In the previous page SaperPL quoted a Sentry owner that used the AXP-100. It seems to work decently. At this point though I'm waiting to make any upgrades to my system until we see the final performance of the Dan HSLP48 which will be released to market by Alpenföhn as the Black Ridge. It looks very promising. Maybe it's worth just using a cheap and widely available nh-l9i while waiting to see how new low profile options perform? I guess it'll be difficult if you stick with the 9900K. Gonna need like a - 0.09V offset. Maybe even -0.1V if it's stable. Maybe disable turbo boost or set max turbo to like 4.0ghz in the meantime? Edit: Also worth noting, the 9900K power consumption and temps seem to vary from reviewer to reviewer. According to Hardware Unboxed, this comes down to the motherboard used for testing. Some motherboards have strict power limits that really cap power draw close to the tdp of the cpu. Other boards with powerful VRMs intended for OC'ing let the power limit go up to 150-200W. So you could set the power limit in bios to say, 100W. That should make things tolerable. AFAIK, when comparing clock for clock with 8th gen the 9th gen is a bit cooler thanks to solder TIM, larger die surface area to transfer heat and the 14nm+++(4x+?) process Intel is on has actually been getting larger and larger since their first 14nm. That is transistor gate pitch has been increasing (therefore transistor density has been decreasing) in order to hit higher and higher clocks. Lower transistor density means less heat packed into a small area. Sooo long story short, there's a chance with all of this taken in to account that the 9900K could be feasible in Sentry.