Here you will find a detailed speed, performance and benchmark test review. Tested was the M.2 NVMe SSD S660 with 1TB (FX-S660-1TB) from the brand fanxiang.
| Technical specifications (manufacturer information) | |
| Product image |
|
| Manufacturer | fanxiang |
| Model number | FX-S660-1TB |
| Capacity | 1024 GB (932 GiB) |
| pSLC cache | 118 GB approx. |
| Read speed | 4800 MB/s |
| Write speed | 4500 MB/s |
| Interface | PCIe 4.0 x4 |
| Connector | M.2 2280 |
| Memory module (NAND) | TLC |
| DRAM cache | No |
| TBW (Total Bytes Written) | 700 terabyte |
| Controller | n/a |
v0.34a OS: 10.0 build 19045 Drive : 0(NVME) Scsi : 2 Driver : W10 Model : Fanxiang S660 1TB Fw : SN11909 HMB : 32768 - 32768 KB (Enabled, 32 M) Size : 953869 MB [1000.2 GB] LBA Size: 512 AdminCmd: 0x00 0x01 0x02 0x04 0x05 0x06 0x08 0x09 0x0A 0x0C 0x10 0x11 0x14 0x80 0x81 0x82 0x84 0xC1 0xC2 I/O Cmd : 0x00 0x01 0x02 0x04 0x05 0x08 0x09 Firmware id string[0C0] : MKSSD_100000000119093100,May 7 2023,01:39:05,MAP1602,MRRHBA4C Project id string[080] : r:/Code/1602/DVT/X2-9060/SVN11909_For_ReadDistrubIssue Controller : MAP1602 NAND string : CYAxxTE1B1xC3B List may not be complete Ch0CE0: 0x9b,0xc4,0x28,0x49,0x20,0x0,0x0 - YMTC 3dv3-128L(x2-9060) TLC 16k 512Gb/CE 512Gb/die 4Plane/die Ch1CE0: 0x9b,0xc4,0x28,0x49,0x20,0x0,0x0 - YMTC 3dv3-128L(x2-9060) TLC 16k 512Gb/CE 512Gb/die 4Plane/die Ch2CE0: 0x9b,0xc4,0x28,0x49,0x20,0x0,0x0 - YMTC 3dv3-128L(x2-9060) TLC 16k 512Gb/CE 512Gb/die 4Plane/die Ch3CE0: 0x9b,0xc4,0x28,0x49,0x20,0x0,0x0 - YMTC 3dv3-128L(x2-9060) TLC 16k 512Gb/CE 512Gb/die 4Plane/die
We put the fanxiang NVMe M.2 SSD through a detailed test. You can find the test result / test report here:
The standard test was performed with a 5 GB file. A total score of 5400 points was achieved.
A common everyday scenario is simulated here. Three test folders are created:
The three folders are copied using the Windows copy command (cache remains enabled). The real-world test from 19 December 2023 shows performance during simultaneous write and read operations. The lower the duration, the better.
| AS SSD Copy Benchmark | Transfer rate: | Duration: |
|---|---|---|
| ISO two large files |
2,165.99 MB/s |
1.06 s |
| Program typical program folder with many small files |
1,146.48 MB/s |
6.14 s |
| Game a game folder with small and large files |
1,930.82 MB/s |
3.58 s |
Here, speed is measured depending on how compressible the data is.
Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer: 4800 MB/s and 4500 MB/s) the fanxiang SSD is determined.

| CDM | Read [MB/s] | Write [MB/s] |
|---|---|---|
| SEQ1M Q8T1 |
5,004.21 |
4,290.24 |
| SEQ1M Q1T1 |
4,519.32 |
4,325.43 |
| RND4K Q32T16 |
2,530.21 |
2,227.53 |
| RND4K Q1T1 |
61.62 |
180.64 |
| CDM | Read [IOPS] | Write [IOPS] |
|---|---|---|
| SEQ1M Q8T1 |
4,772.40 |
4,091.50 |
| SEQ1M Q1T1 |
4,310.00 |
4,125.10 |
| RND4K Q32T16 |
617,728.00 |
543,830.00 |
| RND4K Q1T1 |
15,043.50 |
44,101.80 |
| CDM | Read [µs] | Write [µs] |
|---|---|---|
| SEQ1M Q8T1 |
1,674.99 |
1,950.69 |
| SEQ1M Q1T1 |
231.87 |
242.23 |
| RND4K Q32T16 |
827.29 |
940.65 |
| RND4K Q1T1 |
66.37 |
22.55 |
A long-term test was performed to fully utilize the storage. You can see from when a possible cache is full and write performance drops. A test file of 300 GB was written to the medium. After approx. 118 GB, the cache was full and performance was throttled.
The test file could at least be read with an average read speed of 3,836 MB/s and written at 1,744 MB/s.
HD Tune writes a 5 GB file to the fanxiang NVMe M.2 SSD. The transfer data of the read speed is displayed graphically. The minimum, maximum and average values are also determined. The measured access time and burst rate are also shown.

Here, a 256 MB file is written to the fanxiang NVMe M.2 SSD multiple times. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster writing and reading usually becomes.

Similar to HD Tune, a 500 MB file is written to the fanxiang NVMe M.2 SSD here. The transfer data is displayed. The more consistent the line, the better. Unfortunately, the tool no longer works correctly from around 4,000 MB/s and no line is displayed (and sometimes incorrect min/max data is shown).

You can find information about the test system at the bottom of the homepage.
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