AMD Ryzen 9 9950X3D2 review: More cache, more cash

A terrible value, but one of the most unique CPUs we’ve ever reviewed.

AMD Ryzen 9 9950X3D2
(Image credit: © Tom's Hardware)

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AMD Ryzen 9 9950X3D2

(Image credit: Tom's Hardware)

The Ryzen 9 9950X3D2 is living proof that, in CPUs, more isn’t always better. It all comes down to what you plan to use your PC for. In games, the Ryzen 7 9850X3D is faster for $400 less. And in applications, the Ryzen 9 9950X3D delivers a much better value with largely similar performance and a price that’s around $250 less at the time of writing. But we’re talking about a $900 CPU here, where marginal gaming leads and price-to-performance go out the window. This is a CPU you buy if you want the best of the best, and it delivers on that front, no matter how marginal those advantages are from a 10,000-foot view.

The jump in performance rarely goes into the double-digit range over the 9950X3D, but it occasionally does. And those applications are what matter for the 9950X3D2. It’d be one thing if we saw a 5% improvement across the board with a binned CPU; that’d make sense for a KS-style CPU from AMD. But we’re actually seeing some much larger increases in performance, just in highly specialized workloads.

AMD Ryzen 9 9950X3D2

(Image credit: Tom's Hardware)

There’s no clear advantage in games, but AMD never claimed there would be. The biggest feat the Ryzen 9 9950X3D2 could achieve is keeping pace with the other Zen 5 X3D CPUs, and sure enough, it keeps pace without any problems. No, it’s not as fast as the Ryzen 7 9850X3D, but it might as well be. Looking at all of the Zen 5 X3D CPUs, you’re getting top-shelf gaming performance, short of maybe the Ryzen 9 9900X3D.

AMD Ryzen 9 9950X3D2

(Image credit: Tom's Hardware)

In overall application performance, the Ryzen 9 9950X3D2 looks like that KS-style chip, offering a minor 3.9% jump over the 9950X3D in multithreaded performance when taking common workloads into account. It’s the best of the best, even if only by a bit. The strength here, however, comes from those specific workloads, like data science, where the Ryzen 9 9950X3D2 really shoots ahead.

I wouldn’t recommend the Ryzen 9 9950X3D2 to most people, but that doesn’t mean it’s a bad chip. It’s a unique offering with some (highly specific) upsides, and although it’s expensive, it only appeals to a group of buyers who need that compute power, no matter the cost. I hope AMD doesn’t double down on dual-cache CPUs simply because 3D V-Cache has become somewhat of a brand, but for the 9950X3D2, it’s hard to deny that it works.

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Jake Roach
Senior Analyst, CPUs

Jake Roach is the Senior CPU Analyst at Tom’s Hardware, writing reviews, news, and features about the latest consumer and workstation processors.

  • Gururu
    How was it decided to find a bunch of obscure benchmarks that are rarely used in CPU testing? Seems like a little voice whispered in someone's ear...
    Reply
  • Marlin1975
    Seems like a chip that with the right software will be a beast. I'm assuming since most is not written for this much cache its left spinning its wheels when it has more to go.
    Reply
  • yznc
    Admin said:
    The Ryzen 9 9950X3D2 is one of the most unique CPUs we’ve ever reviewed, and although its price feels like a kick in the gut, it offers some interesting, highly specialized improvements in certain workloads based on our testing.

    AMD Ryzen 9 9950X3D2 review: More cache, more cash : Read more
    Very nice and informative article! Can I get a clean pdf version for education use? Thank you!
    Reply
  • JakeRoach
    Gururu said:
    How was it decided to find a bunch of obscure benchmarks that are rarely used in CPU testing? Seems like a little voice whispered in someone's ear...
    It's the same list of benchmarks we use in every review, AMD and Intel.
    Reply
  • Gururu
    JakeRoach said:
    It's the same list of benchmarks we use in every review, AMD and Intel.
    Yes, I don't see anything wrong. It's just a little confusing on the SPECWorkstation 4 Benchmarks where if you compare the 270K review to this review, some tests seem different. Maybe they are just listed in a different order.
    Reply
  • TerryLaze
    Marlin1975 said:
    Seems like a chip that with the right software will be a beast. I'm assuming since most is not written for this much cache its left spinning its wheels when it has more to go.
    Cache is completely transparent (invisible) to apps, they either have enough data to fill the cache or they don't.
    You would need to invent an app that causes the problem of needing that much cache for it to use that much cache. (Which is what a lot of the benchmarks do, they use a lot more data (or at least coherent/fixed amount of data that never needs to change) than what a normal real world usage would be)
    Reply
  • zworykin
    Not "one of the most unique" CPUs you've reviewed. It's unique, or it isn't. There are no degrees of "more unique" or "less unique" - it's a binary concept.
    Reply
  • drea.drechsler
    "A terrible value, but one of the most unique...isn’t worth the money for the vast majority of people, but it was never meant to be. It’s a halo product.....one of the most unique .... ever reviewed, and although its price feels like a kick in the gut...."

    Sounds like summary statements appropriate to an Nvidia GPU reviews.
    Reply
  • qxp
    TerryLaze said:
    Cache is completely transparent (invisible) to apps, they either have enough data to fill the cache or they don't.
    You would need to invent an app that causes the problem of needing that much cache for it to use that much cache. (Which is what a lot of the benchmarks do, they use a lot more data (or at least coherent/fixed amount of data that never needs to change) than what a normal real world usage would be)
    No need to invent anything. If you just consider an app that at its core does FFT or vector arithmetic then as soon as the size of the data is larger than cache of 9950 but smaller than 9950X3D2 you will see a big difference in speed.

    The reason you don't quite see this in charts of this article is because most apps are in two categories - either they are written without much attention to performance, in which case they spend most time in CPU executing some byte code or inefficient loops and the extra cache does not matter.

    Or they have been well optimized and part of that optimization was to fit them into the cache of the CPUs they were designed for, and the case of my data is larger than cache was treated as a slow path.
    Reply
  • bit_user
    Thanks for the comprehensive benchmarks! I had always wondered how such a product would perform - now I know!

    In your intro, I didn't notice a reference to why AMD said they didn't offer this before. I'd have to go searching for it, but they've previously said they didn't think it would be cost-effective. It seems they were right.

    I'm glad to see very few regressions vs. the 9950X and 9950X3D, however. That means it's a safe buy for someone who wants the top AM5 multithreaded performer, if money is no object.
    Reply