Tests on ZHITAI PC005 Active SSD: Exploring the Secrets of the Xtacking Architecture

Source:   Editor: admin Update Time :2020-09-21

Tests on ZHITAI PC005 Active SSD: Exploring the Secrets of the Xtacking Architecture

Recently, advancement in technology has doubled the capacity and performance of Solid State Drive products in which the emergence and development of 3D NAND stacking technology is a milestone technology upgradation and product evolution that can not be ignored.

It is very simple to understand the principle of 3D stacking technology which is just like building in a given foundation so that the overall occupancy area can be multiplied. Compare with the traditional 2D NAND technology, 3D NAND can significantly increase the internal storage space per unit of flash memory, thus reducing the cost per unit capacity of SSDS and promoting the popularity of SSDS industry as a whole.

Because 3D NAND technology can significantly lower the capacity costs and promote the popularity and integration of SSD industry. Samsung had put forwarded the concept of 3D stacking technology which called V-NAND since 2013, many storage manufacturers begin to develop 3D stacking technology based on its characteristics. Major flash memory manufacturers in the world, such as Samsung’s V-NAND technology, BiSC of Kioxia and WD, Intel, Mircon and Hynix, have almost regarded 3D NAND technology as the new field in the development of SSDS industry in the future.

As a new rising storage manufacturer, YMTC had gone through innovative exploration and technological evolution for four years. Finally, 3D NAND technology based on xtacking architecture accompanied by 3D NAND stacking technology with independent intellectual property rights had successfully developed by YMTC.

Today, I receive ZHITAI PC005 Active Solid State Drive, first consumer-level Solid State Drive product based on 3D NAND technology with Xtacking architecture developed by YMTC.
How about the performance of this special ZHITAI PC005 Active SSD? And, what is actual amazing performance of 3D NAND with Xtacking architecture. Let’s have a look. Before testing, we simply summarize the outstanding features of ZHITAI PC500 Active SSD:

  1. It owns better stability owing to using 64-layer 3D NAND flash memory particle with Xtacking architecture of YMTC.
  2. It consistently provides high performance due to intelligent SLC caching technology.
  3. It has a long service life because of the design of high TBW.

01 Production Overview of ZHITAI PC005 Active NVMe SSD

The capacity of ZHITAI PC005 Active NVMe SSD includes 256GB, 512GB and 1TB. You can choose your capacity. In terms of appearance and size, ZHITAI PC005 Active NAMe SSD takes advantage of a compact M.2 2280 design, which can fully save space.



ZHITAI PC005 Active NVMe SSD adopts PCle Gen 3.0 x 4 high-speed interfaces, compatible with major desktop’s main board and working with the majority of laptops, which has not only matches the performance of desktop, but also provides better compatibility. At the same time, this SSD makes use of NVMe agreement. And, the maximum read speed of 512GB version can reach 3500MB per second, and the maximum write speed can achieve 2500MB per second. What’s more, the write speed of 1T version can up to 2900MB per second.

In addition, ZHTAI PC005 Active NVMe SSD has durable service life owing to the design of high TBW. It is said that 512GB version with high reliability possesses 320TBW, which can be used in 1.5 million hours.

Additionally, ZHITAI PC005 Active NVMe SSD also supports intelligent power consumption management. Under fully operation of SSD, it can dynamically adjust the power consumption and heat and bring consistently high-performance experience via two intelligent automatic power consumption management technologies. Simultaneously, ZHITAI PC005 Active SSD is compatible with original SMART software through which users can oversee conditions of SSD.


02 Detail about Xtacking Architecture

Before introducing the internal architecture, we need to know about Xtacking architecture of YMTC which had launched development and research on 3D NAND from 2014. Until August 2018, YMTC had finally developed Xtacking architecture through technological exploration and innovative research. After release, Xtacking architecture had immediately attached Research & Development industry’s attention while received several prizes both at home and abroad, including Flash Memory Summit (FMS) , China Flash Market Summit (CFMS) ,   China Information Technology Expo  (CITE)  and so on.

Compare with other 3D NAND technologies, the major feature of Xtacking architecture is electric circuit which is responsible for I/O transmission and memory units on two independent wafers and then bonds the wafers through Xtacking process. It is convenient to choose an advanced manufacturing process and reduce the complexity of manufacturing process, thus enabling NAND to achieve higher I/O transmission speeds, higher density, and smaller chip area.

In terms of products with the traditional architecture of previous generation , the 64-layer 3D NAND product with YMTC Xtacking architecture, had significantly improved on storage capacity per unit and data transmission rate in which the capacity per unit area is increased by 5X and the data transfer rate is increased from 400MB/s to 800MB/s.

03 ZHITAI PC005 Active NVMe SSD:Particle+Main Control

In terms of the internal architecture, ZHITAI PC005 Active NVMe SSD adopts single -sided PCB design, integrated master control, flash and external cache particles.

