The Inte i9 is THE latest thing, so very recently released that we only have sketchy information from those who managed to get to see it. Apparently th chip gets very hot. To demonstrate its amazing clock speed on challenging its limits at exhibition, two professional overclockers very carefully used liquid nitrogen to cool the chip.
To reach these clock speeds on all 8 cores as the i9 did on demonstration, liquid helium is necessary to cool the chip and this seems likely to remain the case for all in its last.