4 ms·
> NVME is around two orders of magnitude slower than DDR3 RAM, No. Dual channel DDR3 went up to about 18 GB/s read and 14 GB/s write. [1] The latest NVMe PCIe
by phonon 4y ago
> NVME is around two orders of magnitude slower than DDR3 RAM,
No. Dual channel DDR3 went up to about 18 GB/s read and 14 GB/s write. [1]
The latest NVMe PCIe 5.0 SSD are about 13 GB/s read and 12 GB/s write. [2]
Apple SSD are about half that now, but most DDR3 users didn't have highest clocked dual channel RAM either. So roughly a factor of 2 or so at best, about a 50x difference compared to two orders of magnitude :-)
[1] https://www.anandtech.com/show/2792/5 https://www.anandtech.com/show/2792/5
[2] https://www.tweaktown.com/news/86395/apacer-is-first-with-pcie-5-0-ssds-up-to-13-000mb-sec-reads/index.html https://www.tweaktown.com/news/86395/apacer-is-first-with-pc...
- pxmpxm 4y agoOoooh good point - haven't actually heard of newest NVME stuff before. The M1/M2 apple hardware specifically seems to be around an order of magnitude from what I've seen (ddr4x 60-70gb/sec vs 7gb/sec for the NVME or thereabouts). The obvious observation here is that the fab yields for high memory apple silicone must not be all that great, which is why they're mostly shipping 8 and 16gb versions.
- phonon 4y agoYou just switched from DDR3, to the latest (few laptops offering that) DDR4x. And even then it's barely one order of magnitude. You were wrong, it's ok...welcome to the SSD future :-)
- Panzer04 4y ago"only" an order of magnitude. Never mind comparing bleeding edge NVMe with (by now) decade-old DDR3, while the current bleeding edge DDR5 is now trickling out at 100GB/s+ pretty easily. Never mind DDR memory latencies of ~50ns, vs NVMe at 50uS+. Just because the user doesn't notice GUI problems doesn't mean it's not going to be a catastrophic bottleneck in any memory-intensive application.