What To Expect From Next-gen Games

NVMe SSDs can easily be 50 times faster than hard drives for sequential reads and thousands of times faster for random reads. It stands to reason that game developers should be able to do things differently when they no longer need to target slow hard drives and can rely on fast storage. Workarounds for slow hard drive performance can be discarded, and new ideas and features that would never work on hard drives can be tried out. Microsoft and Sony are in pretty close agreement about what this will mean for the upcoming console generation, and they've touted most of the same benefits for end users.

Most of the game design changes enabled by abandoning hard drives will have little impact on the gaming experience from one second to the next; removing workarounds for slow storage won't do much to help frames per second, but it will remove some other pain points in the overall console experience. For starters, solid state drives can tolerate a high degree of fragmentation with no noticeable performance impact, so game files don't need to be defragmented after updates. Defragmentation is something most PC users no longer need to give even a passing thought, but it's still an occasionally necessary (albeit automatic) maintenance process on current consoles.


Not as obsolete as you might have thought. But soon.

Since game developers no longer need to care so much about maintaining spatial locality of data on disk, it will also no longer be necessary for data that's reused in several parts of a game to be duplicated on several parts of the disk. Commonly re-used sounds, textures and models will only need to be included once in a game's files. This will have at least a tiny effect on slowing the growth of game install sizes, but it probably won't actually reverse that trend except where a studio has been greatly abusing the copy and paste features in their level editors.


Clone tool abuse

Warnings to not turn off the console while a game is saving first showed up when consoles moved away from cartridges with built-in solid state storage, and those warnings continue to be a hallmark of many console games and half-assed PC ports. The write speeds of SSDs are fast enough that saving a game takes much less time than reaching for a power switch, so ideally those warnings should be reduced, if not gone for good.


How to spot a console port

But NVMe SSDs have write speeds that go far beyond even that requirement, and that allows changes in how games are saved. Instead of summarizing the player's progress in a file that is mere megabytes, new consoles will have the freedom to dump gigabytes of data to disk. All of the RAM used by a game can be saved to a NVMe SSD in a matter of seconds, like the save state features common to console emulators. If the static assets (textures, sounds, etc.) that are unmodified are excluded from the save file, we're back down to near instant save operations. But now the save file and in-use game assets can be simply read back into RAM to resume the whole game state in no more than a second or two, bypassing all the usual start-up and load work done by games.


Xbox Series X Quick Resume menu

The deduplication of game assets is a benefit that will trivially carry over to PC ports, and the lack of defragmentation is something PC gamers with SSDs have already been enjoying for years—and neither of those changes requires a cutting edge SSD. The instant save and resume capabilities can work just fine (albeit not quite so "instant") on even a SATA SSD, but implementing this well requires a bit of help from the operating system, so it may be a while before this feature becomes commonplace on PC games. (Desktop operating systems have long supported hibernate and restore of the entire OS image, but doing it per-application is unusual.)

But those are all pretty much convenience features that do not make the core game experience itself any richer. The reduction or elimination of loading screens be a welcome improvement for many games—but many more games have already gone to great lengths to eliminate loading screens as much as possible. This most often takes the form of level design that obscures what would have been a loading screen. The player's movement and field of view are temporarily constrained, drastically reducing the assets that need to stay in RAM and allowing everything else to be swapped out, while retaining some illusion of player freedom. Narrow hallways and canyons, elevator and train rides, and airlocks—frequently one-way trips—are all standard game design elements to make it less obvious where a game world is divided.


Level design for 64MB of RAM

Open-world games get by with fewer such design elements by making the world less detailed and restricting player movement speed so that no matter where the player chooses to move, the necessary assets can be streamed into RAM on the fly. With a fast SSD, game designers and players will both have more freedom. But some transition sequences will still be required for major scene changes. The consoles cannot reload the entire contents of RAM from one frame to the next; that will still take several seconds.

SSD As RAM?

