DDR SDRAM. SDR SDRAM , , , ( ), 4- , - . SDR DDR . SDR SDRAM () . SDRAM , SDR SDRAM . , DDR ( DDR2) (), ().
? 2 ( ), 2 ( ). , DDR , , DDR, (, DDR 200 DDR-400). , , , DDR SDRAM. , DDR SDRAM, 2n- (2n-prefetch). ( , SDR SDRAM, ). , . , (Burst Length, BL) DDR SDRAM 2.
DDR2 SDRAM 2n-prefetch, DDR SDRAM. , DDR2 SDRAM 4n-prefetch , , . , Double Data Rate 2- . , DDR2 SDRAM DDR SDRAM, . , , 2.5 1.8 V ( 90- ), , . , 4n-prefetch DDR2 DDR . DDR2-800 ( 400 ) , DDR DDR-400 ( 200 ).
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DDR2 DDR DDR2 DDR. . , DDR, , / DDR2, . , DDR2 DDR, - , ( , , ) , . , , DDR2 . , , , , / . , / ( 4n-prefetch), .. 4- . , (BL) 4. , , , 2nn-prefetch Burst Length, 2n (n = 1 DDR; n = 2 DDR2; n = 3 DDR3).
9.1.
, / | ||
DDR2-400 | ||
DDR2-533 | ||
DDR2-667 | ||
DDR2-800 | ||
DDR2-1000 | ||
DDR2-1066 | ||
800 Quad-Pumped Bus(Pentium 4, Pentium D) | ||
1066 Quad-Pumped Bus (Pentium 4 Extreme Edition) |