One Design, Two Products: The SanDisk Ultra 3D (1TB) and WD Blue 3D (1TB) SSD Reviews, with BiCS 3D NAND
by Billy Tallis on September 14, 2017 9:00 AM ESTMixed Random Performance
Our test of mixed random reads and writes covers mixes varying from pure reads to pure writes at 10% increments. Each mix is tested for up to 1 minute or 32GB of data transferred. The test is conducted with a queue depth of 4, and is limited to a 64GB span of the drive. In between each mix, the drive is given idle time of up to one minute so that the overall duty cycle is 50%.
Orange is for the new drives, Blue is for the previous generation models
The mixed random I/O performance of the WD Blue 3D NAND and the SanDisk Ultra 3D is significantly better than the previous generation, but the improvement is not enough to match any of the other 3D NAND SSDs. The Samsung, Intel and Micron drives with 3D NAND are all still much faster overall on this test.
The power efficiency of the WD/SanDisk drives has improved to a larger degree than performance, but is still slightly worse than Samsung's 850 EVO and 850 PRO, and is far lower than the Crucial MX300 and the Intel 545s.
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Both generations of WD/SanDisk drives show fairly flat performance across most of the mixed random I/O test, with only a modest spike at the end when the workload shifts to pure random writes. Most of the other drives either have steady performance increases across the test as the proportion of writes grows, or a much larger spike in performance at the very end.
Mixed Sequential Performance
Our test of mixed sequential reads and writes differs from the mixed random I/O test by performing 128kB sequential accesses rather than 4kB accesses at random locations, and the sequential test is conducted at queue depth 1. The range of mixes tested is the same, and the timing and limits on data transfers are also the same as above.
The mixed sequential I/O performance of the WD Blue 3D NAND and SanDisk Ultra 3D is comparable to the Intel and Micron 3D NAND drives, and only slightly behind Samsung's 850 PRO and 850 EVO.
The new WD/SanDisk drives have good power efficiency on the mixed sequential I/O test, but the Intel/Micron 3D NAND SSDs are still slightly better, and the OCZ VX500 is still on top.
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The performance of the WD Blue 3D NAND and SanDisk Ultra 3D across the mixed sequential I/O test is mostly flat, with the occasional blip. The Samsung drives achieve their standout performance by maintaining better performance through the read-heavy first half of the test, and only experiencing a relatively short and shallow drop in performance during the second half of the test. The Crucial MX300 achieves a very similar overall average to the WD/SanDisk drives but with relatively lower performance during the read-heavy portions of the test and clearly higher performance on the write-heavy half.
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Rictorhell - Friday, September 15, 2017 - link
Samsung is slated to announce an updated line of new m.2 NVME SSD's at some point this month or in the 4th quarter. Their current m.2 lineup maxes out at 2tb and I've been wondering if they will release a 4tb m.2, even at a sky-high price.Smell This - Thursday, September 14, 2017 - link
Sammy's 'Data Migration' & 'Magician' tools have been bullet-proof for me.Not sure about 'Acronis True Image WD Edition' ... Acronis True Image, surprisingly, has let me down on several occasions.
metayoshi - Friday, September 15, 2017 - link
I can only speak for myself, obviously, but I've been using Acronis True Image for years with no issue. I only use the most basic features like cloning disks and scheduled backups of full disks, but for those it works just fine.mapesdhs - Thursday, September 14, 2017 - link
Billy, any idea what causes those horrible latency spikes with the VX500? They're so big, I was surprised the commentary didn't mention it.Billy Tallis - Thursday, September 14, 2017 - link
Toshiba won't disclose controller architecture details, but all of the smaller capacities of the VX500 have no external DRAM, and the 1TB has only 256GB of external DRAM. We don't know how much memory is in the controller package itself, but the 1TB VX500 certainly has less memory than a typical mainstream SSD even though it's not truly DRAMless. The VX500 also uses SLC caching even though it's a MLC drive, and that tends to lead to greater performance variability (see the Crucial MX200).Glaring_Mistake - Thursday, September 14, 2017 - link
If I remember correctly the VX500 is entirely DRAMless for the smaller capacities that instead use a small amount of SRAM (think it's 32MB).But that was not enough for the 1TB drive so it differs from the other capacitites in that it has a small amount of DRAM at 256MB.
That is still just one fourth of the usual amount of DRAM used for a drive of that capacity however.
At any rate I believe that is the reason as to why latency may suffer a bit; not enough DRAM.
eddieobscurant - Friday, September 15, 2017 - link
"Meanwhile, the SanDisk Ultra 3D offers higher write endurance ratings and lower power consumption for a slightly lower price. The Ultra 3D makes more sense for most consumers."How does it make more sense? The average consumer won't even use the 1/5th of the endurance ratings, but choosing the extra 2 years of warranty of samsung makes a lot of more sense.
Adramtech - Sunday, September 17, 2017 - link
It's amusing to see people complain about the NAND & DRAM shortage and higher prices, and simutaneously say that there's "finally" something to compete with EVO. For years memory was so cheap it put scores of companies out of business and therefore less competition to compete with the EVO. If you want competitive products, these companies need to make money to drive multi-billion dollar Fab & R&D investments. Also, there is no price fixing, the AI revolution, big data, ADAS systems are eating up all the memory and storage. Not to mention HDDs switching over to SSD everywhere you look.kavita - Monday, September 18, 2017 - link
QA Testing the comments on Production.msroadkill612 - Monday, September 18, 2017 - link
Talk about tail wag the dog.That same expensive nand, can be rigged as 500MB/s sata ssd, OR, at about 5x+ that speed if the nvme (aka pcie ssdS) interface is used.
What a waste.
Why? Until very recent AMD TR, niggardly lane quotas on platforms (not unreasonably pre nvme ssdS) mean few have much room for devices that use 4 lanes each.
Sata only sells because its the port folks have readily available on their current pc. Even so, settling for 1/5 of an expensive devices capabilities seems rich.
i.e. - u r mad to buy sata.
Far better to try hard to find a way of improving your interface than settle for gimped ssdS.
Pcie3 nvme should be backwardly compatible w/ pcie2, so by running nvme on pcie2 lanes, they ares slower, but more than double the speed of, sata, and you have invested in a non gimped drives.
While i am at it, If I were buying a ryzen, my plan would be one of each. 2x nvme ssds, on a mobo like msi's am4 x370 moboS, w/ 2x onboard nvme ports, but due to ryzen lane limits, the second must be pcie2. It yields a very fast ssd, and a very, very fast ssd. Not bad.
Thats all your ryzen lanes used after the 16x lane gpu is counted, but u have stacks of ports on the chipset for other needs.
Far better to get an m.2 port pcie adaptor card, lanes permitting, and an nvme ssd.
It grates to hear common remark "oh, dont worry, you wont perceive the nvme speed difference". Yeah right.
The champ 960 pro 500GB nvme is rated for 3400GB/s read seq & 2250~GB/s write. Like u r not going to notice if an app ever swaps out to disk or works on scratch files at such differing relative speeds. BS.
Factor in also that sata ports from chipsets are handicapped in various ways, so it pays to investigate the exact nature of the sata port you use.
A notion for some lane starved users to consider is getting by with 8 lanes for your 16 lane gpu, thus freeing up a juicy 8x pcie3 lanes. Even some gamers credibly say it works as well. Google it.