Memory Ddr

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can someone please explain the difference between dram, sdram,ddr and ddr2?

Im just starting to study for comptia a+ and cant understand what im reading
any help will be appreciated

SDRAM stands for Synchronous Dynamic Random Access Memory. DDR is short for "DDR SDRAM" and stands for Double Data Rate. Nowadays to avoid misunderstandings SDRAM is often specified as SDR SDRAM and SDR stands for Single Data Rate by analogy with DDR. Therefore, the main difference between SDR and DDR memory the doubled speed: DDR can transfer data at roughly twice the speed of SDRAM. For example, PC133 SDRAM runs at 133 Mhz, while 133 Mhz DDR effectively runs at 133 Mhz x 2 = 266 Mhz.

SDRAM has 168 pins and two notches at the connector, which prevents it from being used in a DDR SDRAM motherboard and vice versa. It comes mainly in PC66, PC100 and PC133; the bus speeds of the RAM in MHz.

DDR SDRAM has 184 pins and a single notch at the connector. It comes in speeds of PC1600 (166 MHz), PC1800 (200 MHz), PC2100 (266 MHz), PC2700 (333 MHz), PC3200 (400 MHz), and PC4400 (550 Mhz). The numbers represent the theoretical maximum bandwidth of the DDR SDRAM in Megabytes per second (MB/s). For example, PC2100 has a theoretical maximum bandwidth of 2100 MB/s.

well i hope this helped

Find Memory Ddr On eBay Below:

