To be honest I expected A LOT more from them than I got. In their defense, they're EASY to use and install - they come with thermal pads that can be glued directly to the heatsink and thrown anywhere. In this case I threw it at a 2070 Super which was getting a little warm due to another card directly underneath. You can see I have three of these aluminum heatsinks on the top of the backplane. I can definitely say they do SOMETHING because they feel hot, but even with that passive cooling (and a fan pointing next to them) they just fell off. my gpu vram temps at 1-2 celsius. In other words, don't expect miracles! I might need a fan resting right on top of them to really get the job done, but who knows!