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2. DDR4 SDRAM - Wikipedia

   en.wikipedia.org/wiki/DDR4_SDRAM

   DDR4 is not compatible with any earlier type of random-access memory (RAM) due to different signaling voltage and physical interface, besides other factors. DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory , [ 6 ] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E ...

3. DDR SDRAM - Wikipedia

   en.wikipedia.org/wiki/DDR_SDRAM

   The DDR4 SDRAM is a high-speed dynamic random-access memory internally configured as 16 banks, 4 bank groups with 4 banks for each bank group for ×4/×8 and 8 banks, 2 bank groups with 4 banks for each bank group for ×16 DRAM. The DDR4 SDRAM uses an 8n prefetch architecture to achieve high-speed

4. GDDR4 SDRAM - Wikipedia

   en.wikipedia.org/wiki/GDDR4_SDRAM

   GDDR4 SDRAM, an abbreviation for Graphics Double Data Rate 4 Synchronous Dynamic Random-Access Memory, is a type of graphics card memory (SGRAM) specified by the JEDEC Semiconductor Memory Standard. [ 1 ] [ 2 ] It is a rival medium to Rambus's XDR DRAM .

5. UD-4 - Wikipedia

   en.wikipedia.org/wiki/UD-4

   UD-4 [1] [2] was a discrete four-channel quadraphonic sound system for phonograph records introduced by Nippon Columbia [3] in 1974.This system had some similarities with the more successful CD-4 process introduced by JVC and RCA in 1972.