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frontpagePatrickK5807 posted Nov 08, 2025 01:50 AM
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frontpagePatrickK5807 posted Nov 08, 2025 01:50 AM

Costco Members: 4TB Lexar NM790 PCIe Gen4 NVMe Internal Solid State Drive

+ Free Shipping

$220

$300

26% off
Costco Wholesale
39 Comments 17,969 Views
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Deal Details
Costco Wholesale has for their Members: 4TB Lexar NM790 PCIe Gen4 NVMe Internal SSD (LNM790X004T-RNNCU) on sale for $219.99. Shipping is free.

Thanks to Community Member PatrickK5807 for sharing this deal.

Product Details:
  • NAND: TLC
  • Read/Write Speeds: 7400/6500
  • Controller: Maxio MAP1602
  • Dram Cache: No (HMB)
  • Warranty: 5 Year Warranty
  • TBW: 3000TBW
  • M.2 2280 Form Factor
  • PCIe Gen 4 / NVMe 2.0 Interface
  • PlayStation 5 Compatible

Editor's Notes

Written by Nate650 | Staff
  • About this deal:
  • About this product:
    • Rated 4.8 out of 5 stars based on 10 Costco customer reviews.
  • About this store:
    • If you don't have a Costco Warehouse Membership, you can sign-up here.
  • Additional notes:
    • Please see the original post for additional details & give the wiki and additional forum comments a read for helpful discussion.

Original Post

Written by PatrickK5807
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for their Members: 4TB Lexar NM790 PCIe Gen4 NVMe Internal SSD (LNM790X004T-RNNCU) on sale for $219.99. Shipping is free.

Thanks to Community Member PatrickK5807 for sharing this deal.

Product Details:
  • NAND: TLC
  • Read/Write Speeds: 7400/6500
  • Controller: Maxio MAP1602
  • Dram Cache: No (HMB)
  • Warranty: 5 Year Warranty
  • TBW: 3000TBW
  • M.2 2280 Form Factor
  • PCIe Gen 4 / NVMe 2.0 Interface
  • PlayStation 5 Compatible

Editor's Notes

Written by Nate650 | Staff
  • About this deal:
  • About this product:
    • Rated 4.8 out of 5 stars based on 10 Costco customer reviews.
  • About this store:
    • If you don't have a Costco Warehouse Membership, you can sign-up here.
  • Additional notes:
    • Please see the original post for additional details & give the wiki and additional forum comments a read for helpful discussion.

Original Post

Written by PatrickK5807

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Top Comments

LikeABadPenny
7139 Posts
2208 Reputation
DRAM-less.
chapoec
108 Posts
41 Reputation
this is the everyday price. if you missed the sale a few weeks ago at costco this one with the heatsink was $179.99
ilovetype
2134 Posts
1066 Reputation
the one that was on sale was the Lexar SE Play made just for costco, not the same as this model.

The Lexar SE Play is QLC uses InnoGrit's IG5236 controller, runs hot, but the price and heatsink and costco return policy negates that

This Lexar NM790 is TLC 3D NAND uses Maxio MAP1602 controller the price has been 219 since launch at Costco, and it's normally about ~$10~20 less than competitor.

---

For those shopping for NVME M.2, DDR5 ram, prices are not going to come down anytime soon. It's not just AI demand, cause large AI infra actually uses just as much HDD (spinning drives), tariffs and supply chain shifts and poor trade economy are the upstream causes.
(Also imagine all the people upgrading to NVME M2 (new mobo) and NVME being much faster than SATA SSD. )

https://viperatech.com/news-detai...%20in%20Q4.

https://www.tweaktown.com/news/10...index.html

38 Comments

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Nov 09, 2025 06:02 PM
90 Posts
Joined Mar 2012
RichyDingoNov 09, 2025 06:02 PM
90 Posts
So what does it take for the host to support HMB? I am looking for a SSD for my Minisforum MS-01 lab server where it will be all virtualised appliances and OSs - contacted Miniforum support and they said it doesn't support HMB, so am thinking HMB is more of a desktop PC type use case? Suspect for my case, I need a DRAM equipped SSD.

Cheers Dingo
Nov 09, 2025 06:12 PM
5,605 Posts
Joined Oct 2010
joshuaNHNov 09, 2025 06:12 PM
5,605 Posts
Quote from BlueFog7078 :
You may wonder why people are downvoting your comments. It is because the information you are parroting is misunderstood and outdated. Somewhere around 2019/2020 DRAM became less far less relevant for SSDs with the widespread adoption of Host Memory Buffer technology in NVMe SSD's. HMB allows DRAM-less SSD's to use a small portion of the computer's main RAM as a buffer, significantly improving their performance and making them competitive with DRAM-equipped drives for the vast majority of consumer applications,
Yes, you are correct. And the WesterDigital Black drives are DRAM less and are considered some of the best. But I still want DRAM and I don't want my harddrive to use my memory, like you suggest.

