I too am new in this community.
I recently built a computer based on parts from Intel:
CPU: Intel Core i7-3770s Ivy Bridge
Intel 180GB 520 Series SSD
8 GB RAM
I also bought a Mediasonic Probox 4 bay storage device that i wanted to connect to my PC via USB3 or eSata. How can I determine whether my motherboard supports port multiplier?
I did not find any answer within the community.
This is an Intel sponsored board. Don't expect to find the information you're looking for here if it pertains to Intel chipsets.
If you're looking for documentation clarity and well-developed drivers...sorry, that's just not the way Intel rolls!
Snark aside, I'm fairly sure that you need to look to port multiplier support from a motherboard that has the Asmedia ASM1061 chipset. Also, make sure that the motherboard BIOS also supports the port multiplier feature. In most cases, this will be limited to 5 sata drives per the esata standard.
For reference, AMD's A75M supports port multiplier in it's tasty 6 Gbps esata form.