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The 7900X runs at 170W while the 7900 (without the X) runs at 65W. Despite using 60% less power, it's only 6% slower on multi-threaded tasks and 3% slower single-threaded.
On the other hand you can configure the 7900X to a 65W TDP, which turns it into a 7900.
On the seventeenth hand you can configure the 7900 to run in PBO mode which turns it into a 7900X.
On the forty-eighth hand, the 7900X comes with 32GB of free RAM. On the seventy-second hand, the 7900 comes with a fairly good CPU cooler, which is an extra cost on the 7900X. On the three-hundred and twenty-eighth hand, that cooler is only fairly good and won't suffice if you enable PBO to turn your 7900 into a 7900X anyway.
You can't. Forget it. They've cancelled the entire Optane division and these modules only ever worked on a small subset of high-end Xeon CPUs that you don't have anyway.