expiredtDames | Staff posted Oct 07, 2025 06:02 PM
Item 1 of 4
Item 1 of 4
expiredtDames | Staff posted Oct 07, 2025 06:02 PM
Prime Members: 2TB Samsung 990 PRO PCIe Gen4 NVMe Solid State Drive
& More + Free S&H$134
$200
33% offAmazon
Visit AmazonGood Deal
Bad Deal
Save
Share
Leave a Comment
30 Comments
Sign up for a Slickdeals account to remove this ad.
Does it looks like mine has been tampered with?
Yes. That LPN barcode likely indicates that it was returned by someone else. When Amazon sent me a product like that (which was supposed to be new), it ended up just being an empty box.
While you are in the Samsung software I'd make sure to update the firmware just to be safe.
It ended back on the 8th.
Why it is still on the Frontpage days after reporting expired.
Me thinks the mods are more interested in milking the system for deals they post than Slickdeals being a functional site.
990 Pro >>>>>> SN850X
990 Pro: 176-layer NAND made by Samsung.
SN850X: 112-layer NAND made by Kioxia.
176 layers represent about 57% more layers than 112-layer NAND, leading to significantly higher storage per chip and better cost efficiency.
112-layer NAND: 2019ā2020
176-layer NAND: 2021ā2022
2 years ahead.
Moving from 112L to 176L is not just a linear improvement ā it's a full generational shift.
Comparable to a jump like DDR4 ā DDR5 in DRAM.
Leading companies (Samsung, SK Hynix, Micron) have already moved toward 200+ layers.
Meanwhile, some latecomers (e.g., YMTC or some smaller foundries) are still focused on 112L or 128L.
990 Pro >>>>>> SN850X<br />
<br />
990 Pro: 176-layer NAND made by Samsung.<br />
<br />
SN850X: 112-layer NAND made by Kioxia.<br />
<br />
176 layers represent about 57% more layers than 112-layer NAND, leading to significantly higher storage per chip and better cost efficiency.<br />
<br />
112-layer NAND: 2019ā2020<br />
176-layer NAND: 2021ā2022<br />
2 years ahead.<br />
<br />
Moving from 112L to 176L is not just a linear improvement ā it's a full generational shift.<br />
Comparable to a jump like DDR4 ā DDR5 in DRAM.<br />
Leading companies (Samsung, SK Hynix, Micron) have already moved toward 200+ layers.<br />
Meanwhile, some latecomers (e.g., YMTC or some smaller foundries) are still focused on 112L or 128L.
I'm not sure where you're getting your information about YMTC. I believe they were the first to release 200+ layer NAND, beating even the likes of Samsung, Micron, etc. Drives using 232L YMTC TLC and the Maxio MAP1602 have been extremely popular for the last few years. They usually have great performance for the price.
Sign up for a Slickdeals account to remove this ad.
<br />
In general, the 990 Pro and SN850X trade blows and there's not much meaningful difference between them (other than the higher capacity WDs potentially being double-sided). The exact NAND used can vary. It also doesn't necessarily make a huge practical difference. Both of these drives are top-tier consumer Gen4 drives. <br />
<br />
I'm not sure where you're getting your information about YMTC. I believe they were the first to release 200+ layer NAND, beating even the likes of Samsung, Micron, etc. Drives using 232L YMTC TLC and the Maxio MAP1602 have been extremely popular for the last few years. They usually have great performance for the price.
WD (SanDisk) doesn't have top-tier technology like Samsung or SK Hynix, so they can't stack as many layers.
https://www.tomshardwar
https://www.tomshardwar
https://www.pcmag.com/reviews/wd-black-sn850x
[ATTACH]18488656[/ATTACH]
[ATTACH]18488632[/ATTACH]
[ATTACH]18488635[/ATTACH]
[ATTACH]18488638[/ATTACH]
[ATTACH]18488641[/ATTACH]
[ATTACH]18488644[/ATTACH]
[ATTACH]18488647[/ATTACH]
[ATTACH]18488650[/ATTACH]
Samsung vs WD/SanDisk ā Latest NAND Technology Comparison (2025)
[ATTACH]18488665[/ATTACH]
Summary and Interpretation of Technical Differences
Here are the key technical differences between the latest NAND technologies used by Samsung and WD/SanDisk:
1. Layer Count and Vertical Density
Samsung has reportedly reached around 290 layers with its 9th-gen V-NAND and is aiming for 400+ layers in future generations.
WD/SanDisk (via BiCS8) currently achieves around 218 layers, with BiCS9 in development targeting over 300 layers.
ā As of now, Samsung appears to lead in terms of layer count and vertical scaling capability.
2. Stacking Architecture
Samsung uses a dual-stack architecture, which helps manage high layer counts with better channel hole etching.
WD/SanDisk traditionally uses single-stack (or limited dual-stack) structures, gradually scaling layer count.
3. Wafer Bonding / Advanced Packaging
Samsung is preparing to adopt wafer bonding technologies for future NAND (starting with 10th-gen) to overcome limitations of ultra-high stacks.
WD/SanDisk is also exploring advanced packaging techniques like CBA (Circuit Bonded Array), especially for BiCS9 and beyond.
4, Interface Speed and Power Efficiency
Samsung's latest V-NAND supports Toggle DDR 5.x, enabling transfer rates up to 3,600 MT/s, with power-saving features.
WD/SanDisk emphasizes energy efficiency and is developing faster I/O interfaces for future BiCS generations (BiCS9 and above).
5. Yield and Manufacturing Complexity
As layer counts increase, manufacturing becomes more complex, with lower yield and higher defect risk.
