Notebookcheck Logo

Samsung PM951 NVMe MZVLV256 vs WDC PC SN520 SDAPMUW-256G vs Samsung PM951 NVMe 512 GB

Samsung PM951 NVMe MZVLV256

► remove from comparison

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

WDC PC SN520 SDAPMUW-256G

► remove from comparison 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.

Samsung PM951 NVMe 512 GB

► remove from comparison

The Samsung PM951 is a PCIe (NVMe) based solid state drive with a capacity of 512 GB. It is an M.2 22x80 type drive designed primarily with laptops in mind. As of Q1 2020, the SSD's perfomance roughly corresponds to the budget segment of modern solid state memory.

Notebookcheck says:

... The 512 GB NVMe Samsung PM951 SSD easily outperforms SATA III-based SSDs on older notebooks and even some newer ones that have yet to make the transition to the newer controller or have decided to cut back on the feature - Dell XPS 13 9350 Laptop Review | February 2016

show full text
Samsung PM951 NVMe MZVLV256WDC PC SN520 SDAPMUW-256GSamsung PM951 NVMe 512 GB
TypeSSDSSDSSD
SizeM.2M.2 2242M.2
Capacity256 GB256 GB512 GB
InterfaceNVMeNVMeNVMe
Announced01.09.2015 01.11.2015