Also, the highest end models ususally have DRAM... for a reason.
3
Nov 09, 2025 07:52 PM
2,337 Posts
Joined Oct 2011
MWinkNov 09, 2025 07:52 PM
2,337 Posts
Quote from joshuaNH :
Yes, you are correct. And the WesterDigital Black drives are DRAM less and are considered some of the best. But I still want DRAM and I don't want my harddrive to use my memory, like you suggest.

Also, the highest end models ususally have DRAM... for a reason.
Some WD Black drives are DRAM-less. Models like the SN850X do have DRAM. The amount of system memory used for HMB is insignificant. It's usually only 32-64MB, so less than 1% in most cases. And yes, high end models usually have high end features. There's also a reason the majority of modern drives don't have DRAM, it's not all that consequential to the average user anymore.

Quote from RichyDingo :
So what does it take for the host to support HMB? I am looking for a SSD for my Minisforum MS-01 lab server where it will be all virtualised appliances and OSs - contacted Miniforum support and they said it doesn't support HMB, so am thinking HMB is more of a desktop PC type use case? Suspect for my case, I need a DRAM equipped SSD.

Cheers Dingo
The drive and OS need to support it. Virtually every modern DRAM-less NVMe drive supports it. Windows and Linux support it. The most notable cases where it's not supported are the PS5 and when the drive is connected via a USB bridge. It must be directly connected to the PCIe bus.

Quote from MrBojangels :
How is this any different than the host OS using ram to cache reads and writes? Not really a development
As someone else stated, DRAM/HMB isn't caching user data but the mapping table (FTL). Even if the OS tries to cache reads, it won't know what to cache with 100% accuracy. HMB was actually quite a significant development. It allowed substantially reduced manufacturing costs, while having a minimal impact on the performance of most workloads. It's actually quite impressive how well it worked out.

Quote from nosurprisespls :
The main difference is that OS is caching the files while the HMB is caching the lookup tables for the SSD's data blocks. HMB is probably around 10% slower on writes than equivalent SSDs with DRAM because of the slower updates to the lookup tables; likely no effects on reads.
DRAM has very little effect on writes. It primarily benefits small random reads, as the drive doesn't have to constantly look up different addresses on the copy of the table stored in NAND.
1
Nov 10, 2025 01:18 AM
25 Posts
Joined Oct 2015
JonBgood84Nov 10, 2025 01:18 AM
25 Posts
For what it's worth, I have two of these 4 TB SSDs in my gaming rig. At least for housing and playing my ever expanding Steam library, they work perfectly.
Nov 10, 2025 05:02 AM
51 Posts
Joined Sep 2013
VJ.TMXNov 10, 2025 05:02 AM
51 Posts
do you recommend this for Unifi Cloud Gateway Max?
Nov 10, 2025 05:03 AM
132 Posts
Joined Feb 2012
MiserMavenNov 10, 2025 05:03 AM
132 Posts
Quote from Golgatha :
I have the 8TB version of this drive and it's the only drive I've found that won't overheat in a basic USB 3.1 Gen2x2 enclosure. Also, it sips power, so I imagine it would be great for portables where battery life is needed. It would make an ideal PS5 upgrade drive too.
Where did you buy the 8 TB version?
Nov 10, 2025 05:50 AM
1,677 Posts
Joined Jan 2006
whodiiniNov 10, 2025 05:50 AM
1,677 Posts
Thanks for bringing this to my attention. At the same price, this seems better than the SN5000. I want a cheap 4TB or 8TB drive for media (music/movies) storage where it is write few, read many. So DRAMless doesnt matter than much other than the first time you fill the drive up. Even then, no one mentioned in this thread that it is TLC not QLC so once the pseudocache is used up, the native speed is still around 2200 MB/sec vs 500 MB/sec with QLC. I will wait until the price drops below 200 or the 8TB is available for 2x.

