Hong Kong news station TVB News reported on the Hong Kong Customs and Excise Department seizing a cache of 300 “unidentified” graphics cards, which was part of a much larger haul that was intercepted from a Chinese smuggling ring. 10:52 | Hong Kong Customs Seized Smuggled GPUs The 1080 Ti is no longer in production.” The unofficial answer when we first posed the question was “HAHA! No.” Sorry to shoot that one down for 1080 Ti fans. We called EVGA and asked if the 1080 Ti was getting remade, and the official answer was “no, it is not being remade. Just as a quick update: There was a story circulating this past week about the GTX 1080 Ti allegedly being revived, particularly by EVGA, as a means to quell some of the shortage concerns. Patch Update: 09:37 | GTX 1080 Ti Revival Rumors Are False Additionally, AMD has also made patches available to the Linux kernel that allow PSF to be disabled.įor the time being, it seems this issue isn’t as big a concern as some of the other x86 speculative execution vulnerabilities, and that’s a good thing. In most cases, Phoronix found that workloads showed no more than a 1% or 2% difference in performance with the feature disabled. While it was thought that disabling PSF would carry a significant performance hit, early testing done by Phoronix finds that any performance penalty seems to be negligible. All told, AMD believes that the amount of code that may be vulnerable to PSF’s security implications is low, though AMD does suggest disabling the feature if users are concerned. This is similar to the security risk with other Spectre-type attacks,” according to AMD.įurthermore, AMD warns that software that uses isolation, or sand-boxing, may be vulnerable. This may occur if a program (such as a web browser) hosts pieces of untrusted code and the untrusted code is able to influence how the CPU speculates in other regions in a way that results in data leakage. In both cases, security concern arises if code exists that implements some kind of security control which can be bypassed when the CPU speculates incorrectly. “Because PSF speculation is limited to the current program context, the impact of bad PSF speculation is similar to that of speculative store bypass (e.g., Spectre v4). AMD then goes on to outline what it believes are the primary security concerns. AMD illustrates a couple different ways in which inaccurate prediction can occur, as well as detailing some limitations regarding speculation on Zen 3 CPUs. In the case of inaccurate speculation, the CPU is supposed to flush the incorrect results from the CPU pipeline. However, there are cases where the prediction may not be accurate and cause incorrect CPUspeculation,” say AMD in its whitepaper. Most of the time, the PSF prediction is accurate. “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. It’s similar in nature to other CPU technologies aimed at improving execution performance, such as branch prediction and speculative execution. PSF works by attempting to predict the dependency between a load and a store, and then speculatively executes instructions based on that prediction. In a new whitepaper published by AMD, the company details some potential security vulnerabilities regarding Predictive Store Forwarding (PSF), which is a feature on Zen 3 CPUs. Video embed and article follow below, as usual.Ġ6:47 | Potential AMD Zen 3 Side Channel Exploit We also reviewed the Arctic Freezer 50 CPU cooler, and detailed some of its pressure and assembly weaknesses. There’s also news regarding a massive haul of smuggled GPUs that were seized in Hong Kong, some discussion on Lenovo using AMD’s PSB feature on its servers and workstations, some commentary on a potential X570S chipset, and more.Īt GN, we recently benchmarked Intel’s UHD 750 and UHD 630 IGPs and compared them to the low-end Nvidia GT 1030. Also in AMD news is another patent filed that expands on AMD’s research into GPU chiplets, and is seemingly an improvement over the previous patent we saw earlier this year. For the time being, it mostly seems to be a non-issue, unlike the Spectre variants that have hit Intel CPUs hard. This week, we have headlining news regarding AMD research that outlines some security implications regarding Predictive Store Forwarding on Zen 3 CPUs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |