Building an Intel Pentium 4 PC

When constructing a PC based on early P4 technology, esp. if you are using the Intel D850GBAL Motherboard, there are several changes you must take into account that differ from the construction of a P3-based PC. Primarily, you must be using an ATX12V P4 certified power supply that has the additional power connectors and enhanced current ratings required by the P4 motherboard. The case you purchase must also provide four (4) additional standoff mount threaded screw holes to accommodate the new P4 Heat Sink Assembly. Here's a pictorial of highlights involving the assembly of an Intel D850GBAL P4 PC motherboard. Click on each image Icon to see an enlarged version of the picture. When finished viewing the picture, click on your browser's BACK button to return to this page. (Please Note: When implementing newer Intel P4-compatible motherboards (D850MV, etc.), a new heat sink mounting assembly has been introduced that eliminates the requirement for the additional 4 standoff mount screw holes. However, the power supply must still be P4 compatible.)



1. The BOXED version of the Pentium 4 CPU comes with the CPU chip mounted on its own 423-pin circuit board, a Heatsink Assembly (including 3-wire controllable fan), a syringe containing heatsink compound, the warranty and installation instructions, and an "Intel Inside" sticker. The heatsink compound is injected onto the top of the CPU, and is designed to enhance the transfer heat to the heatsink assembly.



2. The motherboard requirements are different for a P4 as opposed to a P3 CPU. The Intel D850GB motherboard has four additional mounts for the CPU heatsink assembly and two additional power supply connections. The heatsink mounts are supplied with the Intel D850GB Boxed Motherboard.



3. This picture shows the four extra  heatsink standoffs required of the case assembly to install the Pentium 4 heatsink mounts for an Intel D850GB Motherboard.


4. This photo shows the above image with the new items highlighted. They include the new heatsink assembly mounts, the ATX12V power connector, and the auxiliary power connector.


5. Memory used with Intel D850GB motherboards,  designed for the P4 CPU, must be installed in pairs that are matched in size, speed, and density. There are 4 RIMM sockets into which you can install from 128MB (minimum) to 2GB (maximum) RDRAM.

For example, to obtain 256MB of RDRAM, you must install a pair of 128MB RDRAM memory RIMM modules into each of the first two slots. The remaining two slots, given that they are not populated, must have a pair of "Continuity RIMMs (C-RIMMs)" installed to complete the memory connections. If any of the memory slots are not populated, POST will not complete. When you purchase the Intel D850GB boxed motherboard, it includes a pair of C-RIMMs.



6. This picture shows the installation of the two Heat Sink Assembly mounts on the Intel D850GB Motherboard. There is one mount on each side of the CPU socket to facilitate mounting the Heat Sink Assembly included with the boxed Intel P4 CPU. The Case you purchase for your P4 must include threaded holes for the Heat Sink Assembly Mount standoffs. Older cases, designed for P3 CPU motherboards with its ATX form factor, do NOT include these additional 4 holes.



7. Another picture of the CPU socket surrounded by the new P4 Heat Sink Assembly Mounts.


8. This photo shows the Intel P4 CPU and its circuit board mounted in the Intel D850GB 423-pin CPU socket. The heat sink compound, included with the boxed Intel P4 CPU,  is deposited on top of the CPU chip itself. Note the CPU circuit board alignment mark (a small triangle) located on the upper left corner of the CPU circuit board.


9. This is a photo of the installed CPU/Heatsink Assembly.


10. The Intel D850GB motherboard, using the 850 Chipset, uses RIMM modules of RDRAM (The RIMM module contains the RAMBUS RAM). This memory is available in either a PC600 or PC800 module format. We use the PC800 RDRAM  to accommodate the 400MHz System Bus with no problems.



11. This is a photo of the backside of the RIMM module. Pay attention to the connector key slots as you install the memory into the motherboard RIMM slots.



12. This photo shows the installed RDRAM RIMM modules, and also shows the Continuity RIMM modules (C-RIMM) installed in the 3rd and 4th RIMM memory slots.


13. Here's another picture of the RIMM and C-RIMM  installations.


14. All the parts are installed. The motherboard is now ready to mount on the case chassis.


Note: Use this information at your own risk!
HLS Systems, Inc assumes NO responsibility resulting from the implementation of knowledge,
or the lack of, gained from this page.

Last Updated on 10 Oct 2009 16:47 EST