Finally, we come to what may be the most significant consequence of making SSDs standard and required for games, but is also the most overstated benefit: Both Microsoft and Sony have made statements along the lines of saying that the SSD can be used almost like RAM. Whatever qualifiers and caveats those statement came with quickly get dropped by fans and even some press. So let's be clear here: the console SSDs are no substitute for RAM. The PS5's SSD can supply data at 5.5 GB/s. The RAM runs at 448 GB/s, *81 times faster*. The consoles have 16 GB of GDDR6 memory. If a game needs to use more than 16 GB to render a scene, framerates will drop down to Myst levels because the SSD is not fast enough. The SSDs are inadequate in both throughput and latency.

It's certainly possible for a level to use more than 16GB of assets, but not all on screen at once. The technical term here is working set: how much memory is really being actively used at once. What the SSD changes somewhat is the threshold for what can be considered active. With a fast SSD, the assets that need to be kept in DRAM aren't much more than what's currently on screen, and the game doesn't need to prefetch very far ahead. Textures for an object in the same room but currently off-screen may be safe to leave on disk until the camera starts moving in that direction, whereas a hard drive based system will probably need to keep assets for the entire room and adjacent rooms in RAM to avoid stuttering. This difference means an SSD-based console (especially with NVMe performance) can free up some VRAM and allow for some higher-resolution assets. It's not a huge change; it's not like the SSD increases effective VRAM size by tens of GBs, but it is very plausible that it allows games to use an extra few GB of RAM for on-screen content rather than prefetching off-screen assets. Mark Cerny has approximated it as saying the game now only needs to pre-fetch about a second ahead, rather than about 30 seconds ahead.


(Not to scale)

There's another layer to this benefit: partially resident textures has been possible on other platforms, but becomes more powerful now. What was originally developed for multi-acre ground textures can now be effectively used on much smaller objects. Sampler feedback allows the GPU to provide the application with more detailed and accurate information about which portions of a texture are actually being displayed. The game can use that information to only issue SSD read requests for those portions of the file. This can be done with a granularity of 128kB blocks of the (uncompressed) texture, which is small enough to allow for meaningful RAM savings by not loading texels that won't be used, while at the same time still issuing SSD reads that are large enough to be a good fit for SSD performance characteristics.

Microsoft has stated that these capabilities add up to the effect of a 2x or 3x multiplier of RAM capacity and SSD bandwidth. I'm not convinced. Sure, a lot of SSD bandwidth can be saved over short timescales by incrementally loading a scene. But I doubt these features will allow the Series X with its ~10GB of VRAM to handle the kind of detailed scenery you could draw on a PC GPU with 24GB of VRAM. They're welcome to prove me wrong, though.

Balancing the System: Other Hardware Features What's Necessary to Get Full Performance Out of a Solid State Drive?
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  • PopinFRESH007 - Tuesday, June 16, 2020 - link

    You could use GeForce Experience which does all of that for you if you don’t want to configure settings yourself. Assuming you have an nVidia GPU Reply
  • Gastec - Sunday, January 3, 2021 - link

    "I can't be bothered!", the statement of a generation. Reply
  • Zingam - Saturday, June 13, 2020 - link

    If they dip down to 30fps - that's intended. Blame your game developer. I used to be one. Reply
  • Kangal - Saturday, June 13, 2020 - link

    True.
    Although we've made a lot of progress in the console hardware:

    Small Capacity Cartridges > Much Larger CD > Much Faster DVD > Larger BluRay > Much Larger HDD > Much Faster SSD

    For example: SNES > PS1 > PS2 > PS3 > PS4 > PS5
    Reply
  • arslan0123 - Friday, June 26, 2020 - link

    look how good ps4 pro graphics are cuz games are optimized for 1 same hardware that millions owned. on PC there are lots of problems. u have to fix yourself. too much time consuming. on ps4 pro i dont have to care Reply
  • Sivar - Friday, June 12, 2020 - link

