Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
Longest-Running Tech Reference on the Planet

A CDE Definition

You'll love The Computer Desktop Encyclopedia (CDE) for Tech Term of the Day (TTOD)

LOOK UP ANOTHER TERM


3D Crosspoint

See 3D XPoint.



3D XPoint

(3D Cross Point) A non-volatile phase change memory and storage technology from Intel and Micron. Optane is Intel's brand for 3D XPoint, while Micron uses the QuantX moniker. Less expensive and denser than dynamic RAM (DRAM), XPoint is more costly than NAND flash but is considerably faster while using less power.

Both Memory and Storage
3D XPoint has unique attributes. Like all RAM chips (DRAM and SRAM), it is byte addressable and can thus be used as main memory or as a secondary RAM bank. Because it is non-volatile, it can also replace an SSD or hard drive or be used in conjunction with them.

XPoint is expected to be available in 256GB and 512GB modules compared to DDR4 capacities, which typically max out at 64GB. See byte addressable and SDRAM.




Cross Point Structure
Voltage applied to the top and bottom wire of the selector causes the cell to be read or written, and transistors are not required at each cell like they are with DRAM. Unlike flash memory that has a limited life span, XPoint is not affected by the number of write cycles. (Image courtesy of Intel.)



         Byte        Non-
      Addressable  Volatile   Speed

 SRAM     Yes        No      Fastest

 DRAM     Yes        No      Faster

 XPoint   Yes        Yes     Fast

 NAND     No         Yes     Slow





Personal Use Only

Before/After Your Search Term
BeforeAfter
3D3D digitizer
3D 4K TV3D DVD
3D accelerator3D Fax
3D anaglyph3D FFT
3D animation3D gaming
3D audio3D glasses
3D Blu-ray3D goggles
3D CAD3D graphics
3D chat3D graphics pipeline
3D cinema3D HD

Terms By Topic
Click any of the following categories for a list of fundamental terms.
Computer Words You Gotta KnowSystem design
Job categoriesUnix/Linux
Interesting stuffPersonal computers
InternetIndustrial Automation/Process Control
Communications & networkingAssociations/Standards organizations
HistoryDesktop publishing
Audio/VideoGraphics
MainframesSecurity
ProgrammingHealthcare IT
System design