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CrucialCT256M550SSD1
$152
Apple
▲ 527,484 ▼
 $152 

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

VS
▲ 507 ▼
  

Release date ≤ Q4 2013.

Effective Speed 
+34%
Real World Speed
Performance profile from 9,183 user samples
Benchmark your SSD here
8,333 User Benchmarks
Best Bench: 113% 106GB free
Worst Bench: 60% 231GB free
Poor: 60% Great: 113%
SPEED RANK: 328th / 1080
850 User Benchmarks
Best Bench: 97% 232GB free
Worst Bench: 50% 163GB free (System drive)
Poor: 50% Great: 97%
SPEED RANK: 715th / 1080
Effective Speed
Effective SSD Speed 		90.5 % Much faster effective speed.
+34% 		67.4 %
Average Score 
+38%
Read
Avg. Sequential Read Speed 		418 MB/s +2% 408 MB/s
Write
Avg. Sequential Write Speed 		416 MB/s Faster write speed.
+30% 		321 MB/s
4K Read
Avg. 4K Random Read Speed 		27.1 MB/s Much faster random read.
+56% 		17.4 MB/s
4K Write
Avg. 4K Random Write Speed 		85 MB/s Hugely faster random write.
+80% 		47.1 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		299 MB/s Faster mixed IO speed.
+17% 		255 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		37.9 MB/s Much faster random mixed IO.
+76% 		21.5 MB/s
SusWrite
Avg. Sustained Write Speed 		311 MB/s +3% 302 MB/s
Peak Score 
+12%
Read
Peak Sequential Read Speed 		466 MB/s 483 MB/s +4%
Write
Peak Sequential Write Speed 		470 MB/s Faster peak write speed.
+15% 		407 MB/s
4K Read
Peak 4K Random Read Speed 		31.9 MB/s +1% 31.5 MB/s
4K Write
Peak 4K Random Write Speed 		118 MB/s Much faster peak random write.
+37% 		86.3 MB/s
Mixed
Peak Sequential Mixed IO Speed 		333 MB/s +4% 321 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		46.4 MB/s Faster peak random mixed IO.
+19% 		39 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		459 MB/s Faster peak sustained write speed.
+13% 		405 MB/s
Value & Sentiment 
+∞%
Market Share
Based on 76,244,044 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.01 % Insanely higher market share.
+∞% 		0 %
User Rating
UBM User Rating 		52 % +4% 50 %
Nice To Haves 
+41%
Age
Newest 		123 Months +2% 126+ Months
DQ Read
Peak 4K-64Thread Read Speed 		387 MB/s +2% 381 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		361 MB/s Much faster peak deep queue write.
+42% 		255 MB/s
AS-SSD Total
AS-SSD Total Score 		1,240 Pts Stronger server IO.
+14% 		1,085 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		240 MB/s Much faster peak deep queue mixed IO.
+57% 		153 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		311 MB/s Faster deep queue read.
+19% 		261 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		282 MB/s Hugely faster deep queue write.
+141% 		117 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		201 MB/s Much faster deep queue mixed IO.
+48% 		136 MB/s
Specifications 
Capacity
Capacity 		256GB 251GB
Conclusion 
Average Bench 90.5%
Average Bench 67.4%
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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]

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