HP RAM Module 4GB 1600MHz DDR3 647895 S21 Server RAM 800130970
HP RAM Module 4GB 1600MHz DDR3 647895 S21 Server RAM 800130970
$16.11
32GB Kit Micron Samsung IBM 4x 8GB DDR2 400mhz ECC REG 276 PIN Server Memory RAM
32GB Kit Micron Samsung IBM 4x 8GB DDR2 400mhz ECC REG 276 PIN Server Memory RAM
$19.99
SET OF 2 HP 512MB PC2100 DDR Memory Module 175925 001 512 MB
SET OF 2 HP 512MB PC2100 DDR Memory Module 175925 001 512 MB
$19.99
8GB Micron IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
8GB Micron IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
$17.99
4GB Memory DDR3 1333 PC3 10600 ECC for Dell Precision Workstation T3500
4GB Memory DDR3 1333 PC3 10600 ECC for Dell Precision Workstation T3500
$27.75
4GB Memory DDR3 1333 PC3 10600 Non ECC for Dell Precision Workstation T3500
4GB Memory DDR3 1333 PC3 10600 Non ECC for Dell Precision Workstation T3500
$22.25
8GB 2x 4GB DDR3 1333 PC3 10600 Non ECC for Dell Precision Workstation T3500
8GB 2x 4GB DDR3 1333 PC3 10600 Non ECC for Dell Precision Workstation T3500
$52.50
8GB2 x 4GB Memory DDR3 1333 PC3 10600 ECC for Dell Precision Workstation T3500
8GB2 x 4GB Memory DDR3 1333 PC3 10600 ECC for Dell Precision Workstation T3500
$56.49
Crucial CT16G4RFD424A 16GB DDR4 2400 MHz RDIMM ECC Memory Module
Crucial CT16G4RFD424A 16GB DDR4 2400 MHz RDIMM ECC Memory Module
$215.88
8GB Samsung IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
8GB Samsung IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
$17.99
Micron 2GB DDR2 PC2 5300P CL5 667MHz 240p ECC REG PNMT36HTF25672PY 667F1
Micron 2GB DDR2 PC2 5300P CL5 667MHz 240p ECC REG PNMT36HTF25672PY 667F1
$9.99
8GB Infineon IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
8GB Infineon IBM Kit 2x 4GB DDR2 533mhz PC2 4200R CL4 276 PIN ECC Registered RAM
$17.99
Hynix HMA41GU6AFR8N TF 8GB DDR4 2133 2Rx8 Non ECC UDIMM Server Memory
Hynix HMA41GU6AFR8N TF 8GB DDR4 2133 2Rx8 Non ECC UDIMM Server Memory
$79.00
Micron 8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Registered Server Memory
Micron 8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Registered Server Memory
$35.50
Micron 16GB 2x8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Server Memory RAM
Micron 16GB 2x8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Server Memory RAM
$65.00
Micron 32GB 4x8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Server Memory RAM
Micron 32GB 4x8GB 1RX4 PC3 14900R DDR3 1866Mhz 240Pin ECC REG Server Memory RAM
$126.00
Nanya 16GB 4X4GB 2RX8 PC3 10600E DDR3 1333Mhz ECC Non Registered Server Memory
Nanya 16GB 4X4GB 2RX8 PC3 10600E DDR3 1333Mhz ECC Non Registered Server Memory
$136.30
IBM 4GB RAM Kit 2x2 PC2 3200R ECC REG 2Rx4 DDR2 400 Memory 128ft5811
IBM 4GB RAM Kit 2x2 PC2 3200R ECC REG 2Rx4 DDR2 400 Memory 128ft5811
$12.47
Nanya 32GB 8X4GB 2RX8 PC3 10600E DDR3 1333 ECC Non Registered Server Memory Ram
Nanya 32GB 8X4GB 2RX8 PC3 10600E DDR3 1333 ECC Non Registered Server Memory Ram
$267.90
726720 B21 HP 16GB 1X16GB 2RX4 PC4 2133P L DDR4 MEMORY MODULE 752371 081
726720 B21 HP 16GB 1X16GB 2RX4 PC4 2133P L DDR4 MEMORY MODULE 752371 081
$125.00
Nanya 16pcs 4GB 2RX8 PC3 10600E DDR3 1333 15V ECC Non Registered Server Memory
Nanya 16pcs 4GB 2RX8 PC3 10600E DDR3 1333 15V ECC Non Registered Server Memory
$531.10
500666 B21 501538 001 500207 071 HPE 16GB QRX4PC3 8500R DDR3 1066 Memory Ref
500666 B21 501538 001 500207 071 HPE 16GB QRX4PC3 8500R DDR3 1066 Memory Ref
$299.00
726718 B21 HP 8GB PC4 17000 DDR4 2133MHz ECC Memory  Factory Sealed Retail
726718 B21 HP 8GB PC4 17000 DDR4 2133MHz ECC Memory Factory Sealed Retail
$128.90
HP 8GB 2Rx4 PC3 12800R DDR3 Registered Server RAM Module REG ECC 689911 071
HP 8GB 2Rx4 PC3 12800R DDR3 Registered Server RAM Module REG ECC 689911 071
$29.10
Hynix 128GB 8X16GB 4RX4 PC3L 8500R DDR3 1066Mhz ECC REG Server RAM Memory Module
Hynix 128GB 8X16GB 4RX4 PC3L 8500R DDR3 1066Mhz ECC REG Server RAM Memory Module
$332.50
1pcSamsung M393A1G43DB0 CPB PC4 2133P 8G 2R8 DDR4 2133MHZ Desktop Memory RAMSS
1pcSamsung M393A1G43DB0 CPB PC4 2133P 8G 2R8 DDR4 2133MHZ Desktop Memory RAMSS
$199.00
Samsung 64GB 8x8GB 2Rx4 PC3 10600R DDR3 1333Mhz 240PIN ECC REG Server Memory RAM
Samsung 64GB 8x8GB 2Rx4 PC3 10600R DDR3 1333Mhz 240PIN ECC REG Server Memory RAM
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516423 B21 HP 8GB PC3 8500 DDR3 1066MHz ECC Registered Memory Module  Pulled
516423 B21 HP 8GB PC3 8500 DDR3 1066MHz ECC Registered Memory Module Pulled
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Lot of 4 Samsung 16GB PC3L 12800R DDR 1600MHz Server Memory M393B2G70BH0 YK0
Lot of 4 Samsung 16GB PC3L 12800R DDR 1600MHz Server Memory M393B2G70BH0 YK0
$179.00
New Samsung 128GB 8X16GB 4RX4 PC3L 8500R DDR3 1066Mhz 240Pin ECC REG Server RAM
New Samsung 128GB 8X16GB 4RX4 PC3L 8500R DDR3 1066Mhz 240Pin ECC REG Server RAM
$332.50
1pcSamsung M474A2K43BB1 CRC PC4 2400T 16G 2R8 DDR4 2400MHZ Laptop Memory RAMSS
1pcSamsung M474A2K43BB1 CRC PC4 2400T 16G 2R8 DDR4 2400MHZ Laptop Memory RAMSS
$345.00
Fr Skhynix 16GB REG ECC 4RX4 DDR3 1066MHZ PC3 8500R Server Memory RegisteredRAM
Fr Skhynix 16GB REG ECC 4RX4 DDR3 1066MHZ PC3 8500R Server Memory RegisteredRAM
$69.99


Recently Purchased Memory Ddr:


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