That card is an old one, its V1 card with new bios for V1, i used under COLD but few months ago, and yes i have lot of issue with OCP, i can't push the volt over 1.5x or 1.6. don't remove exactly what V cause was like 6 months ago. About V2 revision, i has one but died.
Hope u can fix your issue.
BR
Nacho