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ADATA Ultimate SU800 3D NAND 2.5" SATA III SSD: 2TB $183, 1TB $90, 512GB EXPIRED

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ADATA via Rakuten has select ADATA Ultimate SU800 3D NAND 2.5" SATA III Solid State Drives on sale listed below when you apply the corresponding coupon code. Shipping is free. Thanks delz4stelz

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Each includes 3-year warranty. Offer valid through 4/24 while supplies last. -johnny_miller

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Edited April 19, 2019 at 06:27 PM by
ADATA via Rakuten

ADATA Ultimate SU800 3D NAND 2.5" SATA III Solid State Drive (SSD)

512GB [rakuten.com] 49.29 w/ code AD8
1TB [rakuten.com] $90.09 w/ code AD15
2TB [rakuten.com] $182.74 w/ code AD32
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How often do you do sustained large writes? Most people don't, and all SSD drives at this capacity & price point have that same behavior.

To clarify: The SLC and DRAM caches are two different beasts. DRAM, which is important but not present on some cheaper models like the SU650, caches the drive index maps of where data is located. DRAM is much faster than SLC. The SLC is the data cache.

On the 256GB model the SU800 has an 8GB SLC cache. All current SSDs use either TLC (or QLC) NAND chips to achieve their high capacities, which means they are storing 3x or 4x the bits using multiple voltages on each cell. (MLC or 2x is disappearing from the marketplace now.)

SLC is fast, but each density layer makes writing data significantly slower. (Read speeds are less affected.) So most SSDs, including this one, have a SLC write cache of some size, and "fold" the data on from there into the slower layers. That's why drive speeds drop after the cache is filled. 3D and 4D NAND is slow, and the SSD controller dynamically manages the size of the SLC cache based on factors like how big and how empty the drive is. I don't have the data at hand on how much larger the cache is for the 512GB and up SU800 models advertised here, but they scale with size and I'd guess they range from 10 to 15GB.

I can report that recently I purchased a 1TB Crucial P1 QLC NVMe (NVMe is 2x or more as fast as SATA3). After 15GB the SLC cache filled up when restoring the system drive, and speeds dropped noticeably from 1500MB/s to about 100MB/s. (I chose the Crucial QLC drive because it was cheap and the old laptop I installed it was the real limiting factor on transfer speed.)

But I probably won't ever write 15GB consecutively again. Slowing down on sustained writes is no big deal for me as a consumer. It's just how consumer SSDs work right now, given the tradeoffs between SSD controllers, interface, DRAM & SLC caches, density, total capacity, and price. Be an informed buyer.

You can, however, spend a small fortune on a high capacity, enterprise-grade SSD, like those used in servers. But the current models are now NVMe only and be prepared to cool them. They are not consumer-grade beasts, though you can find a couple of high end performance, expensive consumer-grade models geared at the film and video editing industry.

This is a fine deal for what it is--an older SSD form factor and interface. The SU800 is one of the fastest SATA SSDs on UserBench, which measures speeds on a wide variety of systems in the real world--as opposed to the all-new latest and greatest systems used by testing sites.

As to its competitors: The Crucial MX500 is barely any faster than this drive, and only because it uses a slightly newer generation of 3D NAND. Samsung 860 EVO (TLC) is about only 10% faster but costs ~50% more. The MX300 is slower. Yes, a few other 2.5" SATA SSD models have higher prices and better sustained write speeds--eg Samsung 860 PRO (MLC) for $300. But this is a good deal for most consumers who want a high capacity 2.5" SATA SSD.
21 Helpful?
Whoa for real! Super odd. The only way to get to the Rakuten store from their home page is to click All Stores> Shop Our Store. If I was new to Rakuten, I wouldn't have known that they sell things themselves. Their homepage is just LITTERED with cash back crap.

Alright i'm reading on Wikipedia that erbates is now a subsidiary of Rakuten.



Looking at wayback machine, it seems Rakuten assimilated erbates onto their homepage in October 2018.

Edit: grow up Slickdeals. They block the name of erbates
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Joined Dec 2011
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#3
Thoughts? I bought an NVMe drive, but need an SATA SSD for the main bay.
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#4
No I'd pass. The cache is like 8GB and once that's filled up the write speed slows down to like 50MB per second on the 256GB model.
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#5
Quote from sounreal
:
No I'd pass. The cache is like 8GB and once that's filled up the write speed slows down to like 50MB per second on the 256GB model.
How about the 2TB model?
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#6
Quote from TheDudefromLA
:
How about the 2TB model?
I don't know. But but I would hope not.
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#7
Their 500GB NVMe drive needs to be $50. That would be a great deal
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#8
ADATA via Rakuten.com [rakuten.com] has a ADATA SU800 1TB SSD for $90.09. Use code AD15.
  • Must be logged in your Rakuten account to apply promo code.
Also Available:
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#9
Is this site reliable?
I rember them in the past but they seem to have disappeared
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#10
Keep plumbing. 😉
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#11
Quote from sounreal
:
No I'd pass. The cache is like 8GB and once that's filled up the write speed slows down to like 50MB per second on the 256GB model.
Doesn't this have dram?
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#12
Quote from thehash
:
Doesn't this have dram?
It does performance is similar to MX500 or 860 EVO.
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04-19-2019 at 06:46 PM
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#14
Come to think of it, what happened to Rakuten's home page? How come it's now a cash back site?
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#15
Quote from sounreal
:
No I'd pass. The cache is like 8GB and once that's filled up the write speed slows down to like 50MB per second on the 256GB model.
8GB DRAM would be pretty good. Where'd you find that spec? Compared to Samsung EVO 860
"CACHE MEMORY
512 MB Low Power DDR4 SDRAM
(250 GB, 500 GB) "
https://www.samsung.com/semicondu...er/860evo/
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