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Service Hints & Tips |
Document ID: SSCT-3JMDY7 |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
IBM PC - Processor upgrade jumpers
Applicable to: World-Wide
Service Information:
The "Installing Options" manual describes processor upgrades for PC 300 systems but does not cover a couple of situations that may arise.
Intel has recently released 100MHz i486 DX4 and 25/63MHz Pentium Overdrive upgrades. These have onboard 5v to 3.3v regulators so may be installed in any SX, DX or DX2 model of the PC-300. If a DX4 Overdrive is fitted, remove jumpers JP10 1-2 and 3-4 .This ensures that the DX4 runs at 3x the planar speed.
The base planar speed is set by jumper J37 (ON=25MHz OFF=33 MHz). Some examples:
1. When upgrading from an SX/33 to a DX2/50 or Pentium Overdrive 25/63, J37 must be ON.
2. When upgrading from a DX2/50 to a DX2/66, DX4/100 or Pentium Overdrive 33/83, J37 must be OFF
Note: If a DX4 Overdrive is installed, the Setup utility may report the processor type as "unknown" and the speed as 0MHz. However QCONFIG (from DOS) will measure the actual processor speed.
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Search Keywords |
Intel | |
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Hint Category |
Processors | |
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Date Created |
06-09-95 | |
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Last Updated |
22-01-99 | |
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Revision Date |
13-04-99 | |
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Brand |
IBM PC | |
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Product Family |
PC 330, PC 350 | |
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Machine Type |
6571, 6573, 6575, 6581, 6583, 6585 | |
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Model |
Various | |
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TypeModel |
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