DDR4 Memory Technology

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•  = Device organisation (data bid width, e.g. x4, x8, x16)
• PC4v = Indicates that this is a DDR4 module and the supported component supply voltage
– PC4 = operates at 1.2V
– PC4L = operates at a lower voltage TBD
• wwww = Module Speed in MHz pin
• aa = SDRAM speed grade
• m = module type
– U = Unbuered
– E = ECC unbuered
– R = Registered
– L = LR DIMM
• cc = Reference design le used in this design
• d = Revision number of the reference design used
• bb = JEDEC SPD Revision Encoding and additions level used on this DIMM
Learn more at
Tezzaron Semiconductor: Soft Errors in Electronic Memory: White Paper 2004
http://www.tezzaron.com/about/papers/soft_errors_1_1_secure.pdf
University of Toronto Study: DRAM Errors in the Wild:
A large-Scale Field Study; A cooperative study with Google of DRAM failures in actual use.
http://www.cs.utoronto.ca/~bianca/papers/sigmetrics09.pdf
HP Workstation Individual Platform Memory Congurations and Optimization White Papers
hp.com/go/whitepapers
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4AA5-4998EEW, April 2016
Technical white paper | DDR4 Memory Technology on HP Z Workstations