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Data Transfer Rates Depending On PCI Standard

Two Xeon CPUs Are Better Than One Intel P4 Extreme Platform
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Standard Bit Clock Transfer rates
(bi-directional)
PCI 2.3 32 Bit 33 MHz 133 MB/sec
PCI 2.3 32 Bit 66 MHz 266 MB/sec
PCI 64 64 Bit 33 MHz 266 MB/sec
PCI 64 64 Bit 66 MHz 533 MB/sec
PCI-X 1.0 64 Bit 66 MHz 533 MB/sec
PCI-X 1.0 64 Bit 100 MHz 800 MB/sec
PCI-X 1.0 64 Bit 133 MHz 1066 MB/sec
PCI-X 2.0 (DDR) 64 Bit 133 MHz 2132 MB/sec
PCI-X 2.0 (QDR) 64 Bit 133 MHz 4264 MB/sec
PCI-Express 1 Lines 8 Bit 2.5 GHz 512 MB/sec
PCI-Express 2 Lines 8 Bit 2.5 GHz 1 GB/sec
PCI-Express 4 Lines 8 Bit 2.5 GHz 2 GB/sec
PCI-Express 8 Lines 8 Bit 2.5 GHz 4 GB/sec
PCI-Express 16 Lines 8 Bit 2.5 GHz 8 GB/sec

The HUB 2 connection offers a maximum data transfer rate of 1 GB per second between Southbridge and Northbridge, the following combination possibilities resulting for a maximum interface load for a P64H2 chip:

  1. 1x PCI-X 133 MHz = 1066 MB/sec
  2. 1x PCI-X 100 MHz = 800 MB/sec
  3. 2x PCI-X 66 MHz = 1066 MB/sec
  4. 2x PCI 64 66 MHz = 1066 MB/sec
  5. 3x PCI 64 33 MHz = 798 MB/sec

Standard cards do not exhaust data transfer rates of 1,066 MB per second. Only high-performance products, such as SCSI320 cards (320 MB/s) or 10 GB LAN chips (max. 1250 MB per second), would be sensible candidates.

Many PCI cards are capable of performing their services not only with conventional PCI 2.3 slots, but also with a PCI 64 slot. Examples of these are network cards, RAID controllers and even 56K modems. In order to avoid incorrect configurations, they have an additional notch on the connection contacts.

A 56K modem for a 64 bit slot

The 56K modem operates here with conventional 33 MHz in 32 bit mode.

A Promise SATA controller for a 64 bit slot

This Raid controller can handle even 66 MHz in 32 bit mode.

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