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for example what are real IHS temps on a CPU ?
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Dunno - motherboards all read from CPU diode (ie: ondie). None read IHS temp. Only folks that'd know IHS temp are those who've added their own probe to side of IHS... and very few of those use probes that we'd be happy with - inaccurate, uncalibrated. Motherboards have same issues with ondie reading... inaccurate, uncalibrated. Differing bios revisions = differing calibrations.
Would have to choose a mobo, choose a bios rev, choose a cpu generation and speed. Stick with it for all testing. One rig for Intel, another for AMD. All testers conform. Problem will always be defining the wattage that the CPU is producing at any given moment. Time for electronics engineers to step in... find appropriate measuring points to establish incoming voltage and ampage. Find someway to provide that power smoothly rather than the ripply voltage-regs of the PC and it's PSU....
You have a PC (you're sat at one I assume)... grab a probe and measure... no-one goes to lengths shown in AMD TechDoc I linked to above to measure realworld (worthy of a read if you haven't already - s'how AMD recommends one does it for a heatsink)... everyone just whacks it on the side of the IHS or uses ondie as reported by bios / windows software.