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Mercury Accelsior™
PCI Express Solid State Drive

Used | OWC Tested

No drivers* are required making Accelsior a simple
Plug and Play bootable solution.
1 Year OWC SSD Limited Warranty
One Of The Easiest Upgrades You Can Install
If you can install a memory module, you'll find adding this high-performance card into your desktop/tower machine a breeze. By utilizing the fastest data interface available in a Apple Mac® Pro or PC-the PCIe slot-Mercury Accelsior offers nearly 3x faster performance than a 3Gb/s SSD...and beyond even 6Gb/s SSDs!

Experience supercharged speeds up to 780MB/s read and 763MB/s write and stop waiting for I/O-intensive apps like Photoshop, Final Cut Pro, or Avid Pro Tools to render, capture or process. With up to 100K IOP/s, business critical applications are given an instant boost while Accelsior's extreme performance speed dramatically reduces game level-loading, object streaming, and save times for more play time and less waiting.

Mac and PC Bootable with No Driver* Setup
Bootable on PCs and the only Mac-bootable/supported PCIe SSD available, Mercury Accelsior delivers near instant startup and app launching. And with a driverless* setup, it's truly a Plug and Play, high-performance solution
A More Efficient & Reliable Computing Experience
Massively boosting data transfer rates is only one of the benefits to the Mercury Accelsior. With its SandForce Driven™ SSDs, you'll enjoy a more responsive and productive computing experience, cooler and quieter processing, and greater energy efficiency compared to standard hard drives. Those benefits don't come at the expense of reliability however; SandForce RAISE™ technology provides RAID-like data protection and reliability.
User Friendly, Professionally Robust
Simple enough for mainstream business use, yet robust enough for professional multimedia production environments, the OWC Mercury Accelsior is the clear choice for pro audio and video studios producing HD-quality work. This game changing performance upgrade is designed and built in the U.S. from domestic and imported parts and backed by a 1 Year OWC SSD Limited Warranty.
The Mercury SSD line features industry leading SandForce® DuraClass™ Technologies:
  • DuraWrite™ extends the endurance of your Solid State Drive (SSD).
  • Intelligent Block Management & Wear Leveling automatically distributes data evenly across the entire SSD.
  • Intelligent Read Disturb Management spreads the active read/write across the flash components eliminating data corruption caused by constant use.
  • Intelligent "Recycling" for advanced free space management gradually re-writes data across the SSD over time to ensure data never gets corrupted.
  • RAISE™ (Redundant Array of Independent Silicon Elements) protects the data on your drive similar to having a RAID setup.
  • Best-in-Class ECC Protection for longest data retention and drive life.
Accelsior Now Supports Sleep Mode!
We're pleased to offer this driver that enables Accelsior to be used as an OS X start-up/boot volume in a Mac Pro or Xserve.
Note about compatibility and throughput:
  • Compatibility:
    • Fully compatible with Mac Pros and PCs offering an available PCIe 2.0 x4 slot or better.
  • For full throughput on PCs:
    • PCIe 2.0 x4 slot or better is required. Use of a PCIe 1.0 x4 slot will reduce performance.
  • For full throughput on Mac Pros:
    • 2009-2010 Installing Accelsior into any open x4 or x16 PCIe 2.0 slot will deliver full throughput up to 785MB/s.
    • 2008 Mac Pros have two x16 PCIe 2.0 slots, which enable Acceslsior to deliver full throughput up to 785MB/s. Installing Accelsior into of the two x4 PCIe 1.0 slots will result in Accelsior being addressed as a gen one, one-lane card with performance limited to real world 190-200MB/s data rates.
    • 2006-2007 Mac Pros utilize PCIe 1.0 slot which cannot be configured (even with the Expansion Utility in OS X) to address Accelsior as anything but as a first generation one-lane card. As a result, Accelsior performance will be limited to 190-200MB/s data rates. If maximum data rate speed up to 285MB/s is desired, we recommend the installation of a 2.5" OWC Mercury SSD in an open Mac Pro drive bay.
Note: The use of two or more Accelsior SSDs requires OS X 10.6.8 or later.
Note: Bootcamp: 2008 Mac Pro (with model ID MacPro3,1) only supported in PCIe slots #3 & #4. All models: To boot Windows via Bootcamp on Accelsior, only one Accelsior SSD can be installed.
Note: 2006 - 2008 Mac Pros (model identifiers MacPro1,1; MacPro2,1; MacPro3,1): Due to an Apple limitation, any volume located on a Mercury Accelsior SSD will not appear in the "option boot" menu. A volume installed on an Accelsior can be set as the Mac Pro's boot volume through the "Startup Disk" pane in System Preferences.

