Just out of curiosity I opened up Sonar and loaded several soft synths (Hybrid, TAL Elektro, Addictive Drums, and Cthulhu) as well as several plugins with graphic displays (Voxengo Span, CA-2A, LP-MB. Melda MOscilloscope, and Pancake2). 
 
My baseline graphics properties looks like this (Intel HD Graphics 2500):
 

 
Using GPU-Z my graphics memory use looks like this while running Sonar:
 

 
So my dedicated video RAM is 32 MB, but while running Sonar, it seems to average below 200 MB.  It looks like the graphics adapter could allocate up to 1.792 GB RAM, but that is unlikely just using a DAW. 
 
So that still is not a very big chunk of my system memory... no worries!

I have been very happy with prior builds with Intel innards, and also very happy with current and last 4 builds with AMD innards.
 
I get GREAT bang for the buck going the AMD route, and have no performance or reliability issues with AMD, and also had none with Intel builds.
 
On-board graphics for me with a high-end AMD CPU has been a winning combo for me for years now.  My last Intel build used an i7-2600k. and my current build uses an AMD A10-7850k CPU, and with the money saved I got 32 GB of memory and an SSD primary drive.
 
Bob Bone