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Nov 10, 2025 05:04 PM
477 Posts
Joined Oct 2013
nosurprisesplsNov 10, 2025 05:04 PM
477 Posts
Quote from whodiini :
Thanks for bringing this to my attention. At the same price, this seems better than the SN5000. I want a cheap 4TB or 8TB drive for media (music/movies) storage where it is write few, read many. So DRAMless doesnt matter than much other than the first time you fill the drive up. Even then, no one mentioned in this thread that it is TLC not QLC so once the pseudocache is used up, the native speed is still around 2200 MB/sec vs 500 MB/sec with QLC. I will wait until the price drops below 200 or the 8TB is available for 2x.
From my experience, QLC will drop to 100 MBps, and TLC will drop to 500 MBps.
Nov 10, 2025 06:38 PM
2,337 Posts
Joined Oct 2011
MWinkNov 10, 2025 06:38 PM
2,337 Posts
Quote from nosurprisespls :
From my experience, QLC will drop to 100 MBps, and TLC will drop to 500 MBps.
It depends on a a variety of factors about the drive (flash channels, NAND type, etc.), as well as whether it's doing direct-to-TLC/QLC writes (when there's still some free space) or if it has to enter a folding state (when the NAND is completely full). Generally, the post-pSLC speeds tend to be in the ballpark of 100-500MB/s for QLC and 500MB/s-2GB/s for TLC.
Nov 10, 2025 07:40 PM
1,677 Posts
Joined Jan 2006
whodiiniNov 10, 2025 07:40 PM
1,677 Posts
Quote from nosurprisespls :
From my experience, QLC will drop to 100 MBps, and TLC will drop to 500 MBps.
It really depends on the exact type of flash used. My numbers were for specific drives, Lexar NM790 and WD SN5000, not generalized and tested by Tom's hardware.
Nov 10, 2025 09:06 PM
1,336 Posts
Joined Dec 2003
GolgathaNov 10, 2025 09:06 PM
1,336 Posts
Quote from MWink :
It depends on a a variety of factors about the drive (flash channels, NAND type, etc.), as well as whether it's doing direct-to-TLC/QLC writes (when there's still some free space) or if it has to enter a folding state (when the NAND is completely full). Generally, the post-pSLC speeds tend to be in the ballpark of 100-500MB/s for QLC and 500MB/s-2GB/s for TLC.
Seems pretty accurate. For my TLC 8TB NM790 drive, it settles in at a steady 1400-1500MB/s transferring a 3.5TB full drive backup file to it from a WD SN950X PCIe 4 drive in a M.2 slot.
Last edited by Golgatha November 10, 2025 at 02:08 PM.
Nov 10, 2025 09:06 PM
1,336 Posts
Joined Dec 2003
GolgathaNov 10, 2025 09:06 PM
1,336 Posts
Quote from MiserMaven :
Where did you buy the 8 TB version?
Micro Center
Nov 10, 2025 09:21 PM
1,336 Posts
Joined Dec 2003
GolgathaNov 10, 2025 09:21 PM
1,336 Posts
"DRAM has very little effect on writes. It primarily benefits small random reads, as the drive doesn't have to constantly look up different addresses on the copy of the table stored in NAND."

This is worth noting for gaming consoles, with the PS5 being the relevant one here since it's PCIe 4.0. For consoles that use 2.5in drives such as PS3 and PS4 (and modded PS2s), I only use drives with DRAM and they also need onboard garbage collection for best performance. Not a requirement, but I'm also really picky about drives for my PS3, since there's a soft 1TB limitation non-modded, so I typically get MLC drives like the 860 Pro to get the best TBW for longevity.
Last edited by Golgatha November 10, 2025 at 02:28 PM.
Nov 11, 2025 02:21 AM
477 Posts
Joined Oct 2013
nosurprisesplsNov 11, 2025 02:21 AM
477 Posts
Quote from Golgatha :
"DRAM has very little effect on writes. It primarily benefits small random reads, as the drive doesn't have to constantly look up different addresses on the copy of the table stored in NAND."

This is worth noting for gaming consoles, with the PS5 being the relevant one here since it's PCIe 4.0. For consoles that use 2.5in drives such as PS3 and PS4 (and modded PS2s), I only use drives with DRAM and they also need onboard garbage collection for best performance. Not a requirement, but I'm also really picky about drives for my PS3, since there's a soft 1TB limitation non-modded, so I typically get MLC drives like the 860 Pro to get the best TBW for longevity.
If an SSD doesn't have DRAM and doesn't support HMB like in the PS5, performance of random reads can drop 50%.

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Nov 11, 2025 10:49 AM
484 Posts
Joined Feb 2008
goldenroolNov 11, 2025 10:49 AM
484 Posts
Quote from LikeABadPenny :
....Remember the no HDMI days? ....
Ha! My thoughts exactly. I was just about to post:

But, it doesn't have HDMI !

Almost as insipid as "Is it compatible with PS5"?
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