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Samsung PM951 NVMe MZVLV256 vs WDC PC SN520 SDAPMUW-256G

Samsung PM951 NVMe MZVLV256

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The Samsung PM951 MZVLV256 is an NVMe class solid state drive with a capacity of 256 GB.

WDC PC SN520 SDAPMUW-256G

SN520 SDAPMUW-256G

The Western Digital PC SN520 NVMe SSD 256GB (M.2 2242, SDAPMUW-256G) is a small mid range SSD. It is specified at 1700 / 1300 MB/s sequential read / write and 220k / 175k IOPS 4k. The SSD uses 3D-NAND TLC from Toshiba/WD and is rated at a TBW of 200TB / MTBF of 1.75 Mio h.

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Samsung PM951 NVMe MZVLV256WDC PC SN520 SDAPMUW-256G
TypeSSDSSD
SizeM.2M.2 2242
Capacity256 GB256 GB
InterfaceNVMeNVMe
Announced01.09.2015

Benchmarks

Performance Rating - DiskSpd - SN520 SDAPMUW-256G
16.8 pt (19%)
Seagate ST1000LM014 Solid State Hybrid Drive
0.717 -96%
...
Toshiba KBG30ZMT512G
16.5 -2%
Silicon Motion AZW 256G M.2280 NVMe 4X 200725 D
16.5 -2%
Apple SSD AP1024 7171
16.6 -1%
Toshiba Kioxia XG6 KXG60PNV1T02
16.6 -1%
Kioxia BG5 KBG5AZNT256G
16.7 -1%
Netac S930E 1TB
16.8 0%
Kingston OM3PDP3512B
16.8 0%
AirDisk AFF 10-512G
16.8 0%
Samsung PM991 MZALQ512HALU
16.8 0%
WDC PC SN520 SDAPMUW-256G
16.8
Kingston OM8PCP3512F-AB
16.9 1%
WDC PC SN720 SDAPNTW-512G
17 1%
Kingston OM8PDP3512B-AI1
17 1%
Kingston OM8PDP3256B
17.1 2%
Phison 512GB PA6620060U
17.2 2%
WDC PC SN530 SDBPNPZ-265G
17.3 3%
Samsung PM991 MZVLQ512HBLU
17.3 3%
KDI OM3PDP3-AD NVMe KDI 256GB
17.4 4%
Lenovo UMIS AM620 RPJTJ512MEE1OWX
17.4 4%
...
Kingston Fury Renegade G5 4TB
87.8 423%
0%
100%
Restrict / Search: Model: Max. age: years
AS SSD - Copy Game
min: 188.2     avg: 234.9     median: 245.2 (4%)     max: 252.3 MB/s
546 MB/s (9%)
AS SSD - Copy Program
min: 102.3     avg: 172.5     median: 165.4 (6%)     max: 262.3 MB/s
253.1 MB/s (9%)
AS SSD - Copy ISO
min: 274.1     avg: 376.8     median: 324.6 (1%)     max: 687 MB/s
754 MB/s (3%)
AS SSD - Score Total
min: 1190     avg: 1936     median: 1920 (12%)     max: 2335 Points
1647 Points (10%)
AS SSD - Score Write
min: 60     avg: 344.8     median: 380 (5%)     max: 429 Points
659 Points (9%)
AS SSD - Score Read
min: 777     avg: 1083     median: 1038.5 (17%)     max: 1325 Points
657 Points (10%)
AS SSD - Access Time Write *
min: 0.03     avg: 0.6     median: 0 (0%)     max: 4.206 ms
0 ms (0%)
AS SSD - Access Time Read *
min: 0.043     avg: 0.1     median: 0.1 (0%)     max: 0.077 ms
0.1 ms (0%)
AS SSD - 4K-64 Write
min: 43.14     avg: 216.2     median: 236.1 (4%)     max: 282.8 MB/s
399.6 MB/s (7%)
AS SSD - 4K-64 Read
min: 611     avg: 914     median: 870 (17%)     max: 1153 MB/s
467.7 MB/s (9%)
AS SSD - 4K Write
min: 0.96     avg: 101.6     median: 110.7 (22%)     max: 137.5 MB/s
138.3 MB/s (27%)
AS SSD - 4K Read
min: 35.2     avg: 37.6     median: 37.8 (12%)     max: 39.6 MB/s
35.9 MB/s (11%)
AS SSD - Sequential Write
min: 158.3     avg: 269.9     median: 283.3 (3%)     max: 295.5 MB/s
1215 MB/s (11%)
AS SSD - Sequential Read
min: 1260     avg: 1315     median: 1330.5 (10%)     max: 1347 MB/s
1535 MB/s (12%)
CrystalDiskMark 3.0 - 4K QD32 Write
min: 231.5     avg: 295.2     median: 302.7 (28%)     max: 312.2 MB/s
CrystalDiskMark 3.0 - 4K QD32 Read
min: 411.2     avg: 527     median: 513 (40%)     max: 614 MB/s
CrystalDiskMark 3.0 - 4K Write
min: 119     avg: 139.8     median: 138.6 (4%)     max: 153.4 MB/s
CrystalDiskMark 3.0 - 4K Read
min: 34.8     avg: 40.7     median: 41.8 (1%)     max: 43.4 MB/s
CrystalDiskMark 3.0 - 512K Write
min: 294.7     avg: 304     median: 305.5 (3%)     max: 311 MB/s
CrystalDiskMark 3.0 - 512K Read
min: 613     avg: 647     median: 644.5 (14%)     max: 682 MB/s
CrystalDiskMark 3.0 - Sequential Write
min: 283.6     avg: 303.1     median: 305.4 (3%)     max: 314 MB/s
CrystalDiskMark 3.0 - Sequential Read
min: 1122     avg: 1220     median: 1209 (14%)     max: 1322 MB/s
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K
173.1 MB/s (16%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K
49.3 MB/s (1%)
CrystalDiskMark 5.2 / 6 - CDM 5 Write Seq
1188 MB/s (6%)
CrystalDiskMark 5.2 / 6 - CDM 5 Read Seq
1278 MB/s (14%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K Q32T1
457.4 MB/s (10%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K Q32T1
505 MB/s (7%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write Seq Q32T1
1258 MB/s (8%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read Seq Q32T1
1742 MB/s (9%)
PCMark 8 - PCMark 8 Storage v2
min: 4922     avg: 4955     median: 4925 (96%)     max: 5018 Points
HD Tune Transfer Rate Minimum - HD Tune Transfer Rate Minimum
70.7 MB/s (4%)
HD Tune Transfer Rate Average - HD Tune Transfer Rate Average
111.6 MB/s (5%)
HD Tune Transfer Rate Maximum - HD Tune Transfer Rate Maximum
140.2 MB/s (6%)
DiskSpd - DiskSpd 4k_q1t1_write
181.6 MB/s (42%)
DiskSpd - DiskSpd 4k_q1t1_read
41.8 MB/s (12%)
DiskSpd - DiskSpd 4k_q32t16_write
683 MB/s (10%)
DiskSpd - DiskSpd 4k_q32t16_read
665 MB/s (8%)
DiskSpd - DiskSpd seq_write
1046 MB/s (10%)
DiskSpd - DiskSpd seq_read
1107 MB/s (12%)
DiskSpd - DiskSpd seq_q8t1_write
888 MB/s (6%)
DiskSpd - DiskSpd seq_q8t1_read
1727 MB/s (11%)
DiskSpd - DiskSpd Loop seq_q8t1_read
1723 MB/s (11%)
- Range of benchmark values for this graphics card
red legend - Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

