so this is going to be a simple tips post about the basics of desktop RAM
1: Capacity
DDR 64MB - 2GB
DDR2 512MB - 4GB
DDR3 1GB - 32GB
DDR4 4GB - 128GB
2: Pin Count
DDR - 184
DDR2 - 240
DDR3 - 240
DDR4 - 288
3: Voltage
DDR 2.5V - 2.6V
DDR2 1.8V
DDR3 1.5V - 1.65
DDR4 1.05V - 1.2V
1: Capacity
DDR 64MB - 2GB
DDR2 512MB - 4GB
DDR3 1GB - 32GB
DDR4 4GB - 128GB
2: Pin Count
DDR - 184
DDR2 - 240
DDR3 - 240
DDR4 - 288
3: Voltage
DDR 2.5V - 2.6V
DDR2 1.8V
DDR3 1.5V - 1.65
DDR4 1.05V - 1.2V