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KingstonSKC300S37A/60G
CrucialCT256M550SSD1
$152
▲ 500 ▼

Controller: SandForce SF2281. Flash Memory: Toshiba 19nm Toggle Mode. Release date ≤ Q2 2014.

VS
▲ 527,484 ▼
 $152 

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

Effective Speed 
+38%
Real World Speed
Performance profile from 9,008 user samples
Benchmark your SSD here
675 User Benchmarks
Best Bench: 79% 39GB free
Worst Bench: 51% 44GB free (System drive)
Poor: 51% Great: 79%
SPEED RANK: 745th / 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 		65.6 % 90.5 % Much faster effective speed.
+38%
Average Score 
+77%
Read
Avg. Sequential Read Speed 		364 MB/s 418 MB/s Faster read speed.
+15%
Write
Avg. Sequential Write Speed 		126 MB/s 416 MB/s Hugely faster write speed.
+230%
4K Read
Avg. 4K Random Read Speed 		28.9 MB/s Slightly faster random read.
+7% 		27.1 MB/s
4K Write
Avg. 4K Random Write Speed 		72.6 MB/s 85 MB/s Faster random write.
+17%
Mixed
Avg. Sequential Mixed IO Speed 		175 MB/s 299 MB/s Much faster mixed IO speed.
+71%
4K Mixed
Avg. 4K Random Mixed IO Speed 		35.3 MB/s 37.9 MB/s Slightly faster random mixed IO.
+7%
SusWrite
Avg. Sustained Write Speed 		102 MB/s 311 MB/s Hugely faster sustained write speed.
+205%
Peak Score 
+86%
Read
Peak Sequential Read Speed 		434 MB/s 466 MB/s Slightly faster peak read speed.
+7%
Write
Peak Sequential Write Speed 		137 MB/s 470 MB/s Hugely faster peak write speed.
+243%
4K Read
Peak 4K Random Read Speed 		36.7 MB/s Faster peak random read.
+15% 		31.9 MB/s
4K Write
Peak 4K Random Write Speed 		110 MB/s 118 MB/s Slightly faster peak random write.
+7%
Mixed
Peak Sequential Mixed IO Speed 		197 MB/s 333 MB/s Much faster peak mixed IO speed.
+69%
4K Mixed
Peak 4K Random Mixed IO Speed 		45.2 MB/s 46.4 MB/s +3%
SusWrite
Peak Sequential Sustained Write 60s Average 		119 MB/s 459 MB/s Hugely faster peak sustained write speed.
+286%
Value & Sentiment 
+∞%
Market Share
Based on 76,253,897 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0 % 0.01 % Insanely higher market share.
+∞%
Value
Value For Money 		4.48 % 8.68 % Hugely better value.
+94%
User Rating
UBM User Rating 		50 % 52 % +4%
Price
Price (score) 		$56 Much cheaper.
+63% 		$152
Nice To Haves 
+112%
Age
Newest 		121+ Months +2% 123 Months
DQ Read
Peak 4K-64Thread Read Speed 		141 MB/s 387 MB/s Hugely faster peak deep queue read.
+174%
DQ Write
Peak 4K-64Thread Write Speed 		138 MB/s 361 MB/s Hugely faster peak deep queue write.
+162%
AS-SSD Total
AS-SSD Total Score 		597 Pts 1,240 Pts Hugely stronger server IO.
+108%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		134 MB/s 240 MB/s Much faster peak deep queue mixed IO.
+79%
ADQ Read
Avg. 4K-64Thread Read Speed 		120 MB/s 311 MB/s Hugely faster deep queue read.
+159%
ADQ Write
Avg. 4K-64Thread Write Speed 		123 MB/s 282 MB/s Hugely faster deep queue write.
+129%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		109 MB/s 201 MB/s Hugely faster deep queue mixed IO.
+84%
Specifications 
Capacity
Capacity 		60GB 256GB
Conclusion 
Average Bench 65.6%
Average Bench 90.5%
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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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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?
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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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