Average Benchmarks

Samsung PM951 NVMe MZVLV256 → 100% n=14

WDC PC SN520 SDAPMUW-256G → 149% n=14

Average of the median scores above. 1 ... This benchmark is not used for the average calculation

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  • $351.49
    Samsung 990 PRO SSD 2TB NVMe M.2 PCIe Gen4, M.2 2280 Internal Solid State Hard Drive, Seq. Read Speeds Up to 7,450 MB/s for High End Computing, Gaming, and Heavy Duty Workstations, MZ-V9P2T0B/AM
  • $200.19
    Samsung 990 PRO SSD 1TB PCIe 4.0 M.2 2280 Internal Solid State Hard Drive, Seq. Read Speeds Up to 7,450 MB/s for High End Computing, Gaming, and Heavy Duty Workstations, MZ-V9P1T0B/AM
  • $399.99
    Samsung SSD 9100 PRO 2TB, PCIe 5.0x4 M.2 2280, Seq. Read Speeds Up to 14,700MB/s, Best for AI Computing, Gaming and Heavy Duty Workstations (MZ VAP2T0B/AM)
  • $99.00
    Samsung SSD 256GB PM981a M.2 2280 PCIe Gen3 x4 NVMe MZVLB256HBHQ SED Opal Solid State Drive
  • $164.73
    Samsung SSD 9100 PRO 1TB, PCIe 5.0x4 M.2 2280, Seq. Read Speeds Up to 14,700MB/s, Best for AI Computing, Gaming, and Heavy Duty Workstations (MZ VAP1T0B/AM)

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v1.35
log 17. 15:35:48

#0 ran 0s before starting gpusingle class +0s ... 0s

#1 checking url part for id 804 +0s ... 0s

#2 checking url part for id 3524 +0s ... 0s

#3 redirected to Ajax server, took 1781703347s time from redirect:0 +0s ... 0s

#4 did not recreate cache, as it is less than 5 days old! Created at Tue, 16 Jun 2026 23:08:37 +0200 +0s ... 0s

#5 composed specs +0.003s ... 0.003s

#6 did output specs +0s ... 0.003s

#7 getting avg benchmarks for device 804 +0.001s ... 0.004s

#8 got single benchmarks 804 +0.006s ... 0.009s

#9 getting avg benchmarks for device 3524 +0.005s ... 0.014s

#10 got single benchmarks 3524 +0.002s ... 0.016s

#11 got avg benchmarks for devices +0s ... 0.016s

#12 min, max, avg, median took s +0.071s ... 0.087s

#13 return log +0.752s ... 0.839s

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > Benchmarks / Tech > HDD/SSD Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2023-07- 1)