Wow that's 16 instruments per Kontakt instance 208 instruments!  That is a ton of instruments!
 
Max Arwood

It usually doesn´t matter, cause if you don´t use any of Kontakts processing it actually doesn´t take much cpu..
 
If Sonar does anything right than it is cpu consumption. my friends here in the studios next door with Studio One and Cubase can´t open half of the plug ins and instruments like I do.
 
CPU wise, AMD is not recommended for audio productions. If you can afford to switch to an i7 you will se the difference..

There is also a way to divide and spread out the cores use more evenly. Many of us are using this setup...
it's on the CW FB page as well...
Go to preferences / Config / set thread count to 1 less then your core. set Enable set thread  idle  process to false.

The easiest way to conserve is to create your template with most of the Kontakt instances "unloaded" in the synth rack. Then as and when you need to actually use an instance just click the power button in the synth rack and it will load the instruments.

Just quick clarification to the above, the power buttons on the synth rack require the browser to be undocked to view.