Samsung addresses this with advanced channel hole etching and bonding technologies, while WD/SanDisk focuses on cost-effective scaling with stable manufacturing processes.
It ended back on the 8th.
Why it is still on the Frontpage days after reporting expired.
Me thinks the mods are more interested in milking the system for deals they post than Slickdeals being a functional site.
<br />
What are you talking about? I have both of them. 990 Pro is better for every thing.<br />
WD (SanDisk) doesn't have top-tier technology like Samsung or SK Hynix, so they can't stack as many layers.<br />
<br />
https://www.tomshardwar
<br />
https://www.tomshardwar
<br />
https://www.pcmag.com/reviews/wd-black-sn850x<br />
<br />
<br />
<br />
[ATTACH]18488656[/ATTACH]<br />
<br />
[ATTACH]18488632[/ATTACH]<br />
<br />
[ATTACH]18488635[/ATTACH]<br />
<br />
[ATTACH]18488638[/ATTACH]<br />
<br />
[ATTACH]18488641[/ATTACH]<br />
<br />
[ATTACH]18488644[/ATTACH]<br />
<br />
[ATTACH]18488647[/ATTACH]<br />
<br />
[ATTACH]18488650[/ATTACH]<br />
<br />
Samsung vs WD/SanDisk ā Latest NAND Technology Comparison (2025)<br />
<br />
[ATTACH]18488665[/ATTACH]<br />
<br />
Summary and Interpretation of Technical Differences<br />
<br />
Here are the key technical differences between the latest NAND technologies used by Samsung and WD/SanDisk:<br />
<br />
1. Layer Count and Vertical Density<br />
<br />
Samsung has reportedly reached around 290 layers with its 9th-gen V-NAND and is aiming for 400+ layers in future generations.<br />
<br />
WD/SanDisk (via BiCS8) currently achieves around 218 layers, with BiCS9 in development targeting over 300 layers.<br />
ā As of now, Samsung appears to lead in terms of layer count and vertical scaling capability.<br />
<br />
2. Stacking Architecture<br />
<br />
Samsung uses a dual-stack architecture, which helps manage high layer counts with better channel hole etching.<br />
<br />
WD/SanDisk traditionally uses single-stack (or limited dual-stack) structures, gradually scaling layer count.<br />
<br />
3. Wafer Bonding / Advanced Packaging<br />
<br />
Samsung is preparing to adopt wafer bonding technologies for future NAND (starting with 10th-gen) to overcome limitations of ultra-high stacks.<br />
<br />
WD/SanDisk is also exploring advanced packaging techniques like CBA (Circuit Bonded Array), especially for BiCS9 and beyond.<br />
<br />
4, Interface Speed and Power Efficiency<br />
<br />
Samsung's latest V-NAND supports Toggle DDR 5.x, enabling transfer rates up to 3,600 MT/s, with power-saving features.<br />
<br />
WD/SanDisk emphasizes energy efficiency and is developing faster I/O interfaces for future BiCS generations (BiCS9 and above).<br />
<br />
5. Yield and Manufacturing Complexity<br />
<br />
As layer counts increase, manufacturing becomes more complex, with lower yield and higher defect risk.<br />
<br />
Samsung addresses this with advanced channel hole etching and bonding technologies, while WD/SanDisk focuses on cost-effective scaling with stable manufacturing processes.
<br />
This looks like it was written by AI. Having more layers doesn't inherently mean that NAND is better. Both of the drives in question are excellent.
Always better.
1. Better Power Efficiency.
2. Better performance.
EVERY SINGLE THING IS BETTER.
You know nothing about it.
With so many papers, proofs, and established results, who's going to believe you if you're the only one denying them? Just like I brought evidence, you should too. You believe what you believe . BUT you can never bring any evidence. Because what you believe simply doesn't exist.
https://www.tomshardwar
https://www.tomshardwar
https://news.samsung.co
https://www.mdpi.com/2079-9292/10/24/3156
https://www.mdpi.com/2076-3417/14/15/6689
Kidding me?
Always better.<br />
1. Better Power Efficiency.<br />
2. Better performance.<br />
EVERY SINGLE THING IS BETTER.<br />
You know nothing about it.<br />
With so many papers, proofs, and established results, who's going to believe you if you're the only one denying them? Just like I brought evidence, you should too. You believe what you believe . BUT you can never bring any evidence. Because what you believe simply doesn't exist.<br />
<br />
https://www.tomshardwar
<br />
https://www.tomshardwar
<br />
https://news.samsung.co
<br />
https://www.mdpi.com/2079-9292/10/24/3156<br />
<br />
https://www.mdpi.com/2076-3417/14/15/6689
<br />
Passing off marketing material as "proof" is hardly convincing. Newer isn't always better. Just ask the people who were buying the newer Samsung drives a few years ago, only to have them drop like flies.
Marketing Marketing Marketing Marketing Marketing....Then I guess all those papers I linked are just marketing too, huh? There are tens of millions of papers on NAND layers, you know.
Let me give you a piece of advice. If you talk without any evidence or facts, no one will believe you. <br />
Marketing Marketing Marketing Marketing Marketing....Then I guess all those papers I linked are just marketing too, huh? There are tens of millions of papers on NAND layers, you know.<br />
Sign up for a Slickdeals account to remove this ad.
<br />
You claimed the 990 Pro is vastly superior to the SN850X, then you (or your AI) cherry picked some benchmarks to support your claim. Even the review for the 990 Pro states:<br />
<br />
<br />
<br />
They're both great drives, but you latched solely onto the fact that the NAND on the 990 Pro may have more layers. Even in the papers you linked, I don't see where they assert that more layers is always better, as you claimed.
Leave a Comment