AnandTech review:
www.anandtech.com
In summary:
A beast in productivity apps:
Intel still reigns supreme with single thread performance:
Conclusion:
There also seems to be a bit of a binning issue, with some getting way higher/sustained boost clocks compared to others, e.g. gamersnexus and anandtech seem low, while e.g. tomshardware and pual seem to have gotten better chips where the difference for single-threaded is within the 5% margin.
It just smooths out the difference a bit, and you need to take into account the 9900KS either hits 5GHz or sticks within its TDP limits and it costs about $600, so with cheapest mobo around $850 (so that begs the question whether influenced by 9900KS being limited by TDP or unlocked and breaking). The 3950X is $750 (not sure if with taxes?), you can get a good enough motherboard at $200, so $950. If you're spending that much, I don't think you really care about the $100 difference and you'd probably spend more on both motherboards.
And if you have this much cash, you probably have a good GPU, so the couple of fps difference doesn't matter, and most of the 1% lows are higher on the 3950X and it has less frame-time variance.
Either way, for only gaming, for most of us the 9900K or KS or anything above basically a 3800X is overkill, your choice should rather be 9700 vs 3700X where I'd personally prefer the latter. If you're going above that productivity is usually included, so 3950X should generally be the better buy.
Also, I don't think AMD is going to put a lot of these up for sale, nor will they have a lot of thread rippers, they can probably sell most of their stuff as Epyc CPU and make way more money as their chiplet design allows a lot of leeway for non-perfect wafers, the 3950X is the only chip in the 3000 series that actually has all cores in all CCX enabled. Intel also won't sell a lot of 9900KS, there's a lot of binning involved, supposedly stocks won't be replenished after christmas.
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