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Thanks McKnife, thought so.
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We are installing HP DL380 Gen9 servers with HP Smart Array P440ar contollers and SED drives that conform to the TCG Opal v2.0 standard, compatible with the Microsoft eDrive IEEE 1667 protocol.<br />
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We plan to use Server 2012 BitLocker to secure data at rest. According to BitLocker literature, the 2012 implementation uses SED drive hardware to accelerate drive encryption and also that BitLocker works with hardware RAID arrays. I can find no information that indicates whether BitLocker can use [take advantage of] SED hardware to accelerate encryption on drives connected to an array controller configured in RAID [10] or not. <br />
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Can BitLocker use SED hardware to accelerate encryption on drives connected to an array controller configured in RAID [10]?
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We are installing HP DL380 Gen9 servers with HP Smart Array P440ar contollers and SED drives that conform to the TCG Opal v2.0 standard, compatible with the Microsoft eDrive IEEE 1667 protocol.

We plan to use Server 2012 BitLocker to secure data at rest. According to BitLocker literature, the 2012 implementation uses SED drive hardware to accelerate drive encryption and also that BitLocker works with hardware RAID arrays. I can find no information that indicates whether BitLocker can use [take advantage of] SED hardware to accelerate encryption on drives connected to an array controller configured in RAID [10] or not. 

Can BitLocker use SED hardware to accelerate encryption on drives connected to an array controller configured in RAID [10]?

Self-Encrypting Drives (SED) with Array Controller RAID and BitLocker

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.