Benchmarks

Performance Rating - DiskSpd - SN520 SDAPMUW-256G
16.6 pt (19%)
Seagate ST1000LM014 Solid State Hybrid Drive
0.709 -96%
...
Netac S930E8/256GPN
16.2 -2%
SK Hynix BC501 HFM512GDJTNG
16.2 -2%
WDC PC SN520 SDAPMUW-512
16.3 -2%
WDC PC SN530 SDBPTPZ-256G
16.3 -2%
Kingston KC2500 1 TB SKC2500M81000G
16.3 -2%
Toshiba KBG30ZMT512G
16.4 -1%
Silicon Motion AZW 256G M.2280 NVMe 4X 200725 D
16.4 -1%
Toshiba Kioxia XG6 KXG60PNV1T02
16.5 -1%
Apple SSD AP1024 7171
16.5 -1%
WDC PC SN520 SDAPMUW-256G
16.6
Kioxia BG5 KBG5AZNT256G
16.6 0%
AirDisk AFF 10-512G
16.6 0%
Kingston OM3PDP3512B
16.6 0%
Netac S930E 1TB
16.6 0%
Samsung PM991 MZALQ512HALU
16.7 1%
Kingston OM8PCP3512F-AB
16.8 1%
Kingston OM8PDP3512B-AI1
16.9 2%
WDC PC SN720 SDAPNTW-512G
16.9 2%
Kingston OM8PDP3256B
17 2%
...
Kingston Fury Renegade G5
87.4 427%
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%)
min: 347.1     avg: 673     median: 769 (13%)     max: 805 MB/s
AS SSD - Copy Program
min: 102.3     avg: 172.5     median: 165.4 (6%)     max: 262.3 MB/s
253.1 MB/s (9%)
min: 211.9     avg: 281.9     median: 295.1 (11%)     max: 325.3 MB/s
AS SSD - Copy ISO
min: 274.1     avg: 376.8     median: 324.6 (3%)     max: 687 MB/s
754 MB/s (7%)
min: 339.5     avg: 806     median: 878.5 (8%)     max: 1127 MB/s
AS SSD - Score Total
min: 1190     avg: 1936     median: 1920 (12%)     max: 2335 Points
1647 Points (10%)
min: 681     avg: 2165     median: 2410 (15%)     max: 3158 Points
AS SSD - Score Write
min: 60     avg: 344.8     median: 380 (5%)     max: 429 Points
659 Points (9%)
min: 54     avg: 522     median: 669.5 (9%)     max: 694 Points
AS SSD - Score Read
min: 777     avg: 1083     median: 1038.5 (17%)     max: 1325 Points
657 Points (10%)
min: 441     avg: 1117     median: 1173 (19%)     max: 1679 Points
AS SSD - Access Time Write *
min: 0.03     avg: 0.6     median: 0 (0%)     max: 4.206 ms
0 ms (0%)
min: 0.031     avg: 1.1     median: 0 (0%)     max: 4.123 ms
AS SSD - Access Time Read *
min: 0.043     avg: 0.1     median: 0.1 (0%)     max: 0.077 ms
0.1 ms (0%)
min: 0.038     avg: 0     median: 0 (0%)     max: 0.058 ms
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%)
min: 38.56     avg: 393.9     median: 502.5 (9%)     max: 532 MB/s
AS SSD - 4K-64 Read
min: 611     avg: 914     median: 870 (17%)     max: 1153 MB/s
467.7 MB/s (9%)
min: 288.9     avg: 938     median: 982.5 (19%)     max: 1497 MB/s
AS SSD - 4K Write
min: 0.96     avg: 101.6     median: 110.7 (22%)     max: 137.5 MB/s
138.3 MB/s (27%)
min: 0.88     avg: 82.1     median: 105.5 (21%)     max: 116.5 MB/s
AS SSD - 4K Read
min: 35.2     avg: 37.6     median: 37.8 (12%)     max: 39.6 MB/s
35.9 MB/s (11%)
min: 31.86     avg: 34.6     median: 34 (11%)     max: 38.29 MB/s
AS SSD - Sequential Write
min: 158.3     avg: 269.9     median: 283.3 (3%)     max: 295.5 MB/s
1215 MB/s (11%)
min: 150.3     avg: 460.3     median: 560.5 (5%)     max: 570 MB/s
AS SSD - Sequential Read
min: 1260     avg: 1315     median: 1330.5 (10%)     max: 1347 MB/s
1535 MB/s (12%)
min: 1184     avg: 1444     median: 1505.5 (12%)     max: 1579 MB/s
CrystalDiskMark 3.0 - 4K QD32 Write
min: 231.5     avg: 295.2     median: 302.7 (29%)     max: 312.2 MB/s
min: 225.4     avg: 303.7     median: 234.1 (22%)     max: 482.4 MB/s
CrystalDiskMark 3.0 - 4K QD32 Read
min: 411.2     avg: 527     median: 513 (40%)     max: 614 MB/s
min: 254.4     avg: 487.3     median: 542 (42%)     max: 610 MB/s
CrystalDiskMark 3.0 - 4K Write
min: 119     avg: 139.8     median: 138.6 (4%)     max: 153.4 MB/s
min: 104     avg: 129.8     median: 132.4 (4%)     max: 142.2 MB/s
CrystalDiskMark 3.0 - 4K Read
min: 34.8     avg: 40.7     median: 41.8 (1%)     max: 43.4 MB/s
min: 37.02     avg: 40.1     median: 41.4 (1%)     max: 42.59 MB/s
CrystalDiskMark 3.0 - 512K Write
min: 294.7     avg: 304     median: 305.5 (3%)     max: 311 MB/s
min: 176.6     avg: 443.6     median: 588 (7%)     max: 596 MB/s
CrystalDiskMark 3.0 - 512K Read
min: 613     avg: 647     median: 644.5 (14%)     max: 682 MB/s
min: 428.7     avg: 584     median: 615 (13%)     max: 674 MB/s
CrystalDiskMark 3.0 - Sequential Write
min: 283.6     avg: 303.1     median: 305.4 (3%)     max: 314 MB/s
min: 525     avg: 577     median: 590 (6%)     max: 594 MB/s
CrystalDiskMark 3.0 - Sequential Read
min: 1122     avg: 1220     median: 1209 (15%)     max: 1322 MB/s
min: 984     avg: 1210     median: 1263 (16%)     max: 1291 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 (15%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Write 4K Q32T1
457.4 MB/s (15%)
CrystalDiskMark 5.2 / 6 - CDM 5/6 Read 4K Q32T1
505 MB/s (8%)
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
min: 4895     avg: 4982     median: 5026 (98%)     max: 5026 Points
HD Tune Transfer Rate Minimum - HD Tune Transfer Rate Minimum
70.7 MB/s (4%)
min: 111.1     avg: 413.1     median: 413.1 (21%)     max: 715 MB/s
HD Tune Transfer Rate Average - HD Tune Transfer Rate Average
111.6 MB/s (5%)
min: 889     avg: 971     median: 971 (41%)     max: 1053 MB/s
HD Tune Transfer Rate Maximum - HD Tune Transfer Rate Maximum
140.2 MB/s (6%)
min: 945     avg: 1059     median: 1058.5 (42%)     max: 1172 MB/s
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 (11%)
DiskSpd - DiskSpd 4k_q32t16_read
665 MB/s (8%)
DiskSpd - DiskSpd seq_write
1046 MB/s (10%)
DiskSpd - DiskSpd seq_read
1107 MB/s (14%)
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%)

Average Benchmarks Samsung PM951 NVMe MZVLV256 → 100% n=14

Average Benchmarks WDC PC SN520 SDAPMUW-256G → 149% n=14

Average Benchmarks Samsung PM951 NVMe 512 GB → 158% n=14

- Range of benchmark values for this graphics card
red legend - Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

v1.33
log 28. 19:01:54

#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 checking url part for id 758 +0s ... 0s

#4 redirected to Ajax server, took 1751130114s time from redirect:0 +0s ... 0s

#5 did not recreate cache, as it is less than 5 days old! Created at Thu, 26 Jun 2025 18:51:47 +0200 +0s ... 0s

#6 composed specs +0.002s ... 0.003s

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

#8 getting avg benchmarks for device 804 +0.001s ... 0.003s

#9 got single benchmarks 804 +0.005s ... 0.008s

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

#11 got single benchmarks 3524 +0.001s ... 0.015s

#12 getting avg benchmarks for device 758 +0s ... 0.016s

#13 got single benchmarks 758 +0.003s ... 0.019s

#14 got avg benchmarks for devices +0s ... 0.019s

#15 min, max, avg, median took s +0.125s ... 0.144s

#16 return log +0s ... 0.144s

Please share our article, every link counts!
Mail Logo
> 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)