Difference between Radeon 5870 and Quadro 4000 and just the Radeon 5870

Hello All,

My Resolve system runs on a Mac Pro 12 core 2.93 GHz with 32 GB RAM and a Radeon 5870 in slot one and Quadro 4000 in slot two.

Since the system is running sometimes very loud especially in the beginning after startup, I had the Quadro removed for the last week because I didn't need to run Resolve. The quiet Mac Pro is a dream ...

Today I needed to grade a shot quickly in Resolve and didn't bother to put the Quadro back in again. To my surprise the system is running with almost the same speed.

Is there a possibility to check if the Quadro is being correctly utilized besides the startup warning. I know about the GPU meter but it's somehow not giving that much feedback.

Thank you!
Arty