Warning: Processors not specifically listed by type and rated speed may have requirements that are not supported by the motherboard's design. Use of unsupported processors may result in improper operation, damage to the motherboard or processor, or reduced product life.

The following table shows the processor steppings that have been qualified with the Intel PR440FX Motherboard:

Intel PR440FX Motherboards with BIOS versions 1.00.02.DI0 or earlier cannot be reliably operated with sB1 stepping Pentium Pro processors. The failure symptoms include a) no video accompanied by a blinking power LED, b) failure to recognize the second processor in a dual processor configuration, or c) random system crashes. If BIOS version 1.00.02.DI0 is installed, you may be able to upgrade to the latest BIOS version; this must be done with a single processor installed. If the system has two processors installed, remove the second processor before attempting the upgrade. If the BIOS upgrade procedure fails, or if BIOS version 1.00.01.DI0 is installed, replace the sB1 stepping processor with an sA1 stepping processor and then upgrade to the latest BIOS version. Once the BIOS upgrade is complete you may reinstall the sB1 stepping processor(s).

Type of second Pentium Pro processor that should be used on the Intel PR440FX Motherboard
The second Pentium Pro processor on the Intel PR440FX Motherboard must be the same speed and a second-level cache size as the first processor. The second processor must also be the same stepping as, or no more than one stepping higher or lower than the primary processor. In the following table, only the combinations of primary and secondary processors marked "YES" are qualified for use in dual processor Intel PR440FX Motherboards.

When the Intel VRM need to be used
Motherboards with two processors require a VRM. There are two types of VRMs: 5V and 12V. The Intel® PR440FX Motherboard supports 5V modules. Please refer to the Intel PR440FX Technical Product Specification and Motherboard Specification Update for details.

System Memory Combinations

The following table shows examples of possible memory combinations. Not all possible combinations are shown. The Intel® PR440FX Motherboard supports EDO DRAM DIMMs.

• DIMM Memory Combinations

  Bank 0 Bank 1 Bank 2 Bank 3 Total System Memory 16 MB Empty Empty Empty 16MB 16 MB 16 MB Empty Empty 32MB 32 MB 16 MB Empty Empty 48 MB 32 MB 32 MB Empty Empty 64 MB 64 MB 16 MB Empty Empty 80 MB 64 MB 32 MB Empty Empty 96 MB 64 MB 32 MB 16 MB Empty 112 MB 64 MB 64 MB Empty Empty 128 MB 128 MB 16 MB Empty Empty 144 MB 128 MB 32 MB Empty Empty 160 MB 128 MB 32 MB 16 MB Empty 176 MB 128 MB 64 MB Empty Empty 192 MB 128 MB 64 MB 16 MB Empty 208 MB 128 MB 64 MB 32 MB Empty 224 MB 128 MB 64 MB 32 MB 16 MB 240 MB 128 MB 128 MB Empty Empty 256 MB 128 MB 128 MB 16 MB Empty 272 MB 128 MB 128 MB 32 MB Empty 288 MB 128 MB 128 MB 32 MB 16 MB 304 MB 128 MB 128 MB 64 MB Empty 320 MB 128 MB 128 MB 64 MB 16 MB 336 MB 128 MB 128 MB 64 MB 32 MB 352 MB 128 MB 128 MB 128 MB Empty 384 MB 128 MB 128 MB 128 MB 16 MB 400 MB 128 MB 128 MB 128 MB 32 MB 416 MB 128 MB 128 MB 128 MB 64 MB 448 MB 128 MB 128 MB 128 MB 128 MB 512 MB

  Vendor* Test Vendor Part Number 1M x 72 (8MB), Buffered ECC - 60ns None at this time.     2M x 72 (16MB), Buffered ECC - 60ns Micron Technology FULL MT9LD272G-60X 2M x 72 (16MB), Buffered ECC - 50ns None at this time.     4M x 72 (32MB), Buffered ECC - 60ns Micron Technology FULL MT18LD472G-60X IBM FULL IBM11M4735CBD-60 Samsung FULL KMM372F400BK-6U 4M x 72 (32MB), Buffered ECC - 50ns Micron Technology FULL MT18LD472G-5 8M x 72 (64MB), Buffered ECC - 50ns None at this time.     8M x 72 (64MB), Buffered ECC - 60ns Advantage Memory Corp. FULL AD872-4x4-60VE IBM FULL IBM11M8735CBD-60 16M x 72 (128MB), Buffered ECC - 60ns Samsung FULL KMM372F1600AK-6