Shepanator

you're incorrect here. If it worked how you just said then cache coherence wouldn't be preserved which is a big no no. AMD CPUs use the MOESI protocol of which a core tenet is direct cache-to-cache transfer of data. Here is the key quote: This protocol, a more elaborate version of the simpler MESI protocol (but not in extended MESI - see Cache coherency), avoids the need to write a dirty cache line back to main memory when another processor tries to read it. Instead, the Owned state allows a processor to supply the modified data directly to the other processor. This is beneficial when the communication latency and bandwidth between two CPUs is significantly better than to main memory.

I was being general about the cache hierarchy not specific to Zen4, where you're correct that L3 is shared by all cores in a CCD however cores can also access the L3 cache of other CCDs over the infinity fabric. We both agree I just missed the word directly in your sentence "cores on one CCX can't directly access cache on another CCX" Since accessing data in the L3 cache of a foreign CCD is still a hell of a lot faster than going to system memory, it could theoretically mean that an application could run on the faster clocked cores but then still benefit from the huge cache on the other CCD, albeit with a bit of extra latency (hence why I said it would essentially be like an L4 cache). I could be wrong but I guess we will only see once it is in the hands of reviewers.

Do you have a source for that? AFAIK L1 cache is for a single core, L2 cache is shared between 2-4 cores, and L3 cache is shared across the whole CPU. In a chiplet design CPU such as Zen4 the L3 cache on the local CCD is checked first and then the L3 cache on other CCDs with a latency penalty. There is another caveat that a core can only evict data from the L3 cache on its own CCD (but it can read the L3 cache anywhere)

As far as I understand it L3 Cache is shared between CCDs (local L3 cache is checked first then the L3 cache on other CCDs), so theoretically the higher clocked cores on one CCD can still benefit from the huge cache on the other, though obviously with a latency penalty (but still a lot faster than going to system RAM). So you could kind of say the 3D v-cache is sort of like L4 cache for the higher clocked cores. With that in mind I'm very interested to see reviews & benchmarks to see if this is the case, if not I can imagine it would be very frustrating to see windows putting your game threads on the fastest clocked cores only to get less FPS than if they were on the cores which have the 3D v-cache. I wonder if the windows scheduler is smart enough to put threads which are more frequency vs cache sensitive on the appropriate cores.

Not really a feature suggestion but for the data visualisation you should look into either using Google data studio (already comes with Gsuite, is automated and works well with big datasets) or Metabase (basically an entire browser based database frontend with a GUI query builder & automated reports/dashboards with visualisation. There's an open source version which can be self hosted too)

Thanks guys! Will go for the slimmer rad then. Cheers!

Hey, I just recently obtained a Formd T1 v2 (formerly Sidearm T1) which is a mini ITX case which supports custom loops with up to 2x 240mm radiators (with some size constraints). Basically there is ~46mm thickness available for the radiator and fans, and I'm wondering what is better: a slim 20mm radiator + normal 25mm thick fans, or a 30mm thick radiator and slim 15mm fans? Has anybody done any testing on this? I thought maybe OptimumTech or JayZ on youtube but I couldn't find anything. Thanks for any help!

Hey all, it would really increase my productivity to have a bunch of programmable macro keys, but due to the industry I work in I'm not allowed to install any unapproved software or drivers. So far I've survived with a trusty Corsair K55 which has 6 driverless macro keys, but I need more! My main requirements are as follows: at least 9 keys internal memory so can work driverless (I can program it on my pc at home and then take it to work) Everything seems to be either too expensive or needs software/drivers to be installed, such as the Controlpad CP24 by Genovation (too expensive!) or this very reasonably priced option from a Chinese brand (but requires installed software) Do you know of any driverless macro pads which don't cost an arm and a leg? Thanks!

Here's the list of products which the new laws apply to (linked in OP): Basically almost every household appliance is covered it seems. Also I think splitting hairs over smartphones technically being computers is being a bit pedantic, they obviously mean desktop computers. They are just using generic language, I'm sure if you dig into the legally binding text they would be a bit more specific. I edited the OP to make this more clear

Yeah you make a really good point, the only difference between many consumer electronics of today and those of several decades ago is a major cost-down in materials & manufacturing, and if you want to be cynical a few design changes to make old parts incompatible.

maybe I'm interpreting it wrong (I'm not a lawyer, can you tell? ), but the law evaluates the overall ecological impact of the product's design based on it's efficiency, recyclability, and ease of maintenance (i.e. right to repair), so a manufacturer cannot use security as a loop hole unless it's a core function of the device that would be compromised. Your point about a fully integrated system like the new Arm Macbooks is completely valid though, if there's a RAM failure then the entire SOC is screwed.

Starting in March most household appliances sold in Europe will have to comply to new rules making them easy to repair with basic tools. As well as this manufacturers will be required to provide spare parts within 15 days and make repair manuals available to independent specialists. Notably smartphones, tablets and laptops are not yet included, but (desktop) computers, game consoles, and most types of household appliance are covered by the laws. Quote: I think this is fantastic news, and the legislation that covers smartphones & laptops as well can't come soon enough. I wonder if appliance manufacturers will start making spare parts available world-wide or only in the EU market, If they choose not to then a grey-market of spare parts trading will probably spring up, with Europeans shipping spare parts to other parts of the world. I'm particularly interested to see how Apple responds to this, their iMacs are notoriously difficult to repair and would require some considerable work to make them compliant with the new European laws. Sources: Don’t Toss It, Fix It! Europe Is Guaranteeing Citizens the “Right to Repair” Ecodesign requirements in the European Union

I bought it from this seller on Amazon (15m cat6 option) I don't see anything on the page about it's construction

Hey all, I just moved places and I noticed that I'm not getting the advertised 1gbps from my home network. Both my router and my pc are 1gbps capable, but it maxes out at 100mbps I'm using a 15 meter (50ft) cat 6 cable which was previously held to a wall with cable tacks, I unfortunately don't have another cat6 cable to test it but I assume based on what I've read that this is the problem. I've already ordered a new cable but what I'm wondering is how fragile are they really? I don't think I abused this cable but it's seen a 90% decrease in capacity versus it's spec! This concerns me because I'm planning to lay the new cable underneath a baseboard, and it would be a huge pain if it suffers a similar fate during or after installation. Is this one place where buying a more expensive cable really is worth it for the better build quality?

Hey all! I thought it would be interesting to get a sort of "census" for what computers companies are currently issuing their employees with. I work for a fintech startup in Berlin & I was issued with a macbook pro (i5 7360U - 16gb RAM) My last job before this was at Amazon and I was issued with HP Elitebook G5 (I think the 850 with an i5 7200U & 8gb RAM) I only begrudgingly use the macbook, the Windows & Linux options my company offer are outdated/underpowered in comparison. I get so many bugs, mostly to do with my monitors suddenly not being recognised by MacOS after a wake from sleep or an undock/redock. This has persisted over several updates and 2 macbooks (the first one had a usb port die) and the only way to fix it is to restart, which is inconvenient. I also had to install Smooze to fix the horrendous scroll acceleration in MacOS when using a non-apple mouse. I'm interested to hear what other companies have to offer, anything interesting or exotic? (The one guy at asus that gets issued a GX800 ?)