I bet we all heard the word “RAM” right? lets find out more about it.
Random Access Memory (RAM) gives space for your PC to makes it read and write data so it could be used by the CPU (Central Processing Unit).
When you add more ram to your PC, you will reduce the amount of times your CPU that must to read data from your HDD ( Hard Disk Drive). This will make your PC work much faster, as RAM is many times faster than a hard disk drive(HDD).
RAM is volatile, so data stored in RAM stays there only as long as your computer is running. As soon as you turn the computer off, the data stored in RAM disappears.
Types of RAM’s
1.SDRAM / Dynamic Random Access Memory
2.DDR / Double Data Rate
3.DDR2 / Double Data Rate two
4.DDR3 / Double Data Rate three
SDRAM: Typical SDR SDRAM clock rates are 66, 100, and 133 MHz (15, 10, and 7.5 ns/cycle). Clock rates up to 150 MHz were available for performance enthusiasts.
DDR: running at 100Mhz, 133Mhz, 166Mhz, 200Mhz, 233Mhz, or 266Mhz. What makes this separate from current SDRAM is that DDR can transfer memory on both the rise and the fall of a clock cycle. So, essentially, you are getting 200Mhz, 266Mhz, 333Mhz, 400Mhz, 466Mhz, or 533Mhz therespectively.
DDR2: running at 266Mhz, 337Mhz, 375Mhz, 400Mhz, and 450Mhz. So, essentially, you are getting 533Mhz, 675Mhz, 750Mhz, 800Mhz, and 900Mhz respectively.
DDR3: running at 533Mhz, 666Mhz, and 800Mhz which provides a total speed of 1066Mhz, 1333Mhz, and 1600Mhz.( They made a new RAM at PC-1000/1250Mhz)
Q: How can I read RAM’s speed?
DDR Models:
DDR2 Models:
| Standard name | Memory clock | Cycle time | I/O Bus clock | Data transfers per second | Module name | Peak transfer rate |
| DDR2-400 | 100 MHz | 10 ns | 200 MHz | 400 Million | PC2-3200 | 3200 MB/s |
| DDR2-533 | 133 MHz | 7.5 ns | 266 MHz | 533 Million | PC2-4200 PC2-43001 |
4266 MB/s |
| DDR2-667 | 166 MHz | 6 ns | 333 MHz | 667 Million | PC2-5300 PC2-54001 |
5333 MB/s |
| DDR2-800 | 200 MHz | 5 ns | 400 MHz | 800 Million | PC2-6400 | 6400 MB/s |
| DDR2-1066 | 266 MHz | 3.75 ns | 533 MHz | 1066 Million | PC2-8500 PC2-86001 |
8533 MB/s |
DDR3 Models:
| Standard name | Memory clock | Cycle time | I/O Bus clock | Data transfers per second | Module name | Peak transfer rate |
| DDR3-800 | 100 MHz | 10 ns | 400 MHz | 800 Million | PC3-6400 | 6400 MB/s |
| DDR3-1066 | 133 MHz | 7.5 ns | 533 MHz | 1066 Million | PC3-8500 | 8533 MB/s |
| DDR3-1333 | 166 MHz | 6 ns | 667 MHz | 1333 Million | PC3-10600 | 10667 MB/s |
| DDR3-1600 | 200 MHz | 5 ns | 800 MHz | 1600 Million | PC3-12800 | 12800 MB/s |
| Unofficial name | Memory clock | Cycle time | I/O Bus clock | Data transfers per second | Module name | Peak transfer rate |
| DDR3-1800 | 225 MHz | 4.4 ns | 900 MHz | 1800 Million | PC3-14400 | 14400 MB/s |
| DDR3-1866 | 233 MHz | 4.3 ns | 933 MHz | 1866 Million | PC3-14900 | 14928 MB/s |
| DDR3-2000 | 250 MHz | 4 ns | 1000 MHz | 2000 Million | PC3-16000 | 16000 MB/s |
| DDR3-2400 | 300 MHz | 3.3 ns | 1200 MHz | 2400 Million | PC3-19200 | 19200 MB/s |
Source:
Wikipedia – http://en.wikipedia.org
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