WYP
News Guru
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SK Hynix starts Sampling 96-layer 4D QLC NAND
- Thread starter WYP
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NeverBackDown
AMD Enthusiast
Doesn't last as long though. My only concern.
WYP
News Guru
The same things were said about TLC once upon a time. A lot of this will be mitigated with smart controllers and newer NAND.
I'm trying to think of the last time I heard somebody say they had an SSD fail on this forum. That said, it will be interesting to see what the failure rates are on new QLC drives.
NeverBackDown
AMD Enthusiast
Well TLC wasn't much different in terms of longevity with MLC. QLC though is kinda halfing it. Which is a big difference.
The node size has increased with 3D NAND though so it's generally a net improvement in reliability with modern QLC. You gain more from moving to QLC and reverting/increasing node size than you do from shrinking nodes further/sticking with sub-20nm nodes and sticking with TLC. Node shrinks are the real killer with reliability.
halving it from TLC to QLC you mean?
well im not sure if that is right.
i read TLC (3D) has a lifetime of around 3000 cyles, QLC 1000 cycles (averaged).
but QLC drives should be bigger than most MLC or TLC drives.
so each cell should be used less or equal to smaller MLC/TLC drives.
i still have an intel Intel X25-M (MLC) from 2008 that runs fine.
it´s still used for caching in one of my systems.
for it´s 80GB size it has a lot of writes to handle.
so a 1GB QLC may has 10x less P/E cyles but 12.5 x more cells.
and i read QLC drives use beefier hardware, better write strategies to counter the wear.
if QLC lasts only 1/2 or 1/3 of the time (given that my MLC may work for another 4-5 years) im still fine with that.
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