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>DDR5 provides both data and clock rates that double the performance up to at least 7,200 MB/s. Additionally, DDR5 lowers the operating voltage to 1.1V. hmm? 7
by tester756 5y ago
>DDR5 provides both data and clock rates that double the performance up to at least 7,200 MB/s. Additionally, DDR5 lowers the operating voltage to 1.1V.
hmm? 7GB/s is the performance that modern disks achieve
edit. nvm: When it comes to bandwidth, DIMMs provide 38.4 GB/s or 44.8GB/s
I do wonder when disks will be close to RAM sticks because gap seems to be closing.
It'd be nice to do not have to buy RAM sticks and just use small 1TB NVMe M2 disk as both - ram and disk
- ziml77 5y agoBandwidth isn’t the only constraint. You also have latency, finite write cycles, a minimum number of bytes that need to be rewritten at once. Also SSDs get those speeds by having onboard DRAM caches. That may not be the speed of the flash memory
- wtallis 5y ago> Also SSDs get those speeds by having onboard DRAM caches. Usually not. Most SSDs that have DRAM only use it to hold the address mapping tables, not any user data. The DRAM cache for that internal metadata helps with random IO performance (saving an extra flash read before the real IO can be done), but has minimal impact on sequential read throughput, which is what has actually reached 7+ GB/s.