NAND makers reportedly struggle to improve QLC yields

Yield rates need to imporve before the NAND type can become a major force in the market

NAND makers reportedly struggle to improve QLC yields

NAND makers reportedly struggle to improve QLC yields

QLC NAND promises to deliver memory with increased levels of storage capacity per cell, offering a 33% increase in storage potential over today's TLC memory. Today, Samsung, Intel, Micron, Toshiba and Western Digital are all capable of manufacturing QLC memory, but sources from Digitimes have claimed that manufacturing yields are lower than expected, preventing the memory type from reaching the price points and manufacturing levels that are required to have a significant impact on the DRAM market. 

DigiTimes has reported that manufacturers are struggling to get their manufacturing yields to over 50%, which means that around half of the QLC NAND chips that are produced are non-functional or otherwise faulty. Increasing silicon yields is one of the ways that manufacturers can improve profitability, increasing their effective production rate (as more chip work), which increases their return on investment (getting more working chips from a single wafer means more profit).

Lower than expected manufacturing yields has led to an undersupply of QLC NAND, which has prevented most manufacturers from releasing QLC-powered SSDs. Beyond that, low manufacturing yields also make it possible that TLC NAND is more profitable to produce, giving QLC NAND no competitive value. 

If DigiTimes' information is correct, it means that it will take a while before QLC NAND becomes a commonplace within the storage market, as yields will no doubt improve over time.          

NAND makers reportedly struggle to improve QLC yields  

Over the past few months, NAND pricing has decreased significantly, lowering the cost of consumer SSDs. Most of today's consumer SSDs make use of TLC NAND, with increasing NAND supply forcing prices down, something which is great news for consumers. The introduction of QLC NAND can potentially lower SSD prices further, assuming that yields will eventually improve enough to make the NAND type more profitable than TLC, at least when it comes to usable storage per wafer. 

You can join the discussion on QLC's reportedly low yield rates on the OC3D Forums.  

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Most Recent Comments

04-10-2018, 18:56:07

Hey Mark(or anyone) do you know if it's possible that despite QLC being inherently slower, is it still able to reach speeds that modern NVMe drives can? Whether they are x4 or x2?
If they could it would be something I'd definitely want.Quote

04-10-2018, 19:17:26

My understanding was that QLC, MLC and SLC where only to do with density and didn't affect the bandwidth.
So SLC needs more physical packages to deliver the same level of storage but if it is being addressed by the same controller then speeds should be roughly the same.
I'm not sure however if latency increases.Quote

04-10-2018, 19:35:13

Maybe I just remembered wrong and the difference may only be longevity in terms of Nand endurance?Quote

05-10-2018, 00:20:24

SLC flash memory can withstand many more writes and erasures than MLC memory. This is to do with the density of information being stored on an SLC unit compared to an MLC one.

After some reading apparently SLC is faster tooQuote

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