Knowledge Base Article
Subject: MP975 CPU configurations and upgrades
Model: MP975 BIOS Ver: n/a
OS: n/a Download File(s): n/a
Created: 03/24/00 Modified: 10/12/2020

 Type
Intel Pentium P54C 75~200Mhz is supported by all versions.

MMX is supported by systems with a 2.8v setting on the mainboard.  You can check this by removing the hard drive (see above) and looking at the mainboard.  On the mainboard under the hard drive, there are switch settings printed.  If there is setting printed for 2.8V, you can support MMX.  If there is no 2.8v setting, you cannot use MMX (2.9v is NOT good enough)

233Mhz is supported on systems which support MMX and also have "7" as the second digit of the serial number.

Location
The microprocessor is located on the under side rear of the computer, under the door with the fan vents.

Installation

  1. Turn the computer off and remove all power sources
  2. Remove the hard drive (see above)
  3. Remove the 2 screws on the door with the fan vents
  4. Slide the door towards the center of the computer and remove lift off
  5. Under the door you will see a heatsink/fan assembly.
  6. Next to the fan there is a duct, in the center of this duct is a piece of tape which covers a screw. Peel back the tape and remove this screw.
  7. Just to the other side of the fan there is a second screw. Remove this and remove the heatsink/fan
  8. You will see the Intel Chip. It is in a white socket. You should see the 2 tabs labeled Lock and open on either side of the chip.  Look at the Lock side, it may be covered by a black plastic clip.  If this clip is there, remove it.
  9. Insert the tip of a flat screwdriver into the hole on the open side and move the handle of the screwdriver towards the chip.  This will move the socket and chip about 1mm.
  10. Remove the chip from the socket
  11. Set the switches to match your new CPU chip.  The switch settings are printed on the mainboard, under the hard drive.  Note that the CPU switches are the larger switch only.  Do NOT move any of the switches on the smaller switch as these set the display type and changing them will damage your display
  12. Insert the new chip, it should just drop into place.   Note the pins are not symmetrical, so the chip will only fit in one direction.
  13. Place a flat screwdriver into the lock side of the socket and move the handle toward the chip.
  14. You must be sure the socket moves all the way so that there is no gap on the open side (see diagram).  This often takes a bit more force than most people think they should apply.  If the socket does not lock all the way either the system will not boot or the socket will loosen causing the system not to boot at a later date.
  15. Re-assemble the computer.

Switch Settings
Next to the CPU there are 2 switch blocks.  There is one 4 switch block labeled SW2 and one 8 switch block labeled SW1. The 4 switch block (SW2) is used to configure the LCD type, DO NOT change any of the switches on this block.  Changing these switches can damage your LCD. The 8 switch block (SW1) is used to configure your CPU.  The settings for SW1 are as follows:

Note these settings cover most versions, you should verify with the settings printed on your mainboard under the hard drive assembly.  If the settings differ, use the settings printed directly on the mainboard.

SW1:1 - This is labeled for AMD/Intel, however AMD support was abandoned prior to product release, so only Intel CPU's can be used.  You should leave this switch off.

2.5V 2.8V 3.1V 3.3V
SW1:2 OFF ON OFF OFF
SW1:3 OFF OFF ON OFF
SW1:4 OFF OFF OFF ON

 

75 90 100/233 120 133 150 166 200
SW1:5 OFF OFF OFF OFF OFF ON ON ON
SW1:6 OFF OFF OFF ON ON ON ON OFF
SW1:7 OFF ON ON ON ON ON ON ON
SW1:8 OFF OFF ON OFF ON OFF ON ON

 

KEYWORDS: UPGRADE UPGRADES CPU PENTIUM