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SamsungMZ-7TE250BW
CrucialCT256M550SSD1
$152
▲ 5335,450 ▼

Controller: Samsung 3 Core MEX. Memory: Samsung 19nm Toggle Mode TLC. Release date: Q3 2013.

VS
▲ 527,484 ▼
 $152 

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

Effective Speed 
+6%
Real World Speed
Performance profile from 225,448 user samples
Benchmark your SSD here
217,115 User Benchmarks
Best Bench: 118% 68GB free
Worst Bench: 64% 231GB free
Poor: 64% Great: 118%
SPEED RANK: 284th / 1080
8,333 User Benchmarks
Best Bench: 113% 106GB free
Worst Bench: 60% 231GB free
Poor: 60% Great: 113%
SPEED RANK: 328th / 1080
Effective Speed
Effective SSD Speed 		95.9 % Slightly faster effective speed.
+6% 		90.5 %
Average Score 
+5%
Read
Avg. Sequential Read Speed 		465 MB/s Faster read speed.
+11% 		418 MB/s
Write
Avg. Sequential Write Speed 		394 MB/s 416 MB/s Slightly faster write speed.
+6%
4K Read
Avg. 4K Random Read Speed 		38.8 MB/s Much faster random read.
+43% 		27.1 MB/s
4K Write
Avg. 4K Random Write Speed 		85.3 MB/s +0% 85 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		347 MB/s Faster mixed IO speed.
+16% 		299 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		48 MB/s Faster random mixed IO.
+27% 		37.9 MB/s
SusWrite
Avg. Sustained Write Speed 		195 MB/s 311 MB/s Much faster sustained write speed.
+59%
Peak Score 
+9%
Read
Peak Sequential Read Speed 		507 MB/s Slightly faster peak read speed.
+9% 		466 MB/s
Write
Peak Sequential Write Speed 		489 MB/s +4% 470 MB/s
4K Read
Peak 4K Random Read Speed 		46.7 MB/s Much faster peak random read.
+46% 		31.9 MB/s
4K Write
Peak 4K Random Write Speed 		119 MB/s +1% 118 MB/s
Mixed
Peak Sequential Mixed IO Speed 		418 MB/s Faster peak mixed IO speed.
+26% 		333 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		59.8 MB/s Faster peak random mixed IO.
+29% 		46.4 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		299 MB/s 459 MB/s Much faster peak sustained write speed.
+54%
Value & Sentiment 
+420%
Market Share
Based on 77,607,762 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.17 % Insanely higher market share.
+1,600% 		0.01 %
Value
Value For Money 		12.5 % Much better value.
+44% 		8.68 %
User Rating
UBM User Rating 		53 % +2% 52 %
Price
Price (score) 		$99 Much cheaper.
+35% 		$152
Nice To Haves 
+1%
Age
Newest 		136 Months 128 Months Slightly more recent.
+6%
DQ Read
Peak 4K-64Thread Read Speed 		383 MB/s 387 MB/s +1%
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s +0% 361 MB/s
AS-SSD Total
AS-SSD Total Score 		1,273 Pts +3% 1,240 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		237 MB/s 240 MB/s +1%
ADQ Read
Avg. 4K-64Thread Read Speed 		337 MB/s Slightly faster deep queue read.
+8% 		311 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		293 MB/s +4% 282 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		203 MB/s +1% 201 MB/s
Specifications 
Capacity
Capacity 		250GB 256GB
Conclusion 
Average Bench 95.9%
Average Bench 90.5%

The Evo is remarkable in that, like the Sandisk Extreme II, it features a second level cache. For the 250 GB Evo this consists of a 3 GB Turbowrite cache (TWC) which is a block of high speed Flash Memory. When the TWC is exhausted write speeds drop by approximately 50% but that won't often happen under typical consumer workloads. In terms of raw performance, even with its cache, the Evo still isn't the fastest drive. With a real world speed index reading of 439 MB/s the EVO is however, within reach of the two speed leaders (Vector and 850 Pro). At a price point of $130 the Evo is around 30% cheaper making it the best value for money SSDs I have seen in 2014. Comparing the Evo and the Sandisk Ultra Plus shows that the Evo is the winner but the Sandisk may be a viable alternative thanks to its cache-free, and therefore more consistent performance during extended writes. [Aug '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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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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 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?
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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 i5-12600K $155Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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