Your computer is designed for dual-processor operations. The heat sinks (CPU_0 and CPU_1) are keyed to fit their specific connector.
For single-processor operations, the processor must be installed in socket CPU_0. The VRM for the single processor is already installed and cannot be removed. Processor socket 1 and VRM connector 1 must be empty. To locate these components, see the system board components illustration (for the Dell Precision 450 computer, see "System Board Components" or for the Dell Precision 650 computer, see "System Board Components") or the system board label inside your computer.
For dual-processor operations, both processor sockets and the VRM connector must be populated. To locate the VRM connector, see the system board components illustration (for the Dell Precision 450 computer, see "System Board Components" or for the Dell Precision 650 computer, see "System Board Components")or the system board label inside your computer.
For dual-processor operations, the two processors and the VRMs must be identical. If the processors do not match, you receive a system message. If the processors voltage don't match or the VRM is not properly installed, the diagnostic lights indicate an error..
If you are upgrading your microprocessor, keep your original microprocessor heat sink and securing clips for future troubleshooting.
CAUTION: The processor can get very hot during normal operation. Ensure that the processor has had sufficient time to cool before you touch it.
CAUTION: Before you perform this procedure, follow the safety instructions in the System Information Guide.
Shut down the computer through the Start menu.
Ensure that your computer and attached devices are turned off. If your computer and
attached devices did not automatically turn off when you shut down your computer,
turn them off now.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then
unplug it from the network wall jack.
Disconnect any telephone or telecommunication lines from the computer.
Disconnect your computer and all attached devices from electrical outlets, and then
press the power button to ground the system board.
If you have installed a padlock through the padlock ring on the back panel, remove the
padlock.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an
unpainted metal surface, such as the metal at the back of the computer. While you work,
periodically touch an unpainted metal surface to dissipate any static electricity that could harm
internal components.
NOTICE: You must position the microprocessor correctly in the socket to avoid permanent
damage to the microprocessor and the computer.
If the release lever is not extended to the release position, move it to that position.
Align pin-1 (the imprinted corner) of the microprocessor and pin-1 of the socket.
NOTICE: Microprocessor pins are delicate. To avoid damage, ensure that the microprocessor
aligns properly with the socket, and do not use excessive force when you install the processor.
Carefully set the microprocessor in the socket and press it down lightly to seat it.
Rotate the release lever back toward the system board until it snaps into place,
securing the microprocessor.
Remove the thermal grease protective cover and place the heat sink in the base.
Place one end of the heat sink under the tab on the retention module on the side
opposite the lever. Lower the heat sink onto the microprocessor so that the heat sink
fits securely under the tab on the other end of the retention module.
Replace the retention module clips.
If you installed a microprocessor replacement kit from Dell, return the original heat
sink assembly and microprocessor to Dell in the same package in which your
replacement kit was sent.
If you are installing a second microprocessor, install the VRM.
NOTE: It is recommended that only a technically knowledgeable person perform this procedure.
CAUTION: The processor can get very hot during normal operation. Ensure that the processor has had sufficient time to cool before you touch it.
CAUTION: Before you perform this procedure, follow the safety instructions in the System Information Guide.
Shut down the computer through the Start menu.
Ensure that your computer and attached devices are turned off. If your computer and
attached devices did not automatically turn off when you shut down your computer,
turn them off now.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then
unplug it from the network wall jack.
Disconnect any telephone or telecommunication lines from the computer.
Disconnect your computer and all attached devices from electrical outlets, and then
press the power button to ground the system board.
If you have installed a padlock through the padlock ring on the back panel, remove the
padlock.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an
unpainted metal surface, such as the metal at the back of the computer. While you work,
periodically touch an unpainted metal surface to dissipate any static electricity that could harm
internal components.
NOTICE: If you are installing a microprocessor upgrade kit from Dell, discard the original heat
sink. If you are not installing a microprocessor upgrade kit from Dell, reuse the original heat
sink when you install your new microprocessor.
Remove the microprocessor heat sink:
Remove the two retention module clips by pressing the tabs together and lifting
the retention module clips up.
Press the lever on the retention module until the heat sink is released.
Gently lift the heat sink from the microprocessor.
Pull the release lever straight up until the microprocessor is released.
NOTICE: Be careful not to bend any of the pins when you remove the microprocessor from the
socket. Bending the pins can permanently damage the microprocessor.
If you are replacing the microprocessor, leave the release lever extended in the release position so that the socket is ready for the new microprocessor and go to "Installing the Microprocessor."
If you are removing a second microprocessor and not installing another one, remove the VRM and then continue with step 9.