In terms of main control, it is equipped with Silicon Motion SM2262EN, which supports PCIe G3×4 channel NVMe 1.3 specification and 8 NAND channel designs. The maximum sequential read speed is up to 3.5GB/s, sequential write speed up to 3.0GB/s, random read and write up to 420K IOPS and 420K IOPS.

In terms of particle, ZHITAI PC005 Active NVMe SSD is equipped with two 64 3D NAND flash memory particle , with a capacity of 256GB. The more layers there are on the stack, the more 3D NAND flash capacity there is. And the more layers you stack, the more capacity you get. This 3D NAND takes into account capacity, performance and reliability, and can have higher storage performance and storage density, providing high quality performance guarantee for users who need large capacity data interaction and improve computer speed.

In terms of caching, the use of the South Asia technology of the original factory cache particles.

04 Performance Test

As for performance test, we will conduct continuous performance test, 4K random test, HD Tune stability test and other theoretical performance tests respectively. We used three extensively used software, including Crystal Disk Mark, ATTO and Txbench to conduct a triple test to test the continuous performance of SSDS mutually.

Crystal Disk Mark Test

In Crystal Disk Mark test, we will firstly test the theoretical continuous performance of the ZHITAI PC005 Active NVMe SSD.

The Crystal Disk Mark test showed that the ZHITAI PC005 Active NVMe SSD had a reading speed of 3494.7mb /s and a writing speed of 2486.6mb /s, which reach the standard of the first echelon of the PCIe 3.0 SSD.


As the reference point is designated as the size of the actual application document class file, the ATTO test can reflect the maximum read and write performance of documents with different radix. With the outstanding throughput performance of ZHITAI PC005 Active NVMe SSD in different blocks, the maximum read and write speed in the ATTO test reached 3090MB/s and 2320MB/s.

Txbench Test

In Txbench test, the software will test its memory property in different queues and different data blocks, simulating conditions of its daily use.

In Txbench test, the 512GB ZHITAI PC005 Active NVMe SSD also achieved a good performance, with the maximum continuous read performance of 3,383.224 MB/s and the maximum continuous write performance of more than 2465MB/s, which was basically consistent with the previous results of Crystal Disk Mark test.

04 4K Random Test

The next is the 4K random test. We will use AS SSD to implement this test. AS SSD Benchmark is a standard test program designed for SSD testing. It contains tests of key data, such as tests of AS continuous read and write, 4KB random read and write with single thread, 4KB random read and write with 64 threads, and disk seek time. And its results will be standardized according to the formula, which can more scientifically reflect the real performance of SSD.

In the 4KB random performance test by AS SSD, the 4K reading speed of 512GB ZHITAI PC005 Active NVMe SSD with 64 threads reached 290K IOPS and its 4K writing speed with threads reached 357469 IOPS, which has reached the international standard of PCIe 3.0 hard disk.

05 Stability Test

The stability of solid-state drives is essential. Many SSDS in the market are equipped with SLC acceleration mechanism, which will lead to obvious differences in the performance during voluminous data transmission processes, which cannot truly estimate the product performance. SO we used HD Tune in this test to verify the real performance of the 512GB ZHITAI PC005 Active NVMe SSD.

In HD Tune stability test, we set file length as 10000MB to test the standards of actual reading and writing of the 512GB ZHITAI PC005 Active NVMe SSD.

The HD Tune software showed that the disk speed of the 512GB ZHITAI PC005 Active NVMe SSD began to drop when the file size was about 6GB because most TLC solid-state drives have a portion of their memory capacity that simulate SLC particles to solve the problem of disk speed. According to this test, the cache capacity of this hard disk is around 6GB. In addition, in the test with a file length of 10000MB, the image showed that the overall trend of the hard disk was floating within a very small range and the general performance was relatively stable.

06 Summary

ZHITAI PC005 Active is a high-performance NVMe solid-state drive. The Crystal Disk Mark test showed an impressive read speed of 3494.7MB/s and write speed of 2486.6MB/s. And it is equipped with 64-layer 3D NAND flash particles based on Xtacking architecture, which provides better performance and reliability and further meets users' demand for voluminous data exchanges.


Players want a faster opening speed and loading speed of the game, while professionals want a higher efficiency of creation, both of which are important demands for the development of hard disk. Therefore, only continuous innovation can meet the future needs of high performance, and the Xtacking architecture particles on the ZHITAI PC005 Active NVMe SSD perfectly embodies the notion of innovation.

As a 3D NAND stack technology independently developed by Yangtze Memory, Xtacking architecture just like a light in the dark night. Although its light is weak, it can illuminate the road in front of it. We believe that with the innovative, active and progressive exploration of Yangtze Memory, Xtacking architecture and ZHITAI series will make a difference in the solid-state drive industry.