iMac with dual monitors (total three)

I want to connect the iMac to additional two monitors .
So the iMac will be in the middle and one monitor on each side.

Now when I tried it , I got an error , that it's taking too much of the computer resources .

What is the est way to accomplish this?
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Eoin OSullivanConsultantCommented:
Model of iMac .. CPU and RAM?
Version of OSX?
Monitor screen size/resolution and how are they connected to the iMac?

The devil is in the details
While your mac can technically connect to 2 monitors, you may just not have a system powerful enough to power all 3 screens.
alonig1Author Commented:
Should I use a KVM? or something external?
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KVMs are not for adding monitors.  It's for sharing monitors between multiple systems.  It's still one video output.

Please answer Eoin and we might be able to figure out if it's possible to make it work.
Eoin OSullivanConsultantCommented:
iMac computers CAN support 2 external monitors but it will depend on the resolution and how they are connected .. the mini-display port and thunderbolt ports on different models have different capabilities
David AndersTechnician Commented:
Mac Model listed in "About this Mac" under Apple Menu.
Specifications are detailed at
Connecting one external monitor works? Port used? Adapter used?
Connecting just the other one works?
Connecting both gives the error message - exact error text?
Rob KnightConsultantCommented:
With 2 thunderbolt ports, you could connect 2 additional monitors via DVI, for example using the mini-thunderbolt to DVI adapters.

Not all iMacs have 2 thunderbolt ports, however.

Another option is to use a displaylink adapter which is a USB to video adapter. Best over USB3 due to the data that had to go over the USB port and there can be some lag.

Have a look at this:

Note the specs of CPU - I.e generation and minimum speed etc.
alonig1Author Commented:
The adapters I got were Insigina .

Once i got the original Apple ones it worked fine.
Eoin OSullivanConsultantCommented:
There you go!! So it was just the adapters and the iMac did support them
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