What is RAM? Ultimate Guide to Computer RAM

The video discusses examples of DDR3 RAM across different capacities (4GB), speeds (1600 to 1866 megatransfers per second), and voltages (1.35V to 1.65V). It explains that low voltage RAM decreases heat and power usage.

RAM is an essential part of every computer, serving as its short-term memory, which stores data for quick access. It's much faster than an SSD or hard drive but holds less data and loses it when the power is off. The video aims to answer questions about RAM's importance, necessary amount, and speed, while clarifying common myths.

Desktop RAM comes in various appearances, including standard sticks, low-profile designs, and those with large heat sinks. Modern desktop RAM is typically DDR4, though DDR3 is still widely used. New RAM generations (like DDR1 to DDR4) are developed to increase speed and reduce power consumption, necessitating new motherboards and CPUs.

Many PC builders overestimate their RAM needs. Having sufficient RAM allows your computer to access information quickly. If RAM fills up, performance slows significantly. For most users, 8GB of RAM is more than enough for multitasking and demanding games. 4GB is adequate for lower-end PCs, while 16GB or more is primarily beneficial for specific tasks like video editing with large files.

RAM speed is measured in megatransfers per second (MT/s). DDR stands for double data rate, meaning two transfers per clock cycle. For DDR3, speeds around 1600 MT/s are generally sufficient, and for DDR4, about 2400 MT/s. Higher speeds beyond these often yield only marginal performance improvements (0-5%). Timings also affect speed, with lower numbers indicating faster RAM, though their impact is minor.

Voltage affects RAM heat production and power consumption. Standard DDR3 voltage is 1.5V, with some running at a more efficient 1.35V or a higher 1.65V. DDR4 is even more efficient at 1.2V. Lower voltage is particularly beneficial for smaller devices like laptops and phones, contributing to longer battery life.

Using multiple smaller RAM sticks is better due to dual-channel mode, offering a slight performance increase. Mixing RAM brands or speeds is generally fine; all RAM will operate at the lowest common speed and timings. Mixing completely different RAM types (e.g., DDR3 and DDR4, or laptop and desktop RAM) will not work. RAM heat sinks are mostly aesthetic and unnecessary unless overclocking, as cheap ones can even increase RAM temperature.