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SamsungMZ-75E250B
CrucialCT256M550SSD1
$152
▲ 5640,704 ▼

Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND. Release date: Q4 2014.

VS
▲ 527,484 ▼
 $152 

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

Effective Speed 
+14%
Real World Speed
Performance profile from 959,924 user samples
Benchmark your SSD here
951,591 User Benchmarks
Best Bench: 124% 140GB free
Worst Bench: 72% 233GB free
Poor: 72% Great: 124%
SPEED RANK: 251st / 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 		103 % Faster effective speed.
+14% 		90.5 %
Average Score 
+15%
Read
Avg. Sequential Read Speed 		466 MB/s Faster read speed.
+11% 		418 MB/s
Write
Avg. Sequential Write Speed 		434 MB/s +4% 416 MB/s
4K Read
Avg. 4K Random Read Speed 		39.4 MB/s Much faster random read.
+45% 		27.1 MB/s
4K Write
Avg. 4K Random Write Speed 		94.6 MB/s Faster random write.
+11% 		85 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		370 MB/s Faster mixed IO speed.
+24% 		299 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		52.2 MB/s Much faster random mixed IO.
+38% 		37.9 MB/s
SusWrite
Avg. Sustained Write Speed 		247 MB/s 311 MB/s Faster sustained write speed.
+26%
Peak Score 
+14%
Read
Peak Sequential Read Speed 		507 MB/s Slightly faster peak read speed.
+9% 		466 MB/s
Write
Peak Sequential Write Speed 		492 MB/s +5% 470 MB/s
4K Read
Peak 4K Random Read Speed 		47.6 MB/s Much faster peak random read.
+49% 		31.9 MB/s
4K Write
Peak 4K Random Write Speed 		129 MB/s Slightly faster peak random write.
+9% 		118 MB/s
Mixed
Peak Sequential Mixed IO Speed 		416 MB/s Faster peak mixed IO speed.
+25% 		333 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		64.6 MB/s Much faster peak random mixed IO.
+39% 		46.4 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		328 MB/s 459 MB/s Much faster peak sustained write speed.
+40%
Value & Sentiment 
+1,749%
Market Share
Based on 77,607,474 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.7 % Insanely higher market share.
+6,900% 		0.01 %
Value
Value For Money 		13.4 % Much better value.
+54% 		8.68 %
User Rating
UBM User Rating 		56 % Slightly more popular.
+8% 		52 %
Price
Price (score) 		$100 Much cheaper.
+34% 		$152
Nice To Haves 
+18%
Age
Newest 		119 Months Slightly more recent.
+7% 		128 Months
DQ Read
Peak 4K-64Thread Read Speed 		386 MB/s 387 MB/s +0%
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s +0% 361 MB/s
AS-SSD Total
AS-SSD Total Score 		1,290 Pts +4% 1,240 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		370 MB/s Much faster peak deep queue mixed IO.
+54% 		240 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s Faster deep queue read.
+14% 		311 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		308 MB/s Slightly faster deep queue write.
+9% 		282 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		320 MB/s Much faster deep queue mixed IO.
+59% 		201 MB/s
Specifications 
Capacity
Capacity 		250GB 256GB
Conclusion 
Average Bench 103%
Average Bench 90.5%

The 250GB Samsung 850 Evo has a similar architecture to its hugely successful predecessor, the 840 Evo. Both drives are TLC based but the 850 uses 3D V-NAND as opposed to regular NAND. Both drives also feature a Turbowrite cache (TWC) which buffers up to 3GB of writes. The TWC enables high burst write speeds but when the cache exhausts write speeds drop to 300 MB/s. Comparing the 850 and 840 Evos shows that effective speed, has improved by 11% and the warranty has been extended from three to five years but prices are also up by 11%. The 850 Evo does put in superb benchmarks (second only to the 850 Pro) but these are only valid within the TWC. At current price levels the 850 Evo struggles to compete with the value leaders. [Dec '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
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Solid State Drives
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Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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