    Consoles are definitely easier to start with, but PCs have come a long way and still have "the PC advantages". You can buy any mid-range gaming PC or build one (if you like that kind of thing, as I do) with a mid-range nVidia card, mid-range CPU, etc. and install Steam and games generally "just work". nVidia provides software to automatically adjust game settings for your hardware.
    Load times, graphics quality, and controller quality are all superior on the PC, though new consoles generally take a brief lead before the multi-year period where PCs catch up and surpass them.
    For me, the mouse and keyboard alone will keep me on PC for the foreseeable future. The PC's game quality advantage is diminishing over time, but my types of games (RPGs with plots and characters, Warframe, and a few others) are still PC-centric.
    Reply
  • Zingam - Saturday, June 13, 2020 - link

    Mouse and keyboard, gamepads, light guns, VR, touch... are meant for completely different game types and experience. Mixing them is stupid. You don't play basketball with a golf ball as well you don't play golf with a football. Reply
  • close - Sunday, June 14, 2020 - link

    @Sivar: Of course PCs have advantages. From being potentially far more powerful than any console on the market, to easily being upgraded, and giving far more flexibility in the balance of performance and quality you can get. That's not really debatable.

    But the "just works and it's consistent and hassle free" will never come to the PC. The exact same arguments from above make sure of that. Consoles are uniform and it's much easier to make a game that plays just well enough on exactly that. You'd be hard pressed to find 2 identical PCs around. So if you really can't be bothered with that you'll give up on the advantages above to have something that for lack of a better description "just works".

    As an (offensive) analogy that the current gen of AT commenters will probably easily relate to, the PC is that hot Tinder date you have tonight. You always get the "latest model" and as long as you're willing to jump through some hoops and deal with some hassle you may get what you were looking for. Or maybe (s)he will just piss you off and leave you hanging. The console is your long term partner, not the best at everything, you can't just replace the parts you'd like changed but always there for you consistently delivering. And you love them for that. :)
    Reply
  • khanikun - Sunday, June 14, 2020 - link

    "But the "just works and it's consistent and hassle free" will never come to the PC"

    Except that it does, for some people. I just install the game and use whatever default it has and good to go. Maybe cause I'm not one of the ppl who are constantly grabbing the latest GPU drivers. I pretty much install the gpu with whatever the latest drivers were from that time and don't bother with updating it again.

    If you're the type that needs the latest chipset drivers, latest gpu drivers, latest firmware, etc. That way you can grab every ounce of performance out of the system or get the latest optimizations for X game, then Ya. You'll probably run into some kind of issues.

    If you get your machine running and don't bother with it again, you'll more than likely not run into any issues, except when you actually have a physical hardware fault. That or the game is just a piss poor port. Like the last Batman game.

    Me, I just game on both consoles and PC, cause I'm a gamer. Doesn't need to be one or the other.

    Also, I'll disagree with "You'd be hard pressed to find 2 identical PCs around". Are you completely forgetting OEM builds? You won't be hard pressed to find 2 identical PCs around. I bet you could find 1000 identical PCs around.
    Reply
  • shelbystripes - Friday, June 12, 2020 - link

    Your “penis measuring” mark makes me think you’re missing the point here. It’s true, there is a bunch of pointless fanboy-arguing between brand fans on each new generation about which is best. But this is AnandTech, and people come here to read articles about hardware, and HOW and WHY games on consoles are able to not only “just work as intended” but deliver impressive performance through incredibly thoughtful optimizations. What makes a GOOD console is that the final product “just works” but it’s still worth reading (for a lot of people) about the technology console makers are using to try to make that happen.

    This is especially true for the Xbox, where features being developed may influence PC gaming or Windows generally. The new Xbox storage API is going to make its way to Windows, and will be a much-needed improvement that could help more than just games.

    If you DGAF what’s inside a box, why are you on this site?
    Reply

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