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SamsungMZ-7PD128BW
CrucialCT128M550SSD1
▲ 542,763 ▼

Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC. Release date: Q4 2012.

VS
▲ 51137 ▼

Controller: Marvell 88SS9189. Flash Memory: Micron Synchronous 20nm MLC. Release date: Q1 2014.

Effective Speed 
+5%
Real World Speed
Performance profile from 37,515 user samples
Benchmark your SSD here
34,842 User Benchmarks
Best Bench: 110% 62GB free
Worst Bench: 62% 119GB free
Poor: 62% Great: 110%
SPEED RANK: 336th / 1072
2,673 User Benchmarks
Best Bench: 104% 72GB free
Worst Bench: 58% 7GB free (System drive)
Poor: 58% Great: 104%
SPEED RANK: 396th / 1072
Effective Speed
Effective SSD Speed 		89.5 % +5% 85.6 %
Average Score 
+3%
Read
Avg. Sequential Read Speed 		444 MB/s Slightly faster read speed.
+6% 		420 MB/s
Write
Avg. Sequential Write Speed 		336 MB/s +0% 335 MB/s
4K Read
Avg. 4K Random Read Speed 		30.5 MB/s Faster random read.
+14% 		26.7 MB/s
4K Write
Avg. 4K Random Write Speed 		81.6 MB/s 82.3 MB/s +1%
Mixed
Avg. Sequential Mixed IO Speed 		268 MB/s 288 MB/s Slightly faster mixed IO speed.
+7%
4K Mixed
Avg. 4K Random Mixed IO Speed 		35.9 MB/s 36.8 MB/s +3%
SusWrite
Avg. Sustained Write Speed 		286 MB/s Faster sustained write speed.
+13% 		253 MB/s
Peak Score 
+10%
Read
Peak Sequential Read Speed 		497 MB/s Slightly faster peak read speed.
+6% 		471 MB/s
Write
Peak Sequential Write Speed 		445 MB/s Faster peak write speed.
+25% 		355 MB/s
4K Read
Peak 4K Random Read Speed 		36.3 MB/s Faster peak random read.
+15% 		31.5 MB/s
4K Write
Peak 4K Random Write Speed 		113 MB/s 117 MB/s +4%
Mixed
Peak Sequential Mixed IO Speed 		331 MB/s +2% 323 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		44.1 MB/s 45.1 MB/s +2%
SusWrite
Peak Sequential Sustained Write 60s Average 		440 MB/s Faster peak sustained write speed.
+25% 		353 MB/s
Value & Sentiment 
+∞%
Market Share
Based on 75,658,602 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.01 % Insanely higher market share.
+∞% 		0 %
Value
Value For Money 		5.17 % 13.3 % Hugely better value.
+157%
User Rating
UBM User Rating 		54 % Slightly more popular.
+6% 		51 %
Price
Price (score) 		$150 $40 Much cheaper.
+73%
Nice To Haves 
+12%
Age
Newest 		138 Months 121 Months More recent.
+12%
DQ Read
Peak 4K-64Thread Read Speed 		376 MB/s 381 MB/s +1%
DQ Write
Peak 4K-64Thread Write Speed 		330 MB/s +0% 329 MB/s
AS-SSD Total
AS-SSD Total Score 		1,196 Pts +1% 1,181 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		155 MB/s 223 MB/s Much faster peak deep queue mixed IO.
+44%
ADQ Read
Avg. 4K-64Thread Read Speed 		332 MB/s Slightly faster deep queue read.
+7% 		310 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		245 MB/s 268 MB/s Slightly faster deep queue write.
+9%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		126 MB/s 175 MB/s Much faster deep queue mixed IO.
+39%
Specifications 
Capacity
Capacity 		128GB 128GB
Conclusion 
Average Bench 89.5%
Average Bench 85.6%
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The 128GB 840 Pro is a rock solid performer. On release, nearly a year and a half ago, the Pro smashed several speed records. Today, with sequential read/write speeds of 519/438 MBps, the Pro is still one of the fastest SSDs available. One of the Pro's top competitors is Samsungs own, newer 840 Evo. Looking at a raw synthetic speed comparison of the 128GB Pro and Evo is a little misleading. On the face of it the Pro only has a marginal lead over the Evo. This due to the fact that the Evo can only maintain its burst write speed for transfers of up to 3GB, the size of its SLC cache. The Pro on the other hand can sustain higher throughputs indefinitely. The Pro also utilizes MLC which is rated for far more erase cycles than the TLC used in the Evo. Server IO is often continuous and would quickly exhaust the 3GB cache on the Evo but for typical consumer use the Evo will remain within the SLC cache most of the time. [Feb '14 SSDrivePro]

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Solid State Drive Rankings (Price vs Performance) April 2024 SSD Rankings

Welcome to our 2.5" and M.2 SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]

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Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute

Welcome to our PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best value for money upgrades.

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How it works

  • - Download and run UserBenchmark
  • - CPU tests include: integer, floating and string
  • - GPU tests include: six 3D game simulations
  • - Drive tests include: read, write, sustained write and mixed IO
  • - RAM tests include: single/multi core bandwidth and latency
  • - SkillBench (space shooter) tests user input accuracy
  • - Reports are generated and presented on userbenchmark.com
  • - Identify the strongest components in your PC
  • - See speed test results from other users
  • - Compare your components to the current market leaders
  • - Explore your best upgrade options with a virtual PC build
  • - Compare your in-game FPS to other users with your hardware

 Frequently Asked Questions

Storage Devices FAQ
What is sustained sequential write speed?
What’s the difference between SLC, MLC and TLC?
What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
What’s the difference between NAND and V-NAND?
What is sequential write speed?
What is sequential read speed?
What is incompressible data?
What is queue depth?
Solid State Drives
What is the SSD value for money rating?
What is 4K 64 thread write speed?
Can CPU power saving states (C1,C2,C3) impact SSD speed?
What is the effective SSD speed index?
How is the AS SSD write score calculated?
How is the AS SSD read score calculated?
How is the AS SSD total score calculated?
ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-13600K $279Nvidia RTX 4060 $300Crucial MX500 250GB $40
Intel Core i5-12400F $134Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $184Nvidia RTX 4070 $409Samsung 860 Evo 250GB $52
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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