Data Transfer Rates Depending On PCI Standard
|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:
- 1x PCI-X 133 MHz = 1066 MB/sec
- 1x PCI-X 100 MHz = 800 MB/sec
- 2x PCI-X 66 MHz = 1066 MB/sec
- 2x PCI 64 66 MHz = 1066 MB/sec
- 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.