This OWC SSD is compatible with: Learn how to find your Mac's model ID
Mac Pro
Mac Pro (Mid 2010 Quad-Core)
(July, 2010)
Model ID: MacPro5,1
2.8GHz, 3.2GHz, 3.33GHz
Mac Pro
Mac Pro 6-Core
(Mid 2010-2012)
(July, 2010 / June 2012)
Model ID: MacPro5,1
Mac Pro
Mac Pro 8-Core (Mid 2010)
(July, 2010)
Model ID: MacPro5,1
Mac Pro
Mac Pro 12-Core
(Mid 2010-2012)
(July, 2010 / June 2012)
Model ID: MacPro5,1
2.40GHz, 2.66GHz, 2.93GHz, 3.06GHz
Mac Pro
Mac Pro (Early 2009 Quad-Core)
(March, 2009)
Model ID: MacPro4,1
2.66GHz, 2.93GHz, 3.33GHz
Mac Pro
Mac Pro (Early 2009 8-Core)
(March, 2009)
Model ID: MacPro4,1
2.26GHz, 2.66GHz, 2.93GHz
Mac Pro
Mac Pro (Early 2008)
(January, 2008)
Model ID: MacPro3,1
2.8GHz, 3.0GHz, 3.2GHz
Mac Pro
Mac Pro (8-core)
(April, 2007)
Model ID: MacPro2,1
Mac Pro
Mac Pro
(August, 2006)
Model ID: MacPro1,1
2.0GHz, 2.66GHz, 3.0GHz
Xserve Intel
Xserve (Late 2006)
(August, 2006)
Model ID: Xserve1,1
dual 2.0GHz, dual 2.66GHz, dual 3.0GHz
Xserve Intel
Xserve (Early 2008)
(January, 2008)
Model ID: Xserve2,1
2.8GHz, dual 2.8GHz, dual 3.0GHz
Xserve Intel
Xserve Quad-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
Xserve Intel
Xserve 8-Core (Early 2009)
(April, 2009)
Model ID: Xserve3,1
2.26GHz, 2.66GHz, 2.93GHz
PC Desktop
PC Desktops
Compatible with Intel / AMD Process based PCs capable with the specifications listed above.
PC Servers
PCIe capable servers
Compatible with PCIe expandable servers with the specifications listed above.
HP DL 380 G7
HP DL 380 G7
Dell PowerEdge R620
Dell PowerEdge R620
Dell PowerEdge R620
Dell PowerEdge T620
Currently not supported for use in: Dell PowerEdge R620, T620 & HP DL 380 G7

Release Candidate (RC) firmware set

There are two kinds of firmware for SSDs Mass Production (MP) and Release Candidate (RC). Prior to an MP firmware release, there are beta firmware releases and an RC firmware release. Often, the RC is the same as the MP release, however there can be small changes and bug fixes made between the two. OWC has evaluated the RC for the 6Gb/s SandForce 2281 Processor and found it to be stable with no issues reported during our testing. However, as with any evolutionary product, issues may surface as different usages and configurations are employed and it is important to understand that there will be further updates and revisions.

Since no firmware update is currently offered for the OWC Mercury EXTREME Pro 6G SSD, no update page exists. To see the typical steps involved with a self performed field firmware update, please visit our 3Gb/s product update page at:

It is important to note that the current firmware update tool requires the use of Windows XP/Vista/7. OWC is currently working on a Mac OS based update tool, but we do not have an exact availability date.

480GB Mercury Accelsior PCI Express SSD Specifications:


Dual LSI® SandForce SF-228x 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
480GB useable capacity
Total Flash Memory Components - 512GB
32GB allocated to real-time data redundancy & error correction
Formatted Capacity2
SMART Attributes
Native Command Queuing
up to 32 commands
AHCI Compliant
Plug and Play installation, no drivers* required
Manufacturer Model Number
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 Warranty
(Standard return policy applies.)


Sustained Sandy Bridge
Reads (up to)
Sustained Sandy Bridge
Writes (up to)
Sustained Ivy Bridge
Reads (up to)
Sustained Ivy Bridge
Writes (up to)
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

Environmental (Operating)

Temperature (°F)
32°F to 158°F
Temperature (°C)
0°C to 70°C

Environmental (Non-Operating)

Temperature (°F)
-67°F to 302°F
Temperature (°C)
-55°C to 150°C


Idle (Typical)
0.0 bels
Seek (Typical)
0.0 bels

Operating System Compatibility5

Vista and higher
Server 2008 and higher
Mac OS X
10.6 and higher
Mac OS X Server
10.6 and higher
Ubuntu Linux
9.04 and higher
Fedora Linux
14 and higher


  1. 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences. 
  2. In terms of standard gigabytes, 1GiB ≈ 1.074GB and refers to the actual formatted capacity of shown under Mac OS 10.5 or earlier and Microsoft Windows OS.
  3. Specific application environments such as temperature and duty cycle will affect the overall reliability.
  4. Performance may vary by machine - see compatibility tab for details.
  5. The Mercury Accelsior E2 is not compatible with Bootcamp. To use Windows on a Mac with the Mercury Accelsior E2, you must boot to a Windows installer and install it directly onto the Mercury Accelsior E2.

Note: The use of two or more Accelsior SSDs requires OS X 10.6.8 or later.
Note: While using Windows with an Accelsior, only one Accelsior SSD can be installed.



Click any of the benchmarks below to view the results.
*Units shipped after 3/28/2016 no longer require OS X Driver. Download Driver for Mac only.
OWC 480GB Mercury Accelsior™ PCI Express Solid State Drive Mfr P/N: SSDPHW2R480 OWC SKU: OWUSSDPHW2R480U Hardware RAID Solid State Drive 90 Day OWC Limited Warranty Ships: Same Day
Supply Limited: 1 available
Only $549.00Garage Sale Price $199.75
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