OWC Mercury Accelsior E2
Dual LSI® SandForce SF-2281 series processors with 7% Over Provisioning
Tier 1 Major Multi-Level Cell (MLC) High-Performance Sync-NAND Flash
Form Factor
Low Profile PCI Express
PCIe 2.0 x2
Expansion Ports
Two eSATA 6Gb/s ports, also backward compatible with 1.5Gb/s and 3Gb/s equipped eSATA storage solutions1
SMART Attribute
Native Command Queuing
up to 32 commands
AHCI Compliant
Plug and Play installation
no drivers required5
RoHS Compliant
Height (max)
120mm (4.74″)
Width (max)
20.7mm (0.81″)
Length (max)
180mm (7.1″)
85 grams +/- 4 grams
0.18 lbs +/- 3.0 oz
Data Reliability
ECC Recovery: Up to 55 bytes correctable per 512-byte sector
Chip Based Data Encryption: 128-bit AES-compliant
3 Year OWC SSD Limited Warranty
(Standard return policy applies.)
Sustained Sandy Bridge PC Reads
(up to) 780MB/s
Sustained Sandy Bridge PC Writes
(up to) 763MB/s
Sustained Ivy Bridge PC Reads
(up to) 823MB/s
Sustained Ivy Bridge PC Writes
(up to) 783MB/s
Sustained Mac Pro Reads
(up to) 678MB/s
Sustained Mac Pro Writes
(up to) 688MB/s
Random 4K Read
Up to 100,000 IOPS
Random 4K Write
Up to 100,000 IOPS
Write Latency
Less than 0.1ms
Read Latency
Less than 0.1ms
Idle (Typical)
0.0 bels
Seek (Typical)
0.0 bels
Qualified and Supported Solutions:
Oxford 924
NewerTech miniStack V3
Oxford 934
OWC Mercury Elite Pro Classic–Prev.
Oxford 936
OWC Mercury Elite Pro Dual–Prev.
OWC Mercury Elite Pro Dual Mini–Prev.
OWC Mercury Elite Pro Qx2
NewerTech Guardian MAXimus Mini
JMicron 355
All solutions with both
  1. Only eSATA ports
  2. One drive per port
Such as
OWC Mercury Elite Pro RAID Ready
Not recommended due to sleep limitation:
Oxford 944
Oxford 946
Temperature (°F)
32°F to 158°F
Temperature (°C)
0°C to 70°C
Temperature (°F)
-67°F to 302°F
Temperature (°C)
-55°C to 150°C
Mac OS X
10.6 and higher
Mac OS X Server
10.6 and higher
Vista and higher
Server 2008 and higher
Ubuntu Linux
9.04 and higher
Fedora Linux
14 and higher
Required for Accelsior E2 SSDs purchased before 3/24/2016
Driver for Apple Mac Pro
  1. Not compatible with port-multiplier enclosures.
  2. Specific application environments such as temperature and duty cycle will affect the overall reliability.
  3. Performance may vary by machine - see compatibility tab for details.
  4. Driver ensures proper power-down of Accelsior E2 during sleep and shutdown actions, this driver does not interact with the data operation and ensures that OS X provides proper power down notification to the Accelsior E2 where without the driver such notification may not occur.
  5. A sleep conflict may be encountered when using certain eSATA chipsets via the eSATA ports when booted to the Accelsior E2. See the specifications tab for affected solutions where System Sleep mode MUST be disabled in order to ensure reliable operation. Allowing system sleep to occur while one of the affected external drives is connected via the Accelsior E2 eSATA ports could result in loss of data following wake from sleep. Although the above are our general recommendations for use, wake from sleep has been determined to only be an issue when the Accelsior PCIe is used for startup (SSD or eSATA connected device). We are working with our partners to see that the sleep/wake function is fully supported with all solutions and startup scenarios.
  • Dual Accelsior_E2 Usage. The use of two or more Accelsior_E2 SSDs requires OS X 10.6.8 or later.
  • OWC Dual Boot Enabler for Apple Boot Camp required for use with Boot Camp utility. Download here.
Mercury Accelsior, Mercury Elite and Mercury Rack are trademarks of New Concepts Development Corporation. Guardian MAXimus and NewerTech are trademarks of Newer Technology, Inc., registered in the U.S. Patent and Trademark Office. miniStack is a trademark of Newer Technology, Inc., registered in the U.S. Patent and Trademark Office and Canada. Apple, Mac, Mac Pro, and OS X are trademarks of Apple Inc., registered in the U.S. and other countries. LSI and SandForce are trademarks of LSI Corporation in the U.S. and/or other countries. Other marks may be the trademark or registered trademark property of their owners.