No, I really don't know. Sorry, I missed the "e" before eSATA.
Really,a SATA card should be transparent to the OS, but OS X does have disk controller drivers. I'm not sure if anything changed in Sierra as far as disk controllers, or if those cards that no longer work relied on drivers Apple removed from Sierra.
If the later is the case, then installing the drivers Apple removed form an older Mac OS should fix it.
I use a motherboard with SATA 6G, and haven't seen any troubles with my disks under Sierra, even tho Apple dropped support for my chipset with Sierra.
Check if the add in board manufacturer is offering drivers for their boards for the Mac OS, and email them and ask them if they support Sierra, if they don't have Sierra drivers listed.
Sonnet has always had good customer support.
[doublepost=1492988703][/doublepost]Hmmm....
Code:
Part No.
TSATA6-PRO-E4 Tempo SATA Pro 6Gb 4-Port
Hardware
Warranty 5-year
Bus Interface PCI Express 2.0 x4
External Connectors Four locking eSATA
Drives Supported 20(1)
Data Transfer Rate Up to 1,300MB/sec(2)
Drive Types Supported SATA 6 Gb/s, SATA 3 Gb/s, and SATA 1.5 Gb/s
AHCI Support
System OS X Windows 10, 8,7 Windows Server 2012 Windows Vista
Boot Support √(4) √ √
Port Multiplier Aware √(1) √ √ √
Hot Plug Drive √
Advanced Features
Supports ATAPI (CD/DVD) drives
Supports port multipliers under Windows 10, 8, 7, and Vista
Supports S.M.A.R.T. status data reporting
Supports Spread Spectrum Clocking for compatibility with all SATA drives and for lower EMI emissions
RoHS Compliant Yes
Package Contents
Tempo SATA Pro 6Gb 4-Port host controller card
Documentation
Specifications subject to change without notice.
image
Mac Compatibility
Mac Pro® (with card slots)
Xserve® (with PCIe slots)(5)
Power Mac® G5 (with PCIe slots)
OS X 10.5.8+
macOS Sierra compatible
Windows Compatibility
PC (with PCIe slots)(3)
Windows® 10, 8, 7, Vista
Thunderbolt Compatibility
Mac or PC via a Thunderbolt-to-PCIe Card Expansion System
Sonnet's xMac mini Server
Technical Notes
OS X port multiplier support requires Version 10.8.5+.
See Performance Tab for details.
Marvel driver required for HP Z820.
Supports booting in Mac Pro 3,1 (early 2008) and newer and any Thunderbolt Mac with a Thunderbolt-to-PCIe Card Expansion System.
Locking feature of eSATA connectors not supported in Xserve.
Mac Logo Windows LogoeSATA LogoroHS Logo
[doublepost=1492989231][/doublepost]Sonnet clearly states it supports Sierra, tho the driver download only list 10.5-10.6, but seems to be from 2013.
Nothing I know of changed with disk controllers since 2013, and if Sonnet says it supports Sierra, I don't see how you can go wrong.
I have gotten a bad product from Sonnet, once, but they replaced it with a free upgrade to a better product.