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2.441 bytes |
Service Hints & Tips |
Document ID: GSMH-39DCKH |
IBM ValuePoint - DX4 Overdrive chip
Applicable to: World-Wide
Symptom:
ValuePoint Performance series system upgraded with IntelDX4 Overdrive chip will not run at 50/100 MHz.
Problem Isolation Aids:
None.
Fix:
The ValuePoint Performance system board can be jumpered to run at 25, 33, 40 or 50 MHz. The Intel DX4 processor (the standard 3.3 volt chip) can run at 2X, 2.5X or 3X the planar speed. Thus for optimum performance the VP-p 100DX4/p systems shipped by IBM run the planar at 50MHz and double-clock the CPU at 100MHz.
However, the IntelDX4 Overdrive (retail upgrade) chip can only triple-clock. If an SX, DX or DX2 system is upgraded using the DX4 Overdrive the planar must be jumpered to 33MHz (ie 33/100 MHz operation). You cannot run at 50/100MHz with the Overdrive DX4. Do not attempt 40/120MHz either - the system may appear to work OK but the CPU will overheat and/or produce incorrect results.
Note:
F1 Setup may not report the correct processor type or speed if a DX4 Overdrive is fitted, however the DOS command QCONFIG will.
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Search Keywords |
Intel | |
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Hint Category |
Processors | |
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Date Created |
07-09-95 | |
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Last Updated |
22-01-99 | |
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Revision Date |
29-04-99 | |
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Brand |
IBM PC | |
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Product Family |
ValuePoint | |
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Machine Type |
6472, 6482, 6484, 6492, 6494 | |
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Model |
Various | |
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Retain Tip (if applicable) |
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