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CrucialCT1024M550SSD1
CrucialCT256M550SSD1
$152
▲ 500 ▼

Controller: Marvell 88SS9189. Flash Memory: Micron Synchronous 20nm MLC. Release date ≤ Q2 2014.

VS
▲ 527,484 ▼
 $152 

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

Effective Speed 
+0%
Real World Speed
Performance profile from 9,961 user samples
Benchmark your SSD here
1,628 User Benchmarks
Best Bench: 109% 265GB free
Worst Bench: 66% 125GB free
Poor: 66% Great: 109%
SPEED RANK: 331st / 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 		90.4 % 90.5 % +0%
Average Score 
+1%
Read
Avg. Sequential Read Speed 		411 MB/s 418 MB/s +2%
Write
Avg. Sequential Write Speed 		420 MB/s +1% 416 MB/s
4K Read
Avg. 4K Random Read Speed 		25.6 MB/s 27.1 MB/s Slightly faster random read.
+6%
4K Write
Avg. 4K Random Write Speed 		81.5 MB/s 85 MB/s +4%
Mixed
Avg. Sequential Mixed IO Speed 		290 MB/s 299 MB/s +3%
4K Mixed
Avg. 4K Random Mixed IO Speed 		36.1 MB/s 37.9 MB/s +5%
SusWrite
Avg. Sustained Write Speed 		353 MB/s Faster sustained write speed.
+14% 		311 MB/s
Peak Score 
+2%
Read
Peak Sequential Read Speed 		459 MB/s 466 MB/s +2%
Write
Peak Sequential Write Speed 		474 MB/s +1% 470 MB/s
4K Read
Peak 4K Random Read Speed 		29.9 MB/s 31.9 MB/s Slightly faster peak random read.
+7%
4K Write
Peak 4K Random Write Speed 		117 MB/s 118 MB/s +1%
Mixed
Peak Sequential Mixed IO Speed 		318 MB/s 333 MB/s +5%
4K Mixed
Peak 4K Random Mixed IO Speed 		44.4 MB/s 46.4 MB/s +5%
SusWrite
Peak Sequential Sustained Write 60s Average 		467 MB/s +2% 459 MB/s
Value & Sentiment 
+∞%
Market Share
Based on 77,542,094 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0 % 0.02 % Insanely higher market share.
+∞%
Value
Value For Money 		7.82 % 8.68 % Better value.
+11%
User Rating
UBM User Rating 		50 % 52 % +4%
Price
Price (score) 		$700 $152 Much cheaper.
+78%
Nice To Haves 
+0%
Age
Newest 		127+ Months 127 Months
DQ Read
Peak 4K-64Thread Read Speed 		391 MB/s +1% 387 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		362 MB/s +0% 361 MB/s
AS-SSD Total
AS-SSD Total Score 		1,242 Pts +0% 1,240 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		239 MB/s 240 MB/s +0%
ADQ Read
Avg. 4K-64Thread Read Speed 		300 MB/s 311 MB/s +4%
ADQ Write
Avg. 4K-64Thread Write Speed 		278 MB/s 282 MB/s +1%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		205 MB/s +2% 201 MB/s
Specifications 
Capacity
Capacity 		1TB 256GB
Conclusion 
Average Bench 90.4%
Average Bench 90.5%

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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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?
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?
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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
CPUGPUSSD
Intel Core i5-12600K $159Nvidia RTX 4060 $280WD Black SN850X M.2 2TB $135
Intel Core i5-13600K $210Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $84
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $370
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