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      AMD releases even more Ryzen 5000 CPUs, keeps its last-gen AM4 platform alive

      news.movim.eu / ArsTechnica · Monday, 8 January - 15:30 · 1 minute

    Four new Ryzen 5000 CPUs, all riffs on existing Ryzen 5000 CPUs.

    Enlarge / Four new Ryzen 5000 CPUs, all riffs on existing Ryzen 5000 CPUs. (credit: AMD)

    AMD announced the first Ryzen 8000 desktop processors today: a new lineup of socket AM5 CPUs that bring RDNA 3 integrated GPUs and an AI-accelerating NPU to its desktop platform for the first time. But the company also spent some time on new budget chips for its last-generation AM4 platform. The four new Ryzen 5000 processors cover everything from budget office desktops with integrated GPUs to cost-conscious gaming systems.

    At the top of the range is the Ryzen 7 5700X3D, an 8-core CPU with an extra 64MB slab of L3 cache stacked on top of the main CPU die. At $249, it will be a little over $100 cheaper than the 5800X3D, but with the same core count, cache size, and a slightly lower maximum clock speed (4.1 GHz, down from 4.5 GHz). AMD compared it favorably to the Core i5-13600K in gaming workloads, a chip that currently retails for a bit over $280.

    The Ryzen 7 5700 is a $175 8-core processor without 3D V-Cache that should still perform reasonably well in most workloads, though AMD's spec sheet says that it has less cache than the 5700X and only supports PCI Express 3.0 instead of PCIe 4.0. This indicates that the 5700 is actually a 5700G with the integrated graphics disabled; it will be a bit slower than the Ryzen 5700X, despite their similar names, core counts, and clock speeds. The Ryzen 5 5600GT and 5500GT are 6- and 4-core chips with Vega-based integrated graphics, both intended for lower-end systems. At $140 and $125, they essentially amount to minor clock speed bumps for the existing Ryzen 5 5600G and Ryzen 3 5300G .

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      Encryption-breaking, password-leaking bug in many AMD CPUs could take months to fix

      news.movim.eu / ArsTechnica · Tuesday, 25 July, 2023 - 16:31 · 1 minute

    Encryption-breaking, password-leaking bug in many AMD CPUs could take months to fix

    Enlarge (credit: AMD)

    A recently disclosed bug in many of AMD's recent consumer, workstation, and server processors can cause the chips to leak data at a rate of up to 30 kilobytes per core per second, writes Tavis Ormandy, a member of Google's Project Zero security team. Executed properly, the so-called "Zenbleed" vulnerability (CVE-2023-20593) could give attackers access to encryption keys and root and user passwords, along with other sensitive data from any system using a CPU based on AMD's Zen 2 architecture.

    The bug allows attackers to swipe data from a CPU's registers. Modern processors attempt to speed up operations by guessing what they'll be asked to do next, called "speculative execution." But sometimes the CPU guesses wrong; Zen 2 processors don't properly recover from certain kinds of mispredictions, which is the bug that Zenbleed exploits to do its thing.

    The bad news is that the exploit doesn't require physical hardware access and can be triggered by loading JavaScript on a malicious website. The good news is that, at least for now, there don't seem to be any cases of this bug being exploited in the wild yet, though this could change quickly now that the vulnerability has been disclosed, and the bug requires precise timing to exploit.

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      AMD announces limited-run Ryzen 5600X3D CPU, an ideal upgrade for an aging Ryzen PC

      news.movim.eu / ArsTechnica · Friday, 30 June, 2023 - 16:11 · 1 minute

    AMD's Ryzen 5 5600X3D.

    Enlarge / AMD's Ryzen 5 5600X3D. (credit: AMD)

    A surprise twist for owners of older AMD PCs using socket AM4: AMD is announcing one last (?) processor for the aging socket, a six-core Ryzen 5 5600X3D that brings the company's 3D V-Cache chip stacking technology to a $229 chip.

    The catch? The new CPU will only be available through Micro Center, a brick-and-mortar tech retailer that doesn't ship most of what it sells to online buyers. The chip will only be sold for as long as Micro Center's supply holds out, though Tom's Hardware reports that the company will have "several months'" worth of stock.

    AMD Zen 3 CPUs Street price Cores/threads Clocks (Base/Boost) L3 cache TDP
    Ryzen 5 5600 $129 6/12 3.5/4.4GHz 32MB 65W
    Ryzen 5 5600X $149 6/12 3.7/4.6GHz 32MB 65W
    Ryzen 5 5600X3D $229 (MSRP) 6/12 3.3/4.4GHz 96MB 105W
    Ryzen 7 5800X3D $289 8/16 4.2/5.0GHz 96MB 120W

    Like the Ryzen 5800X3D , the 5600X3D combines a regular Zen 3 processor die with an extra 64MB chunk of L3 cache stacked on top. Relative to its regular Zen 3 counterparts—in this case, the Ryzen 5 5600 and 5600X—the chip will consume slightly more power and run at somewhat lower clock speeds, which can make it slower than the non-X3D chips in tasks that don't benefit from the extra cache. They also have limited support for overclocking and undervolting. However, games in particular tend to like the extra cache a lot, benefitting people who want to pair a high-end GPU with the cheapest CPU that won't hold it back.

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