ULi M1575 is the south bridge for pairing up the ATi North Bridges. In this reference board, we have the  RS482+M1575. Utilizing the evolutionary PCI ExpressTM bus architecture, M1575 offers system manufacturers with unprecedented design-flexibility. It can be connected to other PCI ExpressTM North Bridge or Switch via the built-in PCI ExpressTM x4 link. With the M1575 configured as an endpoint, a PCI Express™ add-in card with M1575 on-board can easily empower any system with all the latest advanced I/O features such as SATA-3Gbps, HD Audio, 8-port USB 2.0 host controller, 10/100 802.3x MAC, and soft-modem interface etc.

M1575's USB and SATA II performance in Normal, RAID 0 and RAID 1 mode were investigated and we found that the performance levels of the RAID 0 and 1 seems to have some wins and loses when compared to the NF4 SLI chipset.

Although the M1575 seems to have what the competitor chipset has to offer, it does lack the Gigabit Ethernet/Firewall feature in the NF4 SLI chipset. M1575 also supports HD Audio which is now on MCP51 South Bridge.

Overall, the the ULi M1575 seems to be a good competitive chipset to be paired up with the ATi NB as previous ATi SB400 seems to have some USB issues. SB450 also does not support SATA2 until SB600. The natural choice for ATi NB would be M1575.

Pricing (US)

Pricing (UK)

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Pros

• USB performance
• SATA II performance

Cons

• No 1394
• No GbE

Ratings

Here are my ratings out of 10 stars.