when installing options, you might find it easier to work with the computer lying on its side.
the following notes describe information that you must consider when installing a second microprocessor in your computer.
1 the speed of microprocessors 1 and 2 must match.
2 the microprocessor option kit comes with a microprocessor board, a microprocessor socket, the microprocessor, a fan sink, and a microprocessor air baffle. the necessary screws and the microprocessor socket are preinstalled on the microprocessor board.
3 each microprocessor contains a memory controller for the memory modules that are associated with it.
4 you must install at least one pair of matched dimms on the microprocessor board with the microprocessor. the dimms in each pair must be the same size, speed, type, and technology as each other but do not have to match other pairs. see “installing memory modules” on page 53 for information about the installation order and the type of dimms that are supported.
5 with more than one microprocessor, the computer can operate as a symmetric multiprocessing (smp) computer. with smp, certain operating systems and application programs can distribute the processing load among the microprocessors. this enhances performance for database and other applications.
6 to use smp, obtain an smp-capable operating system. for a list of supported operating systems, go to http://www.ibm.com/pc/us/compat/.
7 read the documentation that comes with the microprocessor to determine whether you need to update the computer basic input/output system (bios) code. the most current level of bios code for the computer is available from http://www.ibm.com/pc/support/.
8 for a list of supported microprocessor options for your computer, go to http://www.ibm.com/pc/; then, select your country and navigate to the list of options for your computer
before you begin, obtain the following items:
1. a phillips-head screwdriver
2. a flat-blade screwdriver or a nut driver
complete the following steps to install a second microprocessor.
for clarity, the illustrations in this procedure show only the system board. you will not remove the system board from the computer to perform this procedure.
1. read the safety information beginning on page vii, and the guidelines in “handling static-sensitive devices” on page 33.
2. turn off the computer and all attached devices (see “turning off the computer” on page 19).
3. disconnect all external cables and power cords; then, remove the side cover (see “removing the side cover” on page 37.)
4. remove the support bracket (see “removing and installing the support bracket” on page 38).
5. remove the rear adapter-retention bracket.
6. touch the static-protective package containing the microprocessor board to any unpainted metal surface on the computer. then, remove the microprocessor board from the package.
7. remove the six indicated screws from the system board.
8. position the alignment holes in the microprocessor board over the two plastic alignment pins on the system board; then, lower the microprocessor board onto the alignment pins.
a. when lowering the microprocessor board onto the two plastic alignment pins, it might help to hold it by one of the dimm slot tabs and one of the retention spring clips.
b. the screws on the microprocessor board are spring-loaded. when the microprocessor board is correctly in place, the screws will stick straight down and align with the six screw holes on the system board.
c. make sure that the connectors on the underside of the microprocessor board line up with the second-microprocessor connectors on the system board.
9. tighten the four screws on the fan-sink socket; then, tighten the two screws on the corners of the microprocessor board to secure the microprocessor board to the system board.
when you tighten the screw on the microprocessor board that is closest to the rear fan in computer, you might have to push the rear fan slightly to the side.
10. press down on the barcode label and the indicated corner to make sure that the microprocessor board is firmly seated in the connectors on the system board.
11. remove the protective cover, tape, or label from the surface of the microprocessor socket, if any is present.
12. lift the microprocessor-release lever to the fully open position (90°).
you must make sure that the locking lever on the microprocessor socket is in the fully open position before you insert the microprocessor in the socket. failure to do so might result in permanent damage to the microprocessor, microprocessor socket, and system board.
13. install the new microprocessor:
a. touch the static-protective package containing the new microprocessor to any unpainted metal surface on the computer; then, remove the microprocessor from the package.
b. position the microprocessor over the microprocessor socket as shown in the following illustration. carefully press the microprocessor into the socket.
to avoid bending the pins on the microprocessor, do not use excessive force when pressing it into the socket.
14. close the microprocessor-release lever to secure the microprocessor.
1 do not disturb or contaminate the grey thermal material on the bottom of the new fan sink. doing so damages its heat-conducting capability and exposes the new microprocessor to overheating.
2 if you need to remove the fan sink after installing it, call for service.
15. install the fan sink.
a. make sure that the two retention spring clips on the microprocessor retention bracket (on the microprocessor board) are open and rotated to either side as shown in the above illustration.
b. remove the fan sink from its package and remove the cover from the bottom of the fan sink. make sure that the thermal material is still on the bottom of the fan sink.
c. remove the release liner and orient the fan sink above the microprocessor.
d. make sure that you install the fan sink toward the rear of the computer so that the front of the fan sink and the fan-sink screws do not come in contact with any electrical components on the microprocessor board.
e. connect the fan-sink cable to the microprocessor fan connector on the microprocessor board; then, press the fan sink into place (see the illustration in “optional microprocessor board connectors” on page 36 for the location of the connector).
f. raise the retention spring clips into position on each side of the fan sink. start both screws into the fan-sink socket; then, tighten both screws. do not overtighten the screws.
16. install at least one pair of supported dimms on the microprocessor board. see “installing memory modules” on page 53 for information about the installation order and the type of supported dimms.
17. install the microprocessor air baffle.
a. orient the air baffle as shown and align it with the side of the power supply.
b. insert the small end of the baffle into the computer toward the front of the computer.
c. lower the larger end of the baffle until the side flange rests on the power supply.
d. slide the baffle toward the rear of the computer until it stops and the rear flange (locking lip) is inside the computer chassis; then, press down on the large end of the baffle until it clicks into place.
18. if you have other options to install or remove, do so now.
19. replace the support bracket (see “removing and installing the support bracket” on page 38).
20. replace the side cover (see “replacing the side cover” on page 63).
21. reconnect the external cables and power cords. turn on the attached devices, and turn on the computer.