Intel i486 SX25

A KU80486SX-25 (in QFP package) fitted on an UMC 4SLUD motherboard from 1992. Typically these motherboards came with a soldered QFP CPU and an additional unpopulated socket. To upgrade these system an Overdrive processor could be fitted while keeping the SX25 soldered on-board. The Overdrive has an extra pin that disables the on-board CPU. I have DX2 ODP 50 Overdrive processor that could boost the system from SX25 to a DX2/50.

Specifications

Core / Codename

80486

Clockfrequency

25MHz

Front Side Bus

25MHz

Multiplier

1x

vCore

5V

L1 cache

8KB

L2 cache

None

sSpec

SX673

Chip date

9238

Stepping

?

Socket

PQFP196

Transistor count

0.9M

Condition

CPU only

Engineering sample?

No

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