前面被你誤導了

DMI 的 2GB/s 指的是雙向總頻寬

但 ALinkIII 的 2GB/s 指的是單向頻寬，也就是說其總頻寬高達 4GB/s，至少目前為止尚能應付六顆 SATA 6Gbps SSD 做 RAID 0

The rest of the chipset's connectivity is consolidated in its new SB850 south bridge component, which is connected to the 890GX via an Alink Express III interconnect that offers 4GB/s of bidirectional bandwidth—twice the bandwidth of Intel's DMI interconnect. (The 2GB/s in the block diagram above refers to one-way speed). Alink Express looks a whole lot like PCIe, and I'd wager the interconnect is little more than four lanes of PCI Express 2.0.

http://techreport.com/articles.x/18539

而且根據 anandtech 提供的照片，SB850 的面積大幅縮小(相較於 SB750)，其製程顯然比前代進步