Yeah, 5 Gb of 8b/10b, same as USB 3 gen 1. And real world I’d expect like 300-400 MB/s if x1’s supported, depending on the PHY’s architecture.
Correct. For two port SATA the most common PCIe bridges are
- ASM1061: PCIe 2.0 x1 so likely ~200 MB/s max concurrent to two drives; fine for older 3.5s, won’t keep up with current 3.5s or 2.5 SSDs
- ASM1062: PCIe 2.0 x2; likely ~400 MB/s max concurrent
- JMB582: PCIe 3.0 x1; likely also ~400 MB/s max concurrent
Also, as shown, M.2 doesn’t support much of a heatsink for the bridge controller and 2230 SATA cards lack mechanical support for the connectors.
In general, an ASM1166 on 3.0 x2’s the preferred building block as it saturates at ~1.7 GB/s split up among the drives. I prefer the x4 PCIe cards but see also the ASM1166 M.2 thread.
The ASM1164’s also 3.0 x2 but much less commonly used than the ASM1166. Wouldn’t bother with the JMB585.