The ULLtraDIMM is a

solid state storage A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit assemblies to store data persistently, typically using flash memory, and functioning as secondary storage in the hierarchy of computer storage. It is a ...

device from

SanDisk SanDisk is a brand for flash memory products, including memory cards and readers, USB flash drives, solid-state drives, and digital audio players, manufactured and marketed by Western Digital. The original company, SanDisk Corporation was acquire ...

that connects

flash storage Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use ...

directly onto the

DDR3 Double Data Rate 3 Synchronous Dynamic Random-Access Memory (DDR3 SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) with a high bandwidth ("double data rate") interface, and has been in use since 2007. It is the higher-speed ...

memory bus. Unlike traditional

PCIe PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e, is a high-speed serial computer expansion bus standard, designed to replace the older PCI, PCI-X and AGP bus standards. It is the common mo ...

Flash Storage devices, the ULLtraDIMM is plugged directly into an industry standard RDIMM

memory bus In computer architecture, a bus (shortened form of the Latin '' omnibus'', and historically also called data highway or databus) is a communication system that transfers data between components inside a computer, or between computers. This ex ...

slot in a

server Server may refer to: Computing *Server (computing), a computer program or a device that provides functionality for other programs or devices, called clients Role * Waiting staff, those who work at a restaurant or a bar attending customers and su ...

. This design and connection location provides deterministic (consistent) known latency to enable applications to be streamlined for improved performance. The ULLtraDIMM is compatible with the

JEDEC The JEDEC Solid State Technology Association is an independent semiconductor engineering trade organization and standardization body headquartered in Arlington County, Virginia, United States. JEDEC has over 300 members, including some of the w ...

MO-269

RDIMM specification. The ULLtraDIMM supports support both 1.35 V and 1.5 V operation from 800–1333 MHz, and 1.5 V @ 1600 MHz DDR3 transfer rates. DDR3 ECC bits are used to verify the integrity of the data being sent across

. The ULLtraDIMM will verify that correct ECC is received and, if there are errors, the device driver will re-run the transfer. The CPU treats the ECC from the ULLtraDIMM in the same manner as ECC from a memory

DIMM A DIMM () (Dual In-line Memory Module), commonly called a RAM stick, comprises a series of dynamic random-access memory integrated circuits. These memory modules are mounted on a printed circuit board and designed for use in personal compute ...

, single symbol errors are corrected. The

ECC bits are not stored in the flash array. A separate ECC scheme is used for protecting data in the flash array. Memory interleaving of standard

RAM Ram, ram, or RAM may refer to: Animals * A male sheep * Ram cichlid, a freshwater tropical fish People * Ram (given name) * Ram (surname) * Ram (director) (Ramsubramaniam), an Indian Tamil film director * RAM (musician) (born 1974), Dutch * ...

is not affected by the presence of ULLtraDIMMs.

UEFI UEFI (Unified Extensible Firmware Interface) is a set of specifications written by the UEFI Forum. They define the architecture of the platform firmware used for booting and its interface for interaction with the operating system. Examples of f ...

BIOS In computing, BIOS (, ; Basic Input/Output System, also known as the System BIOS, ROM BIOS, BIOS ROM or PC BIOS) is firmware used to provide runtime services for operating systems and programs and to perform hardware initialization during the ...

updates are required to properly recognize an ULLtraDIMM in the system as a block device and not halt the bootstrap sequence.

References

{{Reflist, 2 Computer peripherals Computer storage devices File system management Non-volatile memory Solid-state computer storage Solid-state computer storage media