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1) is the actual NAND flash faster, or are we talking about going from "awesome" to "abysmal" as soon as you run out of DRAM/SLC caches or what have you? Which,
by WesolyKubeczek 5y ago
1) is the actual NAND flash faster, or are we talking about going from "awesome" to "abysmal" as soon as you run out of DRAM/SLC caches or what have you? Which, given this kind of bandwidth, is going to be sooner rather than later.
2) this plus QLC cells, which, durability-wise, make TLC look good, makes me anticipate headlines like "This new PCIe 5.0 SSD ran out of its rated TBW in a week!"
- wtallis 5y agoThese controllers are for enterprise drives where SLC caching is almost unheard of and all the performance specs are for sustained performance on a full drive. But the best performance may only be attainable on a drive with higher capacity than you can afford.
- derefr 5y ago> Which, given this kind of bandwidth, is going to be sooner rather than later. I don't see why — like NAND up until now, it keeps up by adding more separately-addressable chips to the board and striping writes across them. A 512GB SSD with this chip would hit the wall pretty soon, but they wouldn't waste this controller on a 512GB SSD. They'd use it for 16TB+ SSDs.
- vbezhenar 5y ago> "This new PCIe 5.0 SSD ran out of its rated TBW in a week!" If this drive supports claimed 9 GB/s write speed, you can write 324 TB at 10 hours. Samsung QLC warranty for 1 TB drive is 360 TBW.
- wtallis 5y ago1 TB of QLC can't get anywhere close to 9 GB/s write speed. The best is currently about 40 MB/s for a 1 Tbit die, so 320 MB/s for 1 TByte. The slow write speed of QLC generally prevents you from burning out a drive in less than a few weeks.
- NullPrefix 5y agoChia is a godsend for storage prosumers. All you have to do is look at the speed and check if the warranty is voided by Chia.
- surajrmal 5y agoIOPS/GB of nand isn't really improving much, so you need more nand to hit these speeds.