My Asus ROG G551VW with a GTX960M was constantly thermal throttling down to 405-600MHz (from a base clock of 1096MHz), resulting in PPD anywhere from
12k-30k PPD.
I just installed a cooler and now it's running at a constant 1087MHz core clock. PPD went up to 88k. Much better than I expected. But of course YMMV with different configurations

Here's what it looks like for reference (not mine, but pretty much the same thing)
