RAM Voltage | Memory Voltage Source:
The voltage of the memory (on the motherboard only after the power button is pressed because it is 1.8V for DDR2 or 1.5V for DDR3) appears secondary voltage.Like any switched source, the memory voltage is also composed of a PWM IC, two Mosfets (high and low), an inductor and a filter capacitor.
Let's see an example of how a memory circuit works:
First, the PWM IC receives the supply voltages (19V, 3V, 5V), you will not necessarily find these 3 supply voltages in all secondary PWM ICs, it depends on the project, in some cases there may be one, two or even three voltages in the same IC. Just check the schematic diagram.
In all secondary PWM ICs, the enabling voltages (ENTRIP or EN or ON = 3V) come from Super I/O.
RAM stands for Random Access Memory, and it gives laptops the virtual space needed to manage information and solve problems in the moment.
You can think of it like reusable scratch paper that you would write notes, numbers, or drawing with a pencil. If you run out of room on the paper, you make more by erasing what you no longer need, RAM behaves similarly, when it needs more space to deal with temporary information (i.e. running software/programs). Larger pieces of paper allow you to scribble out more (and bigger) ideas at a time before having to erase more RAM inside of laptops shares a similar effect.
The CPU has a full control of the RAM I/O data, and the ram directly communicate with CPU, no direct-communications between the RAM and other circuits.
Double Data Rate Synchronous Dynamic RAM (DDR SDRAM):
1. DDR SDRAM operates like SDR SDRAM, only twice as fast. DDR SDRAM is capable of processing two read and two write instructions per clock cycle (hence the double). Although similar in function, DDR SDRAM has physical differences (184 pins and a single notch on the connector) versus SDR SDRAM (168 pins and 2 notches on the connector).2. DDR2 SDRAM is the evolutionary upgrade to DDR SDRAM. While still double data rate (processing two read and two write instructions per clock cycle), DDR2 SDRAM is faster because it can run at higher clock speeds. Standard (not over clocked) DDR memory modules top out at 200 MHz, whereas standard DDR2 memory modules top out at 533 MHz. DDR2 SDRAM runs at a lower voltage (1.8 V) with more pins (240), which prevents backwards compatibility.
3. DDR3 SDRAM improves performance over DDR2 SDRAM through advanced signal processing (reliability), greater memory capacity, lower power consumption (1.5 V), and higher standard clock speeds (up to 800 Mhz). Although DDR3 SDRAM shares the same number of pins as DDR2 SDRAM (240|), all other aspects prevent backwards compatibility.
4. DDR4 SDRAM improves performance over DDR3 SDRAM through more advanced signal processing (reliability), even greater memory capacity, even lower power consumption (1.2 V), and higher standard clock speeds (up to 1600 Mhz). DDR4 SDRAM uses a 288- pin configuration, which also prevents backwards compatibility.
