E7505/Placer Chipset Technology In Detail, Continued

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The P64H2 bridge, on the other hand, operates at 133 MHz according to the HUB 2.0 protocol. This speed can accommodate data transfer rates of up to 1 GB per second over a 16 bit wide bus. Furthermore, the E7505 has a dual memory interface as well as an AGP 8x interface.

The ICH4 Southbridge from Intel

The ICH4 (82801DB) Southbridge, based on a 250-nm process, offers connectivity for six USB 2.0 ports, four ATA100 drives, a 100 MBit LAN chip, an AC97 sound decoder and support for a maximum of six PCI master devices, each with 133-MB per second bandwidth.

Intel's P64H2 Southbridge

Things work differently with the P64H2 (82870P2) Bridge. It was designed for the fast PCI 64 and PCI X interfaces. The PCI 64 interface corresponds to Version 2.3. Both operate in 64 bit mode. All motherboards with an E7505 chipset in the WTX format have connection possibilities for a maximum of three PCI 64 and one PCI X cards. PCI 64 operates either with 33 MHz or 66 MHz, resulting in transfer rates of between 266 MB/sec and 533 MB/sec (maximum). In comparison, the PCI X operates with 66 MHz, 100 MHz and 133 MHz. Data transfer rates of between 533 MB/sec and 1066 MB/sec are reached.

Block diagram of the E7505 chipset with P64H2 Southbridge

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