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AMD Ryzen 7000X3D CPUs Launched: Ryzen 9 7950X3D Offers Big Gains and Efficiency...

 1 year ago
source link: https://hardware.slashdot.org/story/23/02/27/2219202/amd-ryzen-7000x3d-cpus-launched-ryzen-9-7950x3d-offers-big-gains-and-efficiency
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AMD Ryzen 7000X3D CPUs Launched: Ryzen 9 7950X3D Offers Big Gains and Efficiency

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MojoKid writes: At CES 2023, AMD unveiled an array of Ryzen 7000 series Zen 4 processors, including new gaming-targeted X3D models that featured integrated 3D V-Cache, similar to the Ryzen 7 5800X3D. The processors go on sale tomorrow, but review embargos for AMD's latest socket AM5 flagship, the Ryzen 9 7950X3D, lifted today. As its name implies, the new Ryzen 9 7950X3D has a similar core configuration to the existing Ryzen 9 7950X (16-cores/32-threads), but this specialized CPU also packs an additional 64MB of 3D V-Cache, fused to one of its 8-core compute core dies (CCD). The CCD without 3D V-Cache operates like a standard AMD Ryzen 9 7950X, while the 3D V-Cache enabled CCD will have a more conservative voltage and frequency curve. Gaming performance received a massive boost with this new CPU, while multi-threaded content creation tests are roughly in-line with the standard 7950X. Power efficiency also shows a large, measurable improvement due to the chip relying less often on system memory.

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You're going to need to be on the latest available BIOS and you'll need software (essentially the XBox bar) to get the most out of it.
Mainly because what it does is shuts off half the cores, as the amount of memory per chiplet isn't symmetrical.

This kinda argues against the 7950 X3D from a pure value standpoint.
Especially since the core frequency is lower than the standard X chip.

Now the 7900 may be a better value, as you deal with fewer cores that aren't impaired by this behavior.

But the 7800 will likely see negatives as it's supposed to be down-clocked from the X variant.

Hopefully the next-gen version of the X3D will function more like E--core/P-Core architecture. So that the OS just KNOWS which cores see the extra cache and can select them based on gaming/productivity parameters.

Still, when the extra memory means something, it REALLY means something.

  • by Guspaz ( 556486 ) on Monday February 27, 2023 @07:50PM (#63328771)

    > But the 7800 will likely see negatives as it's supposed to be down-clocked from the X variant.

    On the contrary, the 7800X3D avoids all these scheduling problems requiring special software support and game bar and such because it doesn't have heterogeneous chiplets like the 7900X3D and 7950X3D. Both of which advertise their boost clocks based on their non-X3D chiplet. I'm not sure what the real X3D boost clocks of the 7900X3D or 7950X3D are, but the 7800X3D and 7950X3D have the same base clock, so their X3D boost clock is probably not too different.

    • Re:

      > the 7800X3D avoids all these scheduling problems requiring special software support and game bar and such because it doesn't have heterogeneous chiplets like the 7900X3D and 7950X3D

      Exactly. HUB (Hardware Unboxed) benchmarked a simulated 7800X3D [youtu.be] by disabling the second CCD on the 7950X3D in BIOS calling it a "7800X3D simulated". With Factorio results were:

      * 5800X3D = 352 FPS
      * 7950X3D = 249 FPS
      * 7800X3D simulated = 433 FPS

      > I'm not sure what the real X3D boost clocks of the 7900X3D or 7950X3D are,

      • Re:

        I'm always reticent to put any store in "simulated" benchmarks.
        We'll see when the part actually makes it to market.


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