Sorry for the late reply.
600 mg. Recommended dose is twice daily, but I have slackened off a bit since I started taking it due to a bout of flu. Also, I didn't mention that I was taking Lyrica for 2.5 years. I quit about 6 months ago after reading it can exacerbate tinnitus. So I may still be...
I was prescribed PEA for nerve pain and I had no luck with it. But I did notice it took the edge off my tinnitus - for about 4 hours. I now use it regularly and I find it helps. I get maybe a 25-30% reduction in perceived loudness, which means it doesn't drive me mad constantly.