Warning: If you are
here then you agree that I cannot be held at
fault should you damage your hardware as this is
untested/unproven content.
Ok...... Now on with the info! This is a super
short super simple mod guide to turn a ICST
9250-10A into a 9250-10B. I have long known
there is nothing different about the two and
that both were really the same chip.. only that
A had support for 66-88MHz and B for
100MHz-133MHz.. while looking over the papers
today I noticed the super simple thing that said
if the chip was to act like an A or a B. This
will work for all motherboards using this PLL-IC
and is very simple. If this is used along with
the HIP6021 DC/DC Converter on an Trigem
Cognac/Cognac+ Anaheim2/2a/3 or any other
motherboard with both the ICS 9250-10 PLL-IC and
Harris HIP6021 DC/DC Converter
make for one hell of an overclocking
combination. This may also fix the problem with
some older cognac's that seem to not to want to
auto-select the 100MHz FSB when a 100MHz FSB CPU
is placed into the motherboard.
Note(1): Cognac+ support isn't official. I'm not
sure if Trigem used the same PLL-IC (Clock
Generator) and/or DC/DC Converter as the
Cognac... However I do believe they did. If you
own a Cognac+ Please check and let me know.
Update(1): Id like to report that the Cognac+
does in fact use this PLL-IC.
Note(2): I see a small mistake and I'd like to
fix it. Its not with the info but how I labeled
something.. when I say "9250-10A" and "9250-10B"
the A/B doesn't talk about a revision number but
the "naming" guide SMB software that accesses
the pll-ic use.. they call it "A" when FS0 is
set
to 0 and "B" when FS0 is set to 1.. sorry for
any confusion I might have caused.. however all
the info is still the same.. So just note than
when I say A/B I'm referring to the setting of
FS0 and not to a revision number.
Tools Needed:
1x Soldering Iron
1x New very small/fine tipped solder tip
1x Some solder lead
1x 10K Resistor. If you don't have a 10K
resistor around, something close to it should
work.
1x Something small enough to pull on the small
pin of a SMD chip.
Small wires or something to connect pins.
Some free time.
Before doing this you should remove the
motherboard from the case and remove everything
from the motherboard (such as cpu and ram and
such) just to be safe and for extra free space.
Make sure you're discharged of any static
electricity and wear an anti-static wrist strap.
It should be noted I haven't tested this and its
only theory.
If you test this and find it to work please
please email me at: enigmadeadsouls at yahoo dot
com (replace "at" with "@" and "dot" with "." I
do that so the spam bots do not pick up my email
address).
Send me pictures (keep them small) of your
modded ICST 9250-10 PLL-IC and give me your
website info if you wish for me to post it at
the bottom of this page.
Here is an Image of the ICST 9250-10 Pin-out.
Here is a
picture of the supported clock speeds.
As you can see
FS0 is what makes the difference in A or B.
However It was designed mostly for use for
either a 66MHz cpu or 100MHz cpu.. which is why
it doesn't have the correct 133MHz PCI/AGP
dividers. However if you're doing this with a
66MHz FSB CPU hitting 100MHz is good in
itself...however expect to need to up the cpu
voltage and use much better cooling such as a
copper heatsink with high output fan... maybe
even a peltier or some sort of "major" cooling
might be needed. However the stock cooling that
came with your machine chances are IS NOT
enough.
Here is a picture of where it tells what FS0
needs to be set to for either 66MHz CPUs or
100MHz CPUs.
Here is a
picture of the Mod. See what I've done is a
jumpering setup. See what you do is disconnect
FS0 (Pin 28) from the motherboard.. then to a
wire that which will connect to the center pin
in a jumper block. However you will need to use
a 10K resistor somewhere in between FS0 and the
center pin of the jumper block as shown in the
picture. Then you will connect one of the side
pins in the block to VDD4 (Pin 27). Then the
last pin to GND 4 (Pin 24).
To set FS0 to
1(100MHz) Jumper the center pin with the VDD4
pin.
To set FS0 to 0(66MHz) Jumper the center pin
with the GND4 pin.
Written at: 23:06 PM EST - Revision 0.2 - Fixed
typos where 9250-10 was said as 9520-10.
01:35 AM EST - Revision 0.1
04:40 AM EST - Revision 0
Written on: Tuesday, January 07, 2003 - Revision
0.2 - Fixed typos where 9250-10 was said as
9520-10.
Monday, December 09, 2002 - Revision 0.1
Saturday, December 07, 2002 - Revision 0
Written by: Enigma Deadsouls
Website: http://www.geocities.com/enigmadeadsouls
Names/Info from people who have emailed me their
test results:
None at this time.
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