Because I have been using the same hardware for nearly a decade.. I was not able to run prime 95 let alone linpack xtreme at 4400 with my x5690 and D14. I can do that with my Le Grand Macho RT, and True Spirit 140 Power, but I need to use TY-143. Don't know about prime because I gave up on that many moons ago. Without TY-143 the three are about the same performance with this CPU. Id still give the edge to LGMRT, it really is good. I had TS140P on earlier today, performance was excellent, but with my fan config I got just a hair better performance with LGMRT. Less than 5c, and its only because its such a large cooler, it can use the crapload of air I can move through my case. And the coldplate is a touch nicer.
X5690 E.S. @ 4200MHz 1.35v/Thermalright Le Grand Macho RT/TF8/TY-143
Asus Rampage III Formula @ 200/3600/3600 Bios 0702/Intel 545S 256GB x2
16GB G.Skill + Super Talent Mix @ 800MHz 9-9-9-24 2T 1.6v
EVGA GTX 980 Classified 3988 @ 1490/1900|Asus Xonar Essence ST/KEF M500
CM Silent Pro M2 850|Fractal Design Meshify C/Panaflo NMB x3/ZM-MFC2