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PC DRAM Memory by John Anthony PC Main memory is used to store programs and data electronically when your PC is running. Memory capacity is measured in megabytes MB (millions of bytes) and gigabytes GB (billions of bytes). Memory speed (transfer rates) are measured in the number of bytes (data) transferred in or out of the memory per second. Fast high capacity memory allows your PC to run multiple programs with out slowing down and with much less of a chance of crashing. The memory type used in main memory is called DRAM (Dynamic Random Access Memory). Dynamic implies that the memory must be electronically refreshed periodically. If it isn't refreshed the contents of the memory will be lost. DRAM has evolved much in the last few years. SD RAM (Synchronous DRAM) was the first synchronous memory available for PCs moving data at 100 MB/sec. DDR (double data rate) memory transfers data twice per clock cycle yielding transfer rates of up to 3200 MB/sec. DDR2 has improved performance up to 6400 MB/sec with lower power consumption than DDR. DDR3 provides higher performance at up 128 GB/sec. DDR4 provides the highest performance at up to 512 GB/sec. All of SD RAM and DDRx memories are of the DIMM form factor. DIMM (Dual Inline Memory Module) is a small narrow circuit board containing individual memory chips that together give it the required capacity. DIMMs plug into the motherboard. Recommendation: Determine the type of memory your PC can support and buy as much of it as you can because bigger memory with high speed transfer rates means higher PC performance. Contact Information Computer Help A to Z 88 Windmere Drive Angier, NC 27501 CompHelpAtoZ@charter.net Copyright 2000-2018

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