{"id":180,"date":"2011-11-22T22:57:06","date_gmt":"2011-11-22T22:57:06","guid":{"rendered":"http:\/\/microsoftgeek.com\/?p=180"},"modified":"2011-11-22T22:57:06","modified_gmt":"2011-11-22T22:57:06","slug":"types-of-memory","status":"publish","type":"post","link":"https:\/\/microsoftgeek.com\/?p=180","title":{"rendered":"Types of Memory"},"content":{"rendered":"\n\n\n\n\n\n\n\n\n\n
Type of Memory<\/td>\nDescription<\/td>\n<\/tr>\n
DRAM (Dynamic RAM)<\/td>\nMemory that must be refreshed.<\/td>\n<\/tr>\n
SRAM (Static RAM) (L1, L2, L3)<\/td>\nDoes not require refresh. Used for cache memory.<\/td>\n<\/tr>\n
SDRAM (Synchronous Dynamic RAM)<\/td>\nSynced with the CPU clock. 168-pin.<\/td>\n<\/tr>\n
DDR (Double Data Rate) SDRAM<\/td>\nData read on rising and falling edge of computer clock to double the bandwidth of SDRAM. 184-pin, 64-bit DIMM.<\/td>\n<\/tr>\n
DDR2<\/td>\nSimilar to DDR but 240-pin, 64-bit DIMM. Faster than DDR.<\/td>\n<\/tr>\n
Single Ranked DDR<\/td>\nUses one DDR module in a single slot.<\/td>\n<\/tr>\n
Double Ranked DDR<\/td>\nUses two DDR modules in two slots to double bandwidth to the system bus.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Form Factors<\/p>\n\n\n\n\n\n\n\n
Form Factor<\/td>\nDescription<\/td>\n<\/tr>\n
DIMM (Dual Inline Memory Module)<\/td>\n168, 184, or 240-pin. Pins on both sides are independent. SDRAM uses DIMM. 64-bits.<\/td>\n<\/tr>\n
SoDIMM (Small outline DIMM)<\/td>\nUsed in notebook computers. 72-pin is 32-bits and 144-pin is 64-bits.<\/td>\n<\/tr>\n
MicroDIMM<\/td>\nSmaller than a SoDiMM, used in sub-notebook computers. 144-pin SDRAM,
\n172-pin DDR, 214-pin DDR2.<\/td>\n<\/tr>\n
RIMM (Rambus Inline Memory Module)<\/td>\n184 or 168-pin, 16 or 32-bit, 800-1600 MHz, 2 notches. Each RIMM slot must be filled. C-RIMM can fill empty slots. Uses heat spreader. Current DDR and DDR2 is faster and less expensive.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Calculating DDR Memory performance:<\/p>\n

MHz x Clock Cycles x Bus Width<\/p>\n

Example:<\/p>\n

500 MHz x 2 clock cycles x 8 bytes = 8,000<\/p>\n

500 x 2 x 8 = 8,000<\/p>\n

This memory would have a throughput value of 8,000 MB per second (or 8 GB per second) and would be referred to as PC2-8000<\/p>\n","protected":false},"excerpt":{"rendered":"

Type of Memory Description DRAM (Dynamic RAM) Memory that must be refreshed. SRAM (Static RAM) (L1, L2, L3) Does not require refresh. Used for cache memory. SDRAM (Synchronous Dynamic RAM) Synced with the CPU clock. 168-pin. DDR (Double Data Rate) SDRAM Data read on rising and falling edge of computer clock to double the bandwidth […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-180","post","type-post","status-publish","format-standard","hentry","category-computer-tech-stuff"],"_links":{"self":[{"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/posts\/180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=180"}],"version-history":[{"count":1,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/posts\/180\/revisions"}],"predecessor-version":[{"id":181,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=\/wp\/v2\/posts\/180\/revisions\/181"}],"wp:attachment":[{"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microsoftgeek.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}