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installed system board
processor(s) type 1 type 2
j10 j11 j17 j18
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80468SX only r r r r
80486SX and 80487SX r r r r
80486SX and overdrive r r r r
80486SX and DX f f f f
80486SX and DX2 f f f f
80486DX only f x f x
overdrive only r r r r
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r=rear two PINs (labeled od and closest to I/O connectors)
f=front two PINs
x=front or rear two PINs
Microprocessors can be identified by the following characteristics:
80486SX - soldered to system board; no heat sink.
80487SX - intel 80487 printed on heat sink
80486DX* - heat sink without identification
80486DX2* - heat sink without identification
IBM overdrive - "IBM FRU P/N 92F2582" printed on heat sink
Intel® overdrive - "Intel® overdrive" printed on heat sink
*use the system configuration utility to differentiate the dx and
DX2 processors.
Please see the LEGAL - Trademark notice.
Feel free - send a 
for any BUG on this page found - Thank you.