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SamsungMZ-7PD256BW
CrucialCT120BX100SSD1
▲ 5420,557 ▼

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

VS
▲ 52340 ▼

Controller: Silicon Motion SM2246EN. Flash Memory: Micron 16nm MLC. Release date: Q1 2015.

Effective Speed 
+25%
Real World Speed
Performance profile from 80,050 user samples
Benchmark your SSD here
73,119 User Benchmarks
Best Bench: 116% 238GB free
Worst Bench: 68% 11GB free (System drive)
Poor: 68% Great: 116%
SPEED RANK: 287th / 1080
6,931 User Benchmarks
Best Bench: 89% 0GB free (System drive)
Worst Bench: 56% 112GB free
Poor: 56% Great: 89%
SPEED RANK: 559th / 1080
Effective Speed
Effective SSD Speed 		95 % Faster effective speed.
+25% 		76.2 %
Average Score 
+39%
Read
Avg. Sequential Read Speed 		459 MB/s 475 MB/s +3%
Write
Avg. Sequential Write Speed 		367 MB/s Hugely faster write speed.
+103% 		181 MB/s
4K Read
Avg. 4K Random Read Speed 		31 MB/s Faster random read.
+18% 		26.3 MB/s
4K Write
Avg. 4K Random Write Speed 		85.6 MB/s Faster random write.
+12% 		76.4 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		303 MB/s Much faster mixed IO speed.
+34% 		226 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		39.5 MB/s Faster random mixed IO.
+15% 		34.3 MB/s
SusWrite
Avg. Sustained Write Speed 		312 MB/s Hugely faster sustained write speed.
+97% 		158 MB/s
Peak Score 
+56%
Read
Peak Sequential Read Speed 		510 MB/s 515 MB/s +1%
Write
Peak Sequential Write Speed 		480 MB/s Hugely faster peak write speed.
+155% 		188 MB/s
4K Read
Peak 4K Random Read Speed 		36.1 MB/s Faster peak random read.
+16% 		31 MB/s
4K Write
Peak 4K Random Write Speed 		114 MB/s +4% 110 MB/s
Mixed
Peak Sequential Mixed IO Speed 		368 MB/s Much faster peak mixed IO speed.
+50% 		246 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		47.6 MB/s Faster peak random mixed IO.
+12% 		42.6 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		477 MB/s Hugely faster peak sustained write speed.
+158% 		185 MB/s
Value & Sentiment 
+89%
Market Share
Based on 77,606,585 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.05 % Hugely higher market share.
+400% 		0.01 %
Value
Value For Money 		8.21 % Better value.
+11% 		7.42 %
User Rating
UBM User Rating 		54 % +4% 52 %
Price
Price (score) 		$175 $70 Much cheaper.
+60%
Nice To Haves 
+30%
Age
Newest 		145 Months 118 Months More recent.
+19%
DQ Read
Peak 4K-64Thread Read Speed 		385 MB/s Much faster peak deep queue read.
+46% 		263 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		334 MB/s Much faster peak deep queue write.
+78% 		188 MB/s
AS-SSD Total
AS-SSD Total Score 		1,221 Pts Much stronger server IO.
+46% 		834 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		176 MB/s +1% 174 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		346 MB/s Much faster deep queue read.
+41% 		245 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		262 MB/s Much faster deep queue write.
+53% 		171 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		147 MB/s 154 MB/s +5%
Specifications 
Capacity
Capacity 		256GB 120GB
Conclusion 
Average Bench 95%
Average Bench 76.2%

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]

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Welcome to our 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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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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 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?
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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?
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Brands make boatloads on flagships like the 4090 and 14900KS. We help users get similar real-world performance for less money.
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The Best
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Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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