GPU help

Hey all, looking for some expert help. I just scored an Nvidia Quadro K6000. Since spec wise it's similar to a gtx1080, I was a little surprised that it was only able to mine (kawpow miner) at 1.48Mh. In MSI afterburner I can only adjust Mem clock and a +500 only gets me to 1.52Mh. Base specs are GPU clock if 900mhz and a memory clock of 3000mhz. I can't adjust voltage. Any help would be greatly appreciated.