You have a 450 G1. Completely different hardware (two generations later). Temperatures under load with Haswell cannot be compared with Sandy Bridge.
In a high ambient temperature environment under extreme load, it is not unreasonable to have temperatures in that range, especially using the stock thermal compound. The ioreg and HwMonitor screen shot show extreme load on both the CPU and IGPU. The fan patch chosen for DSDT can also have an impact. The "silent" patch prioritizes low fan speeds over high temperatures.
Replacing the thermal compound (AS5 or better) and cleaning the cooling system is always advised, but is not within everyone's skill set.
But post #1 claims the system is running at this temperature "all the time." (read post #1 carefully) Which, to me, indicates a software problem. Likely driver/3rd party software with runaway CPU use. A fresh install or careful elimination of suspected software might help find the culprit and narrow down the issue.