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Technology Stocks : Intel Corporation (INTC)
INTC 40.07-1.2%9:32 AM EST
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To: Elmer who wrote (120548)12/4/2000 8:07:04 PM
From: Petz  Read Replies (1) of 186894
 
On-topic (!) To increase yields of 1GHz PIII CPUs, Intel boosted the Vcc to the peculiar level of 1.76 volts for selected 1GHz PIII's designated as "1B" GHz Pentium III's. Yet, the Vcc "ID" pins of the CPU are set at 1.7 volts, which means the CPU will not work in normal motherboards unless the builder "overrides" the Vcc sense pins and manually sets the voltage to 1.76.

The voltage tolerance on this Gigamine is also tighter than any other P3's. An extra 0.04 volts on the plus side, and kiss your investment goodby. THe power dissipation is 3w higher than the "regular" Gigamines, but the max junction temperature can't exceed 70C, like the "regular" Gigamine.

The fact that the Vid pins are set to 1.7 rather than 1.75 indicates that Intel is retesting selected 933 MHz chips, boosting the voltage, and checking if it will operate at 1 GHz. If so, they remark the chip, but since the Vid fuses have already been blown, the buyer of the chip has to override the now-incorrect voltage.

I assume Intel is only selling these to the OEM market, otherwise there will be lots of returns to SD shops who blindly assume that the Voltage Sense pins are programmed properly.

REFERENCE:
The Intel November datasheet in which I discoverd the "B" part is linked to at
developer.intel.com
The direct link to the datasheet is ftp://download.intel.com/design/PentiumIII/datashts/24526407.pdf
The datasheet refers to an S-spec "SL4WM." This S-spec number isn't documented in the PIII specification update yet.

Petz
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