this post was submitted on 31 Aug 2023
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I've got a better idea. You want to make your game stupidly large? Ok fine, sell me a physical copy pre-installed on a fast USB stick. Job done.
Read speeds from a USB stick are incomparably slower than most hard drives. The USB 3.0 specification has a theoretical maximum transfer rate of 5Gb/sec (~600MB/s). By comparison, my PCIe 4.0 NVMe (I believe most laptops these days come with NVMe storage? Could be wrong) has a read performance, reported by CrystalDiskMark, of 7.3GB/s (that's a big B, not a little b, and looking at 1MiB sequential 1 thread 8 queues). In other words, my hard drive's measured performance is 12x faster than the theoretical maximum throughput of a USB drive. This also doesn't take into account things like DirectStorage, which some games have started to adopt.
I think realistically games should consider separating the higher quality assets from the low quality assets intended for lower performance systems, and make them separate downloads. HD assets could be a free "DLC" on Steam, for example.
Than most Solid State Drives you mean, since Hard Drive Disks have way slower read speeds than USB 3.0/3.1, I even have proof, My partners BG3 game was laggy as hell in her hard drive, but it's manageable to play in an external SSD connected to USB3.1. The read speed changes from 35MB7s-ish to 500MB/s-ish iirc. it was VERY noticeable. Her laptop is a gaming laptop bought 4 years ago, and the processor/grapphics card works pretty well still, but the 250GB SSD is just not enough to manage windows and all the other games/programs, and the HHD is way too slow, so yeah. In the future changing the SSD to put a bigger one would be the best but for now an external drive works wonders.
USB 3.2 gen 2x2's theoretical speeds cap out at 20Gb/s (or 2.5GB/sec). It's certainly a performance improvement compared to USB 3.0, but still doesn't quite meet the performance of an internal NVMe. If your PC supports Thunderbolt, you get double the bandwidth (so 5GB/sec) which does match what some slower PCIe 4.0 NVMe drives can handle. This is of course assuming you're comparing to a NVMe, a SATA drive won't come close to these speeds but I believe most laptops these days use NVMe drives.
Regardless, if you're loading games off a USB 3.2 gen 2x2 interface, and assuming you're using a single drive to a single controller (keep in mind that performance is split between connected devices per controller, and PCs often only have a couple controllers at most to manage all the ports), your read performance is probably more than enough.
I said "Internal SSD" not NVME SSD. So some description fail on my part, I meant SATA SSD.
Ah, most laptops these days ship with an internal NVMe, so that's what I assumed you were comparing against. A USB 3.2 gen 2x2 enclosure will vastly outperform a SATA SSD I believe, again assuming it's the only device connected to your controller.