Having a display connected or not connected will not make any difference. What will make a difference is GPU BIOS Flashing, Video Drivers & Miners (and how the miner is configured). And as said above, different algols with behave differently, you will have to test each one you want to mine to get the best out of them.
what do you mean by gpu bios flashing ? and all the miners work on the video card individually just not swapping between them, swapping caused the blocked from access.
Thought I'd try without monitors just incase, it wouldnt hurt anything so why not, well without the 2 in my case. so both are unplugged & I'm just remote accessing into the box, but so far so good. need more time to tell but so far it's not been blocked, it switched through everything on the benchmark, then went back to the most profitable one and has been chugging along.
ok answered my own question on the how to for the bios, but lead to another question of how to pick which one. I see what I currently have, but how do you know if another is better?