Intel Pentium Pro Stepping Revisions and
Upgrading to Dual or Quad Processors
Models affected FT2200 and FT4200
Intel has changed the Stepping of the Pentium Pro processor. The
original processor was an A1 step, Intel have now introduced the B1 step. Whilst this
causes no problems with single processor systems (FT1200) it will cause problems when
Upgrading an FT2200 to dual or FT4200 to dual/quad operation.
The consequence of installing mixed steppings of processors will be
either to hang the machine on boot or to cause unreliable operation.
It is recommended that only processors of the same stepping be installed
in multiprocessor systems. Identification of the stepping is by removing the heatsink on
an installed processor and examining the top line of text on the chip
The Step Code allows the processor to be identified as follows;
| PT12394630 |
SY032 |
200MHz |
256K Cache |
A1 Step |
| PT12439130 |
SL22T |
200MHz |
256K Cache |
B1 Step |
| PT12439130 |
SL22V |
200MHz |
256K Cache |
B1 Step |
| PT12385130 |
SY048 |
200MHz |
512K Cache |
A1 Step |
| PT12439230 |
SL22Y |
200MHz |
512K Cache |
B1 Step |
| PT12439230 |
SL22Z |
200MHz |
512K Cache |
B1 Step |
Apricot are only shipping B1 step processors, if you have a A1 processor
and wish to upgrade to dual or quad processors it is recommended that the A1 step
processor be replaced by a B1 step processor.
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