Which forthcoming high end PC SSD do I need to buy(say price is no barrier) for my pretty crappy PC to get it to perform above the performance(fps, resolution, graphics settings, AI behavior etc..) of the PS5 do you know?
There are "faster" ones that are either already out this year or coming out sometime this year I don’t follow that attentively as I don't plan on buying. However, it won’t have any of the custom hardware around the SSD that’s going to effectively enable you get more data without sacrificing other resources (or actually having an even faster SSD) and a bunch of other components that are aimed to reduce other bottlenecks and reduce CPU/GPU usage in relation to getting data into memory or keeping relevant data on the GPU. So you are basically going to need extra compute power to compensate for any work the CPU/GPU and/or buy a SSD that much faster you don't need to worry about the work eliminated from the dedicated hardware.
Most existing games are already designed around not being able to rely on having fast access to a shit ton of data (e.g. blocked off areas, no back-tracking, cutscenes, lifting/climbing sequences, etc.), so you probably aren't going to see much improvement in old games for the metrics you mentioned. You might see small negligible improvements as a faster SSD can help reduce CPU/GPU for workloads requiring data from secondary storage (which would rare for old games because they just cache everything in RAM ahead of time because they have more of a just-in-case strategy). But for future new game, depending on the exact workloads and how it's designed you should probably see improvements as both Microsoft and PlayStation are expecting developers to have more of a "just-in-time" strategy to memory usage.
So to answer your question you'd need an SSD twice as fast probably (don't know which ones will be available) to offload
some work off your GPU/CPU and get the same effective speeds but you probably won't get the same targets with your crappy everything else,
closer on
future games for sure. You can't get any of the other components that come with the PS5 SSD that Epic and everyone praises that let you use your existing crappy GPU and CPU more effectively for future games. So having a crappier CPU/GPU than a PS5 while not being able to be as efficient will not let you match it with getting an SSD alone.
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There is a difference between saying a few nice things about the PS5 and going on a world press tour for Sony and ignore the other platforms outright refusing to acknowledge them at times. A 3rd party engine maker does not do that out of the kindness of their hearts. You can admit that it was fishy and now it makes sense. Then add in the custom IO rewrite Sony got and other optimizations. If it walks like a duck and quacks like a duck it probably is a duck.
They had one event. It's already been established that PlayStation wanted Epic to help them demo their engine using the PS5. Which isn't crazy Microsoft, Apple and others have done the same thing with Epic when showing off new things. They aren't going to talk about the Xbox during their PS5 event. That'd be like them talking about Apple when going on the Microsoft stage or talking about Google when they go on the Apple stage. A 3rd party engine maker who has a nerd as the CEO who likes to talk about tech and be vocal about what he thinks is cool or doesn't like. Nothing new. John Carmack who was also basically a 3rd party-engine developer used to praise the 360 all the time. Because he's a nerd and likes talking about tech that's interesting. Gabe Newell also liked to praise and also throw shade at the 360. Epic and Crytek use to love to praise the cell on the PS3. Crytek even praised DX 11 on Xbox One. Technical people or nerds like to talk about and excited by cool tech and the PS5 SSD is cool tech.
Why wouldn't they write custom things to take advantage of the platform their engine is going to support? Epic does custom things for Apple devices and is likely going to do custom things for Xbox as well if it's needed. They have an interest in making sure their engine works the best that it can on every platform. Not worry about if they are spending too much time on one platform or another. And if they do spend extra time on the PS5 it's arguably more likely because it shakes things up more and is the more popular platform. They wouldn't need to do anything special for having a CPU that's a bit faster, having RAM that's a bit faster or having extra GPU power. Because that shits expected and doesn't warrant special optimizations because it's nothing special/new about it. Not much different from a high-end PC that they already support.