Overdrive Processor Installation; Pga/Overdrive Socket Lever - NEC POWERMATE 4100M Service Manual

3-10 Options

OverDrive Processor Installation

The zero-insertion force (ZIF) pin-grid arrays (PGA)/OverDrive socket accepts processors.
Once the currently installed processor is removed from the socket, the next generation
OverDrive Processor can be installed.
The Intel486DX2-66, and DX4-100 CPUs have a math coprocessor built into the micro-
processor and can be upgraded by replacing the processor with the next generation Over-
Drive processor. The PowerMate 433D (Intel486SX-33) accepts either an Intel487SX math
coprocessor or an OverDrive processor in the PGA/OverDrive socket.
The procedure is the same for installing a math coprocessor or an OverDrive processor into
the PGA/OverDrive socket for both the desktop and minitower systems.
Install a OverDrive processor into the system board as follows.
1. Remove the top cover and any expansion boards covering the PGA/OverDrive
socket as previously described.
2. Locate the PGA/OverDrive socket on the system board (see Figure Section 3-16).
Lift the PGA/OverDrive socket lever (shown in Figure Section 3-18) all the way
3.
back and remove the processor currently installed.
Figure Section 3-18 PGA/OverDrive Socket Lever
CAUTION: Heatsinks are required for micro-
processors, math coprocessors, and OverDrive
processors installed in the systems.
Heatsinks are available through NEC.
Lever