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Old June 6th 04, 01:33 AM
Michael Brown
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matiii wrote:
SHHEEESHH!!

1. I set mobo multiplier jumpers to auto, FSB jumper (CLK_SW) to off,
meaning 100MHz "fix 200MHz CPU" as the manual says. It also says "You
must set CLK_SW to 100MHz when you used FSB 200MHz CPU". So it is
done.


I think this just makes the FSB at 100MHz, and unchangable. This is not what
you want, so try setting CLK_SW to on.

[...]
Michael Brown wrote:

With the CPGA chips, the copper traces on the top are fakes. You can
remove them without damaging the chip at all (yes, this was verified
on the Duron in a rather unfortunate accident ...). The real traces
are actually under the ceramic, so you need a diamond drill to cut
through them.


I also considered changing multi by opening/closing the L6 bridges,
but that really put me off. Where do you got this info from?


http://www.beachlink.com/candjac/duronocpg2.htm
Except this page is no longer in existance ... archive.org to the rescue!
http://web.archive.org/web/200302020...ndjac/duronocp
g2.htm

The "top traces are fake" was verified by messing around with the VID
bridges on a CPGA duron and not having anything change despite completely
removing one bridge from the chip. Well, they are sorta fake ... you can
rejoin a bridge using the ones on the top, but not break one.

The diamond-tipped drill info from various sources, the most interesting
being
http://www.bunkermentality.net/keychain.html
(down the bottom)


Oh, and the last thing, Gene Puhl wrote:

The Duron is "double pumped", an FSB of 100mhz is really 200mhz to
the system.


So, what about DDRs? CPU-Z (or WCPUid) reports that *FSB* is 200 and
*system bus*, or *system clock* (WCPUid) is 100 - DDR runs at 200,
according to CPU-Z. Now, is this physical frequency they run at, and
then data rate is doubled, cause they are DDRs, or is it calculated
double-times-FSB, meaning they actually run at 100MHz?


Welcome the the world of marketing-induced FSB confusion. I'm sure Wes will
do a nice rant on this but essentially half the bus (the control part) is
running at 100MHz, and the other half (the data part) is running at 200MHz
(which is why it's called DDR). The actual clock signal fed to the CPU is
the 100MHz one. Which speed is reported varies with whichever tool you are
using. Some report the doubled speed, some report the base speed. The
"marketing" speeds are the doubled ones, whereas the BIOS ones are are quite
inconsistant. If you have 1MHz adjustments, these will be the base speeds,
and if you have ones that allow you to select 400,333,266,200 then they're
the doubled speeds.

The base speed is what is multiplied by the CPU (since this is what it is
fed), ie: with a 200MHz marketing bus, you have a 7x multiplier to get
700MHz.

[...]

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Michael Brown
www.emboss.co.nz : OOS/RSI software and more
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