P2B and Tualatin 1.4 GHz CPU

Christian Ansorge

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Apr 10, 2003, 2:59:44 PM4/10/03

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I put a Tualatin Celeron CPU 1.4 GHz to an Asus P2B Rev. 1.10 with
newest beta Bios and Slot-T adapter from Upgradeware. The onboard P2B
Voltage regulator IC is HIP6019BCB. That worked fine immediately even
with 112 MHz FSB. CPU speed is 1568 MHz and stable as a rock!

Then I tried to update another P2B Rev 1.12.
After flashing new Bios I installed the same adapter and CPU from the
first board. Now the CPU fan only started for one second and then
stopped. No post, no video.

This Rev 1.12 board had another voltage regulator IC Unisem UC3007CW.
From the datasheet I know it should make the needed 1.5 V. Any idea
why the new CPU is only running in the older Rev 1.10 but not on the
newer 1.12?

Christian

BTW: the 1.12 board runs still fine with a 1000 MHz Coppermine Celeron
and 1.75 Volt.

P2B

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Apr 10, 2003, 7:26:58 PM4/10/03

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Christian Ansorge wrote:
> I put a Tualatin Celeron CPU 1.4 GHz to an Asus P2B Rev. 1.10 with
> newest beta Bios and Slot-T adapter from Upgradeware. The onboard P2B
> Voltage regulator IC is HIP6019BCB. That worked fine immediately even
> with 112 MHz FSB. CPU speed is 1568 MHz and stable as a rock!
>
> Then I tried to update another P2B Rev 1.12.
> After flashing new Bios I installed the same adapter and CPU from the
> first board. Now the CPU fan only started for one second and then
> stopped. No post, no video.
>
> This Rev 1.12 board had another voltage regulator IC Unisem UC3007CW.
> From the datasheet I know it should make the needed 1.5 V. Any idea
> why the new CPU is only running in the older Rev 1.10 but not on the
> newer 1.12?

No idea - the Inisem part is actually a cross reference for the
HIP6019BCB and supplies the same range of voltages, yet your symptoms
are exactly what happens if the regulator shuts down because it cannot
supply the requested voltage.

Have you tried setting the Slot-T for 1.45 or 1.55v ?

blero

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Apr 10, 2003, 7:43:00 PM4/10/03

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Christian Ansorge wrote:

> Then I tried to update another P2B Rev 1.12.
> After flashing new Bios I installed the same adapter and CPU from the
> first board. Now the CPU fan only started for one second and then
> stopped. No post, no video.
>
> This Rev 1.12 board had another voltage regulator IC Unisem UC3007CW.
> From the datasheet I know it should make the needed 1.5 V. Any idea
> why the new CPU is only running in the older Rev 1.10 but not on the
> newer 1.12?

I don't know. I can only say my P2B Rev 1.10 with a UNISEM US3007CW (US,
not UC) runs fine with a Tualatin 1.3 Ghz (Asus S370-DL slotket
modified).

kmchow

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Apr 10, 2003, 7:44:51 PM4/10/03

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Have you tried upping the voltage by .1 to .2 and seeing if that will work?

"P2B" <p...@sympatico.ca> wrote in message
news:T4nla.8938$N94.7...@news20.bellglobal.com...

Paul

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Apr 11, 2003, 9:42:28 AM4/11/03

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In article <b74vi6$b0qma$1...@ID-64146.news.dfncis.de>, "blero"
<bl...@nonospam.com> wrote:

What are the chances the US3007 is overloaded ? Try reducing the FSB
and see if it runs. A lower FSB will reduce Fcore and reduce power
consumption. Also, do you have a recent BIOS in there ?

HTH,
Paul