How did you measure temp on the ASIC chip when they're under the heat sink? (or at least I believe that they're under the heat sink

)
The ASIC's are actually on the PCB side (I think). At least that was one of the takeaways I got from
this post. As for the temp I just pointed a
laser temp probe at (what I think are) the ASIC chips.
Interestingly, the silicon around the chips are considerably warmer than the chips themselves...

Still better than some other ASIC designers' designs in terms of engineering. To my knowledge the chips are below the heatsinks, I removed the heatsink and looked at the chips and saw they were right under it. Reapplied some arctic silver afterwards, not sure of temps now but it might be a tad better than what Sidehack put on.