The radiator included with the Frozen Notte 240 is 27mm, the most common size you’ll see used in liquid coolers. This should fit most cases without having to worry about space constraints. From a good deal of reading and research, I've discovered that user results have varied greatly from case to case and when using these after market frames, with some tests showing no improvement at all, some showing slight improvement and still some, as with my own example, showing rather significant improvements in CPU thermal performance.

Thermalright TFX I would say is one of the best TIM although can be harder to spread, I recommend put that TIM to hot water for few minutes prior to building the PC, but sadly this TIM can suffer as well from drying out, on my loop I have used that on one GPU and after 6 or 7 months no drying out and TIM still has a good consistency I used NT-H1 in my 3090 Eagle and the initial results were great with 70c just after repasting. However the temps kept climbing and now I'm around 80c after three months or so.GC-Extreme I was using only on older GPUs and CPUs and there performance was meh for me, sometimes was on par with EK Ecotherm or Hydronaut but sometimes was worse than cheap TIM The fans are easy to mount, the metal clips don't require much force to stretch them over to the heatsink There is also Alphacool Apex rated at 17W/mK, but the one I tried was so dry that after two attempts I just used something else. However, the results were different when paired with AMD’s Ryzen 7700X – performing only on par with high end air cooling. For this reason, I recommend the Frozen Notte 240 for cooling Intel’s i9-13900k – but not AMD’s Ryzen 7700X. ZF-EX is another great TIM for money, used that on my 5950X and on RTX 2080Ti Strix and Zotac RTX 2080Ti AMP and never had any problems with this TIM, didn't tested this TIM on RTX 3090 but I would suspect it would perform quite close to TFX or SYY-157

Liquid metal compounds make their way to the top of the temperature chart with slightly cooler values than the traditional pastes. Interestingly, the difference between the top and bottom of this chart is less than 4C. Lowering the PPT to 75W further reduces the cooling difficulty, bringing CPU temperatures down to 40C over a 23C ambient temperature. As with the previous results, when paired with AMD’s Ryzen 7700X the Frozen Notte performs on par with Iceberg Thermal’s IceSLEET X7 Dual air cooler. I'm not sure why the difference is so little between PBO without OC and PBO+OC, I thought it should be higher, also voltages seem a bit high when using Auto OC so I disabled it after the tests (it reached over 1.4v) For the air cooling low- and high-tension tests, we used a large Noctua NH-D15 air cooler. We created the low tension mount environment by torquing the mounting screws to 1.13 Nm (10 in/lbs). Measured the temperature of the CPU while using the thermal paste for the first 3 minutes while idle and calculated the idle averageI'm asymbling my new "main" rig and ran into some trouble. Skipping the story, I had to remove my HSF from the CPU and will have to do it again for further troubleshooting. I used the thermal paste that it came with and when I reinstalled, I used the last of my Noctua NT-H1. Before you start posting about how bad it is and how great liquid metal is.... I have similar results on Thermal Grizzly, Noctua NT-H2 or mentioned Streacom TX13 (and some others that I don't remember now). I had bad experience with TG as once in a while I had a dry tube and this stuff is expensive, so I'm not buying it anymore. The case was closed, also at the top (The Define C has an option to open the top plate but it was closed) When choosing a thermal paste, factors such as heat transferability, ease of application, ability to support a thin, flat, and even layer, and electrical conductivity should be considered. Why does a thermal paste with high thermal conductivity not necessarily provide better heat transfer efficiency?

Liquid metal compounds are almost always electrically conductive, so while these compounds perform better than their paste counterparts, they require more focus and attention during application. They are very hard to remove if you get some in the wrong place, which would fry your system.SYY-157 is again good paste, easy to spread, cheap and performance is on par with TFX or Kryonaut, that thermal paste will not dry out after while, used that on few builds and no issues, this TIM I was using on my another RTX 3090 and no issues, temperatures was within 1-2°C from TFX and core to GPU hot-spot delta was in 8-10°C Imposing even a minor power consumption limit on AMD’s Ryzen 7700X reduces cooling difficulty dramatically resulting in the ability to easily to cool the CPU under TJMax (95c), as such in these situations the total noise levels are more important. It’s also important to test in these TDP restricted situations, because most “real life” workloads will not push the CPU to it’s limits. For a compound that costs less than half as much as leading competitors , Phobya's Liquid Metal Compound LM offers impressive performance, often besting the the CoolLaboratory Liquid Pro or Thermal Grizzly Conductonaut in our tests.