Two external monitors - iMac 21.5" Mid 2011

[KELLES]

Hello everyone, I know this subject may have been answered many times but after a search online i couldn't find any recent answers and since technology progresses quite quickly i was wondering if there is finally any solution to connecting two external monitors on an iMac 21.5" - Mid 2011

Currently i have one external monitor connected through the thunderbolt port.

I was wondering if i could connect a 2nd monitor using this product here

http://www.cablematters.com/pc-291-...pter-for-windows-and-mac-up-to-2560x1440.aspx


they say that it supports iMacs but will it work if i already have another display connected through the thunderbolt port?

are there any other USB to HDMI adapters that support iMacs?
[doublepost=1473417571][/doublepost]After some searching i found this thread however an answer or review is not provided but it has some useful info

https://forums.macrumors.com/threads/usb-to-hdmi-adapter.1346866/

i also found another USB to HDMI that can support MACs

https://www.amazon.co.uk/Diamond-BVU195-USB-Display-Adapter/dp/B002GHBW4S?tag=macr0e-21

 

[danielwsmithee]

Most of these devices use chips and drivers supplied by DisplayLink.

http://www.displaylink.com/

I've used USB 2.0 to DVI adapters without problems on a MBA. My MBA drove a thunderbolt display that had two monitors connected via Displaylink adapters to the USB ports on the Thunderbolt Display. So I had 4 monitors driven from my MBA. It worked OK. The refresh rate is not the greatest, it works fine for static text, email etc. Anything like video or games don't work very well.

They have a supported product page, I'd just get one of those...
http://www.displaylink.com/products/find?cat=3&vid_hdmi=1

 

[KELLES]

I've used USB 2.0 to DVI adapters without problems on a MBA. My MBA drove a thunderbolt display that had two monitors connected via Displaylink adapters to the USB ports on the Thunderbolt Display.

So is it possible to connect two monitors from one thunderbolt, i did not completely understand how did you achieve this

 

[danielwsmithee]

The extra monitor are connected via USB using USB to DVI converters that use DisplayLink chips.

The USB DisplayLink boxes were plugged into the USB ports on the Thunderbolt Display. As soon as I plugged in the Thunderbolt Display, I was connected to the Thunderbolt Display, all the USB and Ethernet connections on the display also got connected.

So the single Thunderbolt connector connected me to 3 displays (1 TB Display, +2 USB Displays), my gigabit ethernet, and speakers.