I sense a flash back somewhere...

So how about ambient temperature, humidity ? Your 1.288 run was hotter than 1.296Vcore ? Are the variables controlled in your test environment ? Nice approach mate and a nice way of putting things, but this will be a thorn in the eyes to those that have shared their, maybe to simple, data...

Other thing 4500mhz is still around the sweetspot for Ivy, most CPU's can do this easily around 1.25Vcore, there's close to no need to remove the IHS, if that is your targeted daily speed... it's above that IHS removal and reappliance of the TIM can be the difference between maxing out at 4600-4700Mhz before removal. And finally gaining 100 to 200MHz with lower temps/Vcore afterwards.

Final outcome will depend on test variables, amount of TIM, cooler pressure on IHS, amount/type of TIM used for core contact, ambients,... Far too many variables to provide 100% accurate data. However looking forward to your test results... my goal is to gain 100-200MHz and/or remain below throttling temps. If it's 90 or 91°C during Prime95 AVX enabled is not that important...

Last but not least : each CPU is unique... you can tell me you gained 5°C, good for you but I might have gained 10°C...