sense, and an iterative approach to building the
PC, to get all that stuff done right.


Owning a good ammeter, some spare power harnesses, can help
a lot when you need to measure how well your new creation
is doing. I use this thing to measure power - it clamps onto
wires to make power measurements, but it is not the perfect
gadget, because it doesn't measure AC power consumption
properly when a computer is sleeping. This meter hates
non-sinusoidal power consumers. I use the 380947, set to
40A DC max scale, for measuring power draw on the ATX
power harness. A conventional meter is cheaper, but to use
an ordinary ammeter, you have to cut the wires and insert
the meter in series. These AC/DC meters use Hall Probe
technology, and sense the magnetic field around the wire,
to make the measurement. For example, you clamp the
meter around all four red wires on the ATX 20 pin harness
at the same time, to measure how much current is being drawn
from +5V by the motherboard. The magnetic field around
the four wires, adds together, so the total current is
sensed in just one measurement. Neat, but expensive.


By measuring the power consumption in advance, you would know
whether one of those PicoATX DC-DC converters would be
capable of powering the system. Owning a good ammeter
takes some of the risk out of purchasing a power solution.
You still need at least one conventional ATX supply around
as a "bench supply", for initial testing, tweaking, and

Have fun,

Re: why so little info out there on Geode NX?

On Sat, 13 May 2006 22:21:57 +0000, Mark wrote:

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The Geode NX is just a Tbred B core with a lower vcore and lower
clockspeed. Don't waste your time or money being sucked in by the games
they play with the part numbers/names. A duck is a duck by any other name.
There's absolutely no reason for a fanless cpu when you can use a fan
that can't be heard from 2 feet away. I've got 2 MythTV frontends running
on socket 754 Semprons. I didn't even change the fans on them. If I wanted
to run them fanlless, well, I wouldn't not when you can throw a 70->80mm
fan adapter on them and run an 80x25mm fan at 1500Rpm that you can't hear
from a foot away.

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Re: why so little info out there on Geode NX?

I should have included this link.


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Re: why so little info out there on Geode NX?

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The SiS741CX chipset supports the AMD Geode NX processor family, DDR266
front side bus, as well as high-speed DDR333 DRAM. Furthermore, the SiS741CX
chipset incorporates SiS's revolutionary HyperStreamingT Technology, which
provides multiple divided pipelines for data, allows data to be sent
concurrently, and separates data for easier memory retrieval, resulting in a
remarkable reduction in latency versus traditional chipsets. SiS964 /
SiS963L will be coupled with SiS741CX as the south bridge chipset, which
integrates with Serial ATA high-speed transfer interface. The SiS964 /
SiS963L supports Dual-Channel parallel ATA, 8 built-in USB2.0 ports, full
5.1 channel surround sound, V.90 modem and Ethernet network.


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