We know that the X3D chips are in fact more efficient because when you set the scheduler to prefer cache their efficiency increases further:
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Therefore the cache itself does improve efficiency and not just the frequency limits imposed on X3D processors.
I'm going to make the guess that the CPU simply can't clock as high, lowering the power consumption in the process.
Even though it's more efficient, it would likely be due to the probable lower frequency. The difference between the 7700X and non-X kinda shows this too, a 5% performance loss for a 8W(20%) power reduction.
No, it was just never apart of the conversation. It's illogical to imply that everything not discussed is purposefully being ignored.
$100 more expensive, whether that's significant is subjective.
Which is irrelevant because my argument was about the objective merits of the product. Subjective ever shifting metrics aren't really interesting, particularly on the internet where those metrics will change based on whatever argument the person wants to support.
Mentioning good points of the CPU to imply it's better than what someone thinks, while not mentioning the most obvious downside is ignoring it, regardless if it's on purpose or not.
Realistically it was more than $100, as the 7950X wasn't being sold for MSRP by the time the X3D version came to market. But anyway, how significant the difference is, is subjective, but it's in fact more expensive.
While some merits can be objective, any conclusion about a product as a whole is subjective, after all performance greatly varies depending on the tests done, and how they are done, on top of market conditions, and available options all greatly changing the conclusions.
I think the X3D CPUs can be great for many people, in particular at their own niche, but they have their own set of drawbacks, and as someone that doesn't care about any tasks that benefit from the extra cache, i would never buy them and just ignore it. Diffrent from the opinion of the user that started the discussion, I like having more options, and think overall it's a good thing, even if, like in this case it's irrelevant to me.