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  1. #1846
    Moderador Avatar de Winjer
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    AMD Zen 3 CPUs vulnerable to Spectre-like attacks via PSF feature

    A explicação técnica da AMD.

    It is common for a CPU to execute a load instruction to an address that was recently written by a store. Many modern processors implement a technique known as Store-To-Load-Forwarding (STLF) to improve performance in such cases. With STLF, data from the store is forwarded directly to the load without having to wait for it to be written to memory. In a typical CPU, STLF occurs after the address of both the load and store are calculated and determined to match.


    PSF expands on this by speculating on the relationship between loads and stores without waiting for the address calculation to complete. With PSF, the CPU learns over time the relationship between loads and stores. If STLF typically occurs between a particular store and load, the CPU will remember this. When the CPUsees the store/load pair again, it may predict that STLF will occur and speculatively forward the data from the store to the load. This is done before confirming that the store and load are in fact to the same address.


    In typical code, PSF provides a performance benefit by speculating on the load result and allowing later instructions to begin execution sooner than they otherwise would be able to. Most of the time, the PSF prediction is accurate. However, there are cases where the prediction may not be accurate and cause incorrect CPU speculation.
    https://www.amd.com/system/files/doc...forwarding.pdf


    A AMD recomenda usar "hardware-based sandboxing" ou em certos casos, desligar o PSF.
    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  2. #1847
    Moderador Avatar de Winjer
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    AMD ramps up Ryzen 5000 supply to counter Rocket Lake availability advantage


    A report out of China has claimed that AMD Ryzen 5000 parts will have greater availability in the second quarter of this year. According to ChannelGate (via MyDrivers), Team Red has managed to bump up supply by 20% to try to deal with the demand for Zen 3 desktop processors. While a 20% increase over the first quarter in terms of supply will still be far from meeting all consumer requirements, it is at least a step in the right direction.


    Whether AMD sees Intel’s Rocket Lake as a direct threat to Ryzen 5000’s continued success or not is irrelevant at the present time because of the issues with availability. While many reviewers have been collectively shaking their heads at the 11th Gen desktop parts from Intel, especially in regard to the top-end i9-11900K SKU, it seems likely many desktop PC builders will resort to a purchase simply out of frustration or discontent with the AMD chip shortage.


    AMD has had to deal with huge chip demands, as it’s not only Ryzen 5000 that has been snagging all the available 7nm silicon coming from TSMC’s fabs. Both Microsoft and Sony have been knocking on AMD’s door for the custom processors required by the Xbox Series X|S and PlayStation 5 consoles, and of course Team Red has also upped the
    demand itself with the release of Zen 3 EPYC Milan server chips. Hopefully, those looking for one of the powerful high-end Ryzen 9 5000 processors will soon be able to find something priced closer to MSRP.
    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  3. #1848
    Moderador Avatar de Winjer
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    Novos APUs com Zen3, mas lançados apenas para OEMs....














    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


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  5. #1849
    Moderador Avatar de Winjer
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    AMD Chipmaker TSMC to Use AMD Chips for Chipmaking

    TSMC has tapped AMD to support its major manufacturing and R&D workloads. AMD will provide its Epyc Rome 7702P CPUs – with 64 cores operating at a base clock of 2.0GHz – implemented in HPE’s single-socket ProLiant DL325 G10 server platforms. This is a bit of a role reversal for the two companies, as TSMC manufactures AMD’s Epyc 7nm Rome and Milan chips.


    TSMC supplies a vast portion of the world’s processing power, and its own enterprise computing is mission-critical and virtually uninterruptible. Like any company over time, however, TSMC has found itself in need of an upgrade – a process it detailed in a recent case study. The previous-generation datacenters had been space- and power-limited, said Simon Wang, director of the Infrastructure and Communication Services Division at TSMC.


    The AMD Epyc Rome 7702P CPU.
    With efficiency and ease of integration in mind, TSMC began hunting for hardware to suit its needs, beginning with an initial deployment for TSMC’s general workload. Eventually – and, TSMC says, uninfluenced by AMD’s customer status – the company landed on the AMD Epyc processors housed in HPE servers.


    “Compatibility was the key factor before we started the large-scale deployment [of AMD’s CPUs],” explains Wang. “We had thorough discussions with HPE, and the AMD product was readily available to use directly on our existing architecture, reducing the cycle time. Otherwise, we need to do more testing, and that will significantly increase the time to deployment.”


    “Performance-wise, we had no doubt,” he continued. “We tested [the CPUs] with key applications and performance was excellent. For manufacturing and the general workloads for support functions, there has been no issue with compatibility.” Memory density was another priority for TSMC, and the company was pleased with the performance of the AMD hardware on that front: in testing, the virtual instances required fewer resources and achieved improved performance. These efficiency improvements allowed TSMC to provision fewer servers, saving space and power.


