![]() That's why it's faster!įor most people, capacity trumps clock speed and latency every time. Even if it has a higher CAS of 9 cycles, the total latency is 1.25 x 9 = 11.25 ns. Whereas the lowest speed DDR4 RAM runs at is 800MHz, which means a clock cycle of 1/800000000, or 1.25 ns. If you want to use faster RAM, don't mix it with your older, slower modules. The answer is that yes, you can, but they'll all run at the clock speed of the slowest module. You might be wondering if you can mix RAM modules of different clock speeds. Just make sure your motherboard supports the higher RAM clock speed! Manufacturers sometimes sell pre-overclocked RAM, but you can overclock it yourself. Overclocking increases the RAM's bandwidth. It is possible to overclock RAM, just like you can overclock a CPU or graphics card. The DDR5-6400 RAM mentioned above will operate at 6,400MT/s-much faster! The number paired after PC refers to the theoretical bandwidth in megabytes per second. For example, DDR3-1600 RAM operates at 1,600MT/s. The number paired after DDR refers to the number of megatransfers per second (MT/s). The number after DDR/PC and before the hyphen refers to the generation: DDR2 is PC2, DDR