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DDR2 (Double Data Rate 2)
- Introduction Year: 2003
- Speed: 400 to 1066 MHz
- Data Rate: 3.2 to 8.5 GB/s
- Voltage: 1.8V
- Latency: Higher latency compared to DDR3
- Pins: 240-pin DIMM (desktop) and 200-pin SODIMM (laptop)
- Key Feature: Improved performance and reduced power consumption compared to DDR.
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DDR3 (Double Data Rate 3)
- Introduction Year: 2007
- Speed: 800 to 2133 MHz
- Data Rate: 6.4 to 17 GB/s
- Voltage: 1.5V (with low-voltage versions at 1.35V and 1.25V)
- Latency: Lower latency than DDR2
- Pins: 240-pin DIMM (desktop) and 204-pin SODIMM (laptop)
- Key Feature: Higher speeds, lower power consumption, and better performance than DDR2.
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DDR4 (Double Data Rate 4)
- Introduction Year: 2014
- Speed: 1600 to 3200+ MHz
- Data Rate: 12.8 to 25.6+ GB/s
- Voltage: 1.2V (with low-voltage versions at 1.05V)
- Latency: Comparable to DDR3 but with higher speeds
- Pins: 288-pin DIMM (desktop) and 260-pin SODIMM (laptop)
- Key Feature: Increased speed, higher efficiency, and improved reliability with error-correcting code (ECC) support.
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DDR5 (Double Data Rate 5)
- Introduction Year: 2020
- Speed: 3200 to 8400+ MHz
- Data Rate: 25.6 to 67.2+ GB/s
- Voltage: 1.1V (with lower voltage versions expected)
- Latency: Comparable to DDR4 with significantly higher speeds
- Pins: 288-pin DIMM (desktop) with a different keying from DDR4
- Key Feature: Substantially higher speed, improved power efficiency, increased bandwidth, and enhanced performance for data-intensive applications.