There's a reason why this CPU is being offered for less than even the R9-7900 and that reason is the fact that the R9-7900X3D is easily the worst Zen4 CPU ever produced.
I said it when it was released and I still say it now. The Ryzen 9 X3D CPUs were a huge mistake on AMD's part and the cynicism of its creation really irked me. The R9-7900X3D is especially bad as there's literally nothing that stands out about this CPU to make it compelling to anyone.
The R9-7950X3D is at least compelling as AMD's current flagship CPU (overall, it still sucks though).
The R9-7950X is compelling as the most potent productivity CPU that AMD currently produces.
The R9-7900 offers the best overall value in the Ryzen 9 lineup along with the lowest power draw (TDP of only 65W) and comes with the Wraith Prism included, a CPU cooler that can easily handle it.
The R9-7900X3D can't game as well as the R7-7800X3D, it's not as productive as the R9-7900 or R9-7900X because of the clock and power limitations imposed upon it by the 3D V-Cache, something that has no place on a CPU that is most suited to productivity. The 3D V-Cache is also only on one of the R9-7900X3D's two CCXs which means that it's essentially a hexacore gaming CPU that can experience scheduling issues. Now, at $329, at least its price is compelling, because nothing else about it is.
Whoever made the decision to produce this CPU and price it the same as the R9-7950X instead of creating twice as many R5-3600X3D's should have had their employment at AMD terminated because it was literally the worst thing that they could do. High prices on AM5 parts literally crippled its adoption rate and this was only compounded by the fact that, until the R7-7800X3D was introduced, there weren't any really compelling CPUs for AM4 owners to upgrade to, because the R7-5800X3D is so damn good.
When you're a chipmaker that has adopted the practice of long-lived platforms (like AM4 is and AM5 is supposed to be), what you want is to get as many consumers on board as you can because they become a captive audience. I would estimate that over 90% of AM4 owners had the sense to stay with AM4 the whole way because being able to drop a CPU like the R7-5700X3D or R7-5800X3D into a motherboard from 2017 and get fantastic gaming performance without needing a new board or RAM is a huge boon for most consumers. This strategy not only brought AMD back from the brink of insolvency, it turned them into the market leader in less than five years, a turnaround that has never before been seen in the industry. If you had told me just ten years ago that AMD would be the CPU market leader after Intel had held a stranglehold on the CPU market for over 30 years, I would've asked you what drugs you were on (and where could I get some).
All AMD had to do to make AM5 an unmitigated success was to limit the 3D V-Cache to Ryzen 5 and Ryzen 7 models. Their pricing strategy was that an X3D CPU would be the same price as the X CPU from the tier above like this (with the exception of the R9-7950X3D of course because it was already the top-tier):
$R9-7900X3D = $R9-7950X
$R7-7800X3D = $R9-7900X
So, all AMD had to do was this: $R5-7600X3D = $R7-7700X and their adoption rate would have increased by a minimum of 50% with a doubling of the adoption rate not out of the realm of possiblity. Even if they didn't make huge profits initially, they would know that the users who adopted AM5 would be buying only AMD CPUs for the life of the platform. It's like Sony's brilliant tactic of making no profit (or even taking a loss) for every Playstation sold because they knew that someone who bought a Playstation would have to buy games (which is where they raked in massive profits). One cannot deny the success of Sony's method when one considers that the Playstation is the undisputed console king, holding a 57.5% share of the US console market.
An R5-7600X3D for the same price as the R7-7700X would've been a guaranteed home run for AMD. Instead they decided to bunt with the Ryzen 9 X3D CPUs (especially the R9-7900X3D) and this is the result, their attempted cash-grab is sitting on the shelves gathering dust just like the RX 7900 XT, RX 7700 XT, RTX 4060 16GB and RTX 4080 did.