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PlextorPX-128M5P
CrucialCT256M550SSD1
$152
▲ 52770 ▼

Controller: Marvell 88SS9187-BLD2. NAND Memory: Toshiba 19nm Toggle Mode MLC. Release date: Q3 2012.

VS
▲ 527,484 ▼
 $152 

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

Effective Speed 
+8%
Real World Speed
Performance profile from 12,809 user samples
Benchmark your SSD here
4,476 User Benchmarks
Best Bench: 98% 64GB free
Worst Bench: 63% 14GB free
Poor: 63% Great: 98%
SPEED RANK: 428th / 1071
8,333 User Benchmarks
Best Bench: 113% 106GB free
Worst Bench: 60% 231GB free
Poor: 60% Great: 113%
SPEED RANK: 320th / 1071
Effective Speed
Effective SSD Speed 		83.8 % 90.5 % Slightly faster effective speed.
+8%
Average Score 
+15%
Read
Avg. Sequential Read Speed 		451 MB/s Slightly faster read speed.
+8% 		418 MB/s
Write
Avg. Sequential Write Speed 		305 MB/s 416 MB/s Much faster write speed.
+36%
4K Read
Avg. 4K Random Read Speed 		27.8 MB/s +3% 27.1 MB/s
4K Write
Avg. 4K Random Write Speed 		63.1 MB/s 85 MB/s Much faster random write.
+35%
Mixed
Avg. Sequential Mixed IO Speed 		259 MB/s 299 MB/s Faster mixed IO speed.
+15%
4K Mixed
Avg. 4K Random Mixed IO Speed 		32.3 MB/s 37.9 MB/s Faster random mixed IO.
+17%
SusWrite
Avg. Sustained Write Speed 		284 MB/s 311 MB/s Slightly faster sustained write speed.
+10%
Peak Score 
+19%
Read
Peak Sequential Read Speed 		499 MB/s Slightly faster peak read speed.
+7% 		466 MB/s
Write
Peak Sequential Write Speed 		325 MB/s 470 MB/s Much faster peak write speed.
+45%
4K Read
Peak 4K Random Read Speed 		34.2 MB/s Slightly faster peak random read.
+7% 		31.9 MB/s
4K Write
Peak 4K Random Write Speed 		89.2 MB/s 118 MB/s Much faster peak random write.
+32%
Mixed
Peak Sequential Mixed IO Speed 		292 MB/s 333 MB/s Faster peak mixed IO speed.
+14%
4K Mixed
Peak 4K Random Mixed IO Speed 		41.4 MB/s 46.4 MB/s Faster peak random mixed IO.
+12%
SusWrite
Peak Sequential Sustained Write 60s Average 		317 MB/s 459 MB/s Much faster peak sustained write speed.
+45%
Value & Sentiment 
�%
Market Share
Based on 75,841,930 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0 % 0 %
Value
Value For Money 		5.38 % 8.68 % Much better value.
+61%
User Rating
UBM User Rating 		52 % 52 %
Price
Price (score) 		$130 Cheaper.
+15% 		$152
Nice To Haves 
+10%
Age
Newest 		140 Months 121 Months More recent.
+14%
DQ Read
Peak 4K-64Thread Read Speed 		360 MB/s 387 MB/s Slightly faster peak deep queue read.
+8%
DQ Write
Peak 4K-64Thread Write Speed 		314 MB/s 361 MB/s Faster peak deep queue write.
+15%
AS-SSD Total
AS-SSD Total Score 		1,110 Pts 1,240 Pts Stronger server IO.
+12%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		213 MB/s 240 MB/s Faster peak deep queue mixed IO.
+13%
ADQ Read
Avg. 4K-64Thread Read Speed 		305 MB/s 311 MB/s +2%
ADQ Write
Avg. 4K-64Thread Write Speed 		258 MB/s 282 MB/s Slightly faster deep queue write.
+9%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		180 MB/s 201 MB/s Faster deep queue mixed IO.
+12%
Specifications 
Capacity
Capacity 		128GB 256GB
Conclusion 
Average Bench 83.8%
Average Bench 90.5%
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The 128GB Plextor M5 Pro has a reasonable performance profile. With an effective speed of 442 MB/s it ranks just 5% below the average of the top ten user rated 128GB SSDs, a good result. The M5 Pro's server orientated deep queue read/write speeds clocked in at 345/282 MB/s, slightly above average. As a consequence of having fewer NAND modules, the 128GB version is around 40% slower at sequential writing than its 256GB sibling. The larger capacity M5 Pro represents significantly better value for money. In the 128GB category some manufacturers (Samsung/OCZ) are offering the same sorts of speeds as typically seen in the faster 256GB category. In terms of performance, those SSDs currently stand heads and shoulders above the rest of the 128GB pack. There are several better value for money alternatives to the 128GB M5 Pro in the group test. [Feb '14 SSDrivePro]

MORE DETAILS

The 256GB Crucial M550 is a welcome improvement over the 240GB M500. The new Marvel 88SS9189 controller has addressed our primary concern with the M500 which was poor sequential write speed. With sequential read/write speeds of 510/478 MB/s the M550 has a healthy core performance profile. Comparing the M550 and M500 shows that the new M550 leads on nearly every single performance metric. Unfortunately the M550 is priced significantly higher than the M500 but prices will likely drop as retailers build up stocks of the new M550. A key comparable for the M550 is the similarly priced market leading Samsung Evo. Comparing the Evo and M550 shows that the Evo is around 11% slower in terms of effective speed. [Mar '14 SSDrivePro]

MORE DETAILS

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Solid State Drive Rankings (Price vs Performance) May 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 $254Nvidia RTX 4060 $300Crucial MX500 250GB $39
Intel Core i5-12400F $133Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $175Nvidia RTX 4070 $550Samsung 860 Evo 250GB $52
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $45SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $45SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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