"mSATA drives run over SATA, not PCIe. While the connector is physically identical to mPCIe, it's not transferring data over PCIe. mSATA SSDs should perform identically to SATA versions, unless corners have been cut to shrink it.
However, the new M.2 format does use multiple PCIe3.0 lanes to transfer data.
Generally, a single lane of PCIe3.0 is quite hard to bottleneck, as there's up to 1GB/s each way per lane."
"mSATA drives run over SATA, not PCIe. While the connector is physically identical to mPCIe, it's not transferring data over PCIe. mSATA SSDs should perform identically to SATA versions, unless corners have been cut to shrink it.
However, the new M.2 format does use multiple PCIe3.0 lanes to transfer data.
Generally, a single lane of PCIe3.0 is quite hard to bottleneck, as there's up to 1GB/s each way per lane."