Yeah, and that's the answer, no GPU rendering.
I'm using E3-1276V3 procesor and everything is fine.
Maybe try to add some basic video card.
The machine is currently using two NVS 510's in SLI - It uses them for rendering (verifiable via Nvidia CP) at rates of about 10-20% maximum per card.
A test using 6 simultaneous (2 per screen) 1080p youtube streams showed GPU use closer to 50% per card on average
Thank you for your reply, do you have any other suggestions?