LR-DIMM Introduction

1. LR-DIMM Introduction

2. Load-Reduced DIMM Similar to DDR2 FB-DIMM, LR-DIMMs reduce the load on the memory controller by communicating through a Memory Buffer • Higher maximum capacity for fully-populated motherboards • Increased performance– maintain high data rate without sacrificing capacity • Lower power consumption than UDIMM/RDIMM when many modules are installed • Pin-compatible with RDIMM & UDIMM (motherboard BIOS must support LR-DIMM) Max Speed & Capacity!

3. P/N - TS4GKB72W3P 32GB DDR3L 1333 LR-DIMM 4Rank x4 (1.35V) Transcend LR-DIMM Sticker Appearance

4. R-DIMM vs. LR-DIMM (1/2) System Memory Controller System Memory Controller Registered DIMM Although commands are sent only to the register… Data must be transferred from each DRAM chip individually (Heavy system load limits max capacity) Data Commands (Register)

5. R-DIMM vs. LR-DIMM (1/2) System Memory Controller System Memory Controller Load Reduced DIMM All commands and dataare communicated through the intelligent Memory Buffer Because the system’s Memory Controller workload is reduced, more modules can be installed Data Commands (Memory Buffer) (Memory Buffer)

6. LR-DIMM Motherboard Examples Tyan S7053GM2NR Intel Xeon E5 2600, 4Ch RAM 16 512GB

7. LR-DIMM Motherboard Examples SuperMicro X8DAH+-LR Intel Xeon 5500/5600, 3Ch RAM 12 384GB

8. LR-DIMM Motherboard Examples Intel S2600CO Family Intel Xeon E5 2600, 4Ch RAM 24 768GB

9. Thank you