HP DL360 Memory technology evolution: an overview of system memory technologie - Page 1

Memory technology evolution: an overview of system memory technologies technology brief, 8th edition Abstract...2 Introduction ...2 Basic DRAM operation ...2 DRAM storage density and power consumption 4 Memory access time ...5 System bus timing ...5 Memory bus speed...6 Burst mode access...6 SDRAM technology ...7 Bank interleaving ...7 Increased bandwidth ...7 Registered SDRAM modules ...8 DIMM configurations ...8 Single-sided and double-sided DIMMs 8 Single-rank, dual-rank, and quad-rank DIMMs 8 DIMM error detection/correction technologies 10 The increasing possibility of memory errors 10 Basic ECC memory ...11 Advanced ECC memory ...12 Memory protection technologies ...13 Online spare memory mode ...13 Mirrored memory mode ...13 Lockstep memory mode ...14 Memory protection mode summary 14 Advanced memory technologies ...15 Double data rate SDRAM technologies 15 DDR-1 ...15 DDR-2 ...17 DDR-3 ...18 Module naming convention and peak bandwidth 18 Fully-buffered DIMMs ...19 Rambus DRAM ...21 Importance of using HP-certified memory modules in ProLiant servers 23 Conclusion...23 For more information...24 Call to action ...24