The Intel® 865G Chipset consists of the following devices: Intel 82865G Graphics and Memory Controller Hub (GMCH) with Accelerated Hub Architecture (AHA) bus Intel 82801EB I/O Controller Hub (ICH5) with AHA bus Intel 82802AB (8Mbit) Firmware Hub (FWH)

The ICH5 provides support for all eight USB 2.0 ports.

• Four ports are stacked beside the PS/2 ports on the rear of the motherboard.
• Two ports are stacked under the network interface card (NIC) on the rear of the motherboard.
• Two ports are routed through the front panel USB connector.

The ICH5 Parallel ATA IDE controller has two independent bus-mastering parallel ATA IDE interfaces that can be independently enabled. The Parallel ATA IDE interface supports the following modes:

• Programmed I/O (PIO): The processor that controls data transfer.
• 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 megabytes per second (MBps).
• Ultra DMA: DMA protocol on IDE bus that supports host and target throttling and transfer rates up to 33 MBps.
• ATA-66: DMA protocol on IDE bus that supports host and target throttling and transfer rates up to 66 MBps. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.
• ATA-100: DMA protocol on IDE bus that allows host and target throttling. The ICH5-R ATA-100 logic can achieve read transfer rates up to 100 MBps and write tranfer rates up to 88 MBps.

The motherboard supports Laser Servo (LS-120) disk technology through the parallel ATA IDE interfaces. The BIOS supports starting from an LS-120 drive.

The ICH5 Serial ATA controller offers two independent serial ATA ports with a theoretical transfer rate of 150 MBps per port.

RAID level 0 is supported on the serial ATA ports through the ICH5 in Microsoft® Windows® XP only. Two physical drives of identical size can be teamed together to create one logical drive. As data is written to or retrieved from the logical drive, both drives operate in parallel, thus increasing the throughput.