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From: FlamingTaco on 18 Feb 2006 06:31
When I first built my current main PC, I intended on NOT being
obsolete in two years. All the best components. I must say, this
machine has done much better than anticipated. Seven years, averaging
14 hours of use. Three keyboards, two track balls, two monitors, two
chairs, two tables and two houses. Amazing.

As much as I could glorify Asus products, the time has come to upgrade
my beast. I thought I was going to build a new PC, until I came across
Slot-T. Oh joy of joys! I get to keep my baby!

I had wanted to use a Pentium 1.4, but was talked out of it by the
Slot-T rep. The rep said I might or might not get it to work. Well, I
want it to work, so, I got a 1.3 Celeron (because it's 3/5 to cost of
a 1.4).

Then, I came across the pages of P2B's site that details modifying the
P2B-DS board with an ICS 9250CF-08.

Ok, I've got a 9150AF-08...

I did some more searching, but apparently this clockgen is so far out
of date, even google can't reveal anything usefull about it. And it's
not in Allied's Catalog.

Then I read that adding the missing jumper header and resistor only
gives you a paltry 107Mhz. Hey, there's already a setting for
that...

But then, on another of P2B's pages, where he tests various cpu's,
it's mentioned that a P2B-S board is run at 150Mhz, but no detail is
provided on how this was accomplished.

So.................................

Mr P2B... how did you get the P2B-S to run at 150Mhz FSB? Solder in a
different clock gen? Find a magic pin setting? Place a magnet on the
FSB?

Please enlighten me as to the way to get the FSB to become more
compatible with the chip I'd really like to use, a P3-S. I'll take
the Celeron, over my SL3CC, but there's a reason the machine sports a
Katmai and not a Mendocino.

I thank you in advance!

David -AKA- Senior Flamingtaco

From: Daniel Mandic on 18 Feb 2006 08:47
FlamingTaco wrote:

> Then I read that adding the missing jumper header and resistor only
> gives you a paltry 107Mhz. Hey, there's already a setting for
> that...


You can underclock the Tualatin. (I think I have tried 75MHz [66MHz FSB
is not working], me it is working at 103MHz FSB (3MHZ OC - 82443),
gives fantastic 1083MHz hypercached i686)



Best Regards,

Daniel Mandic
From: Roland Scheidegger on 18 Feb 2006 15:49
FlamingTaco wrote:
> I had wanted to use a Pentium 1.4, but was talked out of it by the
> Slot-T rep. The rep said I might or might not get it to work. Well, I
> want it to work, so, I got a 1.3 Celeron (because it's 3/5 to cost
> of a 1.4).
A Celeron 1.4 works just as well as a 1.3, if you have the latest 1014
beta3 bios (otherwise the 1.4 will not boot at all IIRC, not sure about
the 1.3, older bios have a bug with high multipliers). In any case
though it's not really a big win, those chips are usually highly
bandwidth-starved due to the slow fsb (so, a celeron 1.0a overclocked to
1.33Ghz will be quite a bit faster than a celeron 1.4 unless your
workload fits into cache like with synthetic cpu benchmarks), that 8%
clock speed advantage doesn't really translate into that much of
real-world performance advantage. Tualatin P3 as opposed to Tualatin
Celeron doesn't really provide any benefits, other than the (quite big)
advantage due to higher fsb, which you can easily get with the
lower-clocked celerons by overclocking (1.0A and 1.1 sould overclock to
133Mhz fsb). P3-S has two times the cache, which is nice but may be
overpriced for the modest performance advantage (for single core systems
that is). Since you can't get 133Mhz FSB this is all only interesting in
theory only though anyway...

> I did some more searching, but apparently this clockgen is so far out
> of date, even google can't reveal anything usefull about it. And
> it's not in Allied's Catalog.
I think I have seen a datasheet a long time ago but couldn't find it
neither recently.

> But then, on another of P2B's pages, where he tests various cpu's,
> it's mentioned that a P2B-S board is run at 150Mhz, but no detail is
> provided on how this was accomplished.
>
> So.................................
>
> Mr P2B... how did you get the P2B-S to run at 150Mhz FSB? Solder in a
> different clock gen? Find a magic pin setting? Place a magnet on the
> FSB?
Well, new revistion P2B-S/LS/L boards (those are all the same pcb) use
newer clock chips, as well as vrm which go down to 1.3V (which you
really want for using slot-t + tualatin).
Board rev. 1.04 pcba D02 and newer are guaranteed to have new vrm (there
are apparently even 1.03 boards out with new vrm), and for the new clock
chip you need even a newer rev. (unless you really want to try your
soldering skills...)
(shameless plug
http://homepage.hispeed.ch/rscheidegger/p2b_procupgrade_faq.html)

Roland
From: P2B on 19 Feb 2006 23:08


FlamingTaco wrote:

> When I first built my current main PC, I intended on NOT being
> obsolete in two years. All the best components. I must say, this
> machine has done much better than anticipated. Seven years, averaging
> 14 hours of use. Three keyboards, two track balls, two monitors, two
> chairs, two tables and two houses. Amazing.
>
> As much as I could glorify Asus products, the time has come to upgrade
> my beast. I thought I was going to build a new PC, until I came across
> Slot-T. Oh joy of joys! I get to keep my baby!
>
> I had wanted to use a Pentium 1.4, but was talked out of it by the
> Slot-T rep. The rep said I might or might not get it to work. Well, I
> want it to work, so, I got a 1.3 Celeron (because it's 3/5 to cost of
> a 1.4).
>
> Then, I came across the pages of P2B's site that details modifying the
> P2B-DS board with an ICS 9250CF-08.
>
> Ok, I've got a 9150AF-08...
>
> I did some more searching, but apparently this clockgen is so far out
> of date, even google can't reveal anything usefull about it. And it's
> not in Allied's Catalog.
>
> Then I read that adding the missing jumper header and resistor only
> gives you a paltry 107Mhz. Hey, there's already a setting for
> that...
>
> But then, on another of P2B's pages, where he tests various cpu's,
> it's mentioned that a P2B-S board is run at 150Mhz, but no detail is
> provided on how this was accomplished.
>
> So.................................
>
> Mr P2B... how did you get the P2B-S to run at 150Mhz FSB? Solder in a
> different clock gen? Find a magic pin setting? Place a magnet on the
> FSB?

I started by buying a lot of new-old-stock P2B-S revision 1.04
motherboards, some Tualatin Celeron 1A processors, Corsair PC150 SDRAM,
and Slot-T adapters.

The P2B-S 1.04 has a Tualatin-capable voltage regulator, an ICS9250-08
clock chip, and vacant spots on the board for a 4th FSB jumper. After
soldering in the 4th jumper, the 150Mhz FSB setting is available.

My success rate at 150Mhz was 50%. The Celeron 1A processors all run
stable at 1500Mhz on default voltage, but only half the P2B-S 1.04
boards are completely stable at 150Mhz - the others can only manage 140Mhz.

I have successfully transplanted ICS9250-08 clock chips from dead
motherboards onto P2B-DS boards which originally had 9150s, but have
never tried it on a P2B-S - should be possible, but perhaps not worth
the trouble given the result may not be stable at 150Mhz.

P2B

> Please enlighten me as to the way to get the FSB to become more
> compatible with the chip I'd really like to use, a P3-S. I'll take
> the Celeron, over my SL3CC, but there's a reason the machine sports a
> Katmai and not a Mendocino.
>
> I thank you in advance!
>
> David -AKA- Senior Flamingtaco
>
From: FlamingTaco on 21 Feb 2006 10:34
I'd take 133 if I can get it. Anything to feed the CPU a little
better.

Do you have any boards for sale? Or chips? Would I need a VRM as well,
or does the slot-t card handle that?

Also, have you looked for better cooling options, or are the stock
HSF's up to the task? I'm considering fabricating a clip to attach
something like this:

http://www.frozencpu.com/images/products/detail_secondary_hires/ex-blc-212_3.jpg

or this:

http://www.scythe-usa.com/product/cpu/009/scktncu1000_detail.html

I also think this might fit without impinging upon the first RAM slot.
I'm going to measure shortly. Won't do much for overclocking, though.

http://www.pcabusers.com/reviews/zalman/p1.html

Thanks,
David

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