Indigo Xtreme is a really unique TIM: it has no cure whatsoever, it makes near-perfect contact almost every time, and it’s a totally different form factor. What does this mean for testing? Well, it’s the best option for doing multiple tests in one mount (like what we do for flowrate vs. temperature and all the iterations of that). Because it also gets near-perfect contact every time, it allows us to nearly isolate a block’s internals from how good of contact it makes. And with that, we can also use it to judge the quality of contact of blocks, based on how much worse they perform relative to Indigo Xtreme. Long story short, Indigo Xtreme allows us to observe performance at different flowrates, quantify the quality of contact, and directly compare blocks’ internals.
For all of the following charts, performance is based on the best mount of the block with any TIM…it just happens to reliably be Indigo Xtreme.
With Indigo Xtreme, the AC kryos HF separates itself from the CPU-370 slightly but does not keep up with the Supreme HF Full-Nickel. This indicates it makes really good contact, but not quite as good as the CPU-370. With Indigo Xtreme, there should be no difference in performance between stock o-ring and thick o-ring configurations. Reflow is more difficult with the thick o-ring, however.
It’s important to note that all flowrate/pump setting/hydraulic power spectrum tests are done with Indigo Xtreme (has zero performance change over time, unlike any thermal paste) and then justified to the blocks’ best mount.
As mentioned above, the AC kryos HF loses its lead over the Supreme HF Full-Nickel once Indigo Xtreme is used.