    TSMC’s Workloads


    TSMC’s various divisions use its datacenters for a variety of purposes, ranging from research and development to the actual operation of the fabrication equipment. Much of this work is done through virtual machines, allowing the datacenters to be located offsite. “We designed and implemented the virtualization of the computing, storage and network, and all of that in our standard template of service architecture,” Wang explained. “I need to find products that can be directly introduced into this standard template, and then deploy them quickly across our datacenters, without redesigning the architecture.”


    “For automation with the machinery inside our fab, each machine needs to have one x86 server to control the operation speed and provision of water, electricity and gas, or power consumption,” he said. “These [production] machines are very costly. They might cost billions of dollars, but the servers that control them are much cheaper. I need to make sure that we have high availability in case one rack is down, then we can use another rack to support the machine.”


    “In addition to virtualization, we also have other software,” he elaborated. “For instance, there is path alternation protocol, PAP, that we use for controlling the communication between production machines and the virtual servers. When a server goes down, PAP automatically connects the machines to another VM server in the same cluster.”


    What’s Next


    Following a successful deployment for the general workload, the AMD rollout is now continuing across the company through installations in the manufacturing and R&D teams. TSMC might change up the AMD hardware in play, and it currently has its eye on the 24-core AMD Epyc Rome 7F72, which has a base clock rate of 3.2GHz.


    “That’s the CPU we’re considering for R&D, because of the high clock rate,” Wang said. “This team doesn’t necessarily need more sockets or cores. For R&D, if we use two sockets, that might create unexpected effects, because it means one CPU needs to communicate with another CPU, which will create overheads. So, for R&D, we choose a one-socket CPU and the high clock-rate will be an important advantage.”


    And that’s not all TSMC has planned on the hardware upgrade front, either. “Two more datacenters will be implemented [with the AMD/HPE technology] in 2021,” Wang said. “One in Tainan, the other in Hsinchu.”
    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


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  7. #1850
    Moderador Avatar de Winjer
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


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  9. #1851
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  10. #1852
    Moderador Avatar de Winjer
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  11. #1853
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  12. #1854
    Tech Veterano Avatar de MTPS
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    CPU bem porreiro!

  13. #1855
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  14. #1856
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    Análise ao Ryzen 5700G

    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  15. #1857
    O Administrador Avatar de LPC
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    Citação Post Original de Winjer Ver Post
    Análise ao Ryzen 5700G

    Boas,
    Tal como o meu, é uma alternativa apenas por causa do IGP, mas mesmo assim não sei se compensa.

    No meu caso tenho o modelo anterior com os cores Zen 2+ (portanto 3600), mas visto ter menos cache perde sempre um pouco...

    Mais vale pensar num 5600x ou 5800x com um gpu daqueles básicos por mais 50€ ou algo, do que pensar no IGP como uma alternativa a sério...

    Talvez o seja quando for arquitectura RDNA2 agora VEGA?... Nem pensar...

    Cumprimentos,

    LPC
    My Specs: .....
    CPU: AMD Ryzen 7 5800X3D :-: Board: MSI B550M BAZOOKA :-: RAM: 64 GB DDR4 Kingston Fury Renegade 3600 Mhz CL16 :-: Storage: Kingston NV2 NVMe 2 TB + Kingston NV2 NVMe 1 TB
    CPU Cooling Solution: ThermalRight Frost Commander 140 Black + ThermalRight TL-C12B-S 12CM PWM + ThermalRight TL-C14C-S 14CM PWM :-: PSU: Corsair HX 1200 WATTS
    Case: NZXT H6 FLOW :-: Internal Cooling: 4x ThermalRight TL-C12B-S 12CM PWM + 4x ThermalRight TL-C14C-S 14CM PWM
    GPU: SAPPHIRE
    NITRO+ AMD RADEON RX 7800 XT - 16 GB :-: Monitor: BenQ EW3270U 4K HDR


  16. #1858
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  17. #1859
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    Análise ao Zen+ 6000 mobile

    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


  18. #1860
    Moderador Avatar de Winjer
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    Ryzen R5 3700X / Noctua NH-D15 / B550 AORUS ELITE V2 / Cooler Master H500 Mesh / 16Gb DDR4 @ 3800mhz CL16 / Gigabyte RTX 2070 Super / Seasonic Focus GX 750W / Sabrent Q Rocket 2 TB / Crucial MX300 500Gb + Samsung 250Evo 500Gb / Edifier R1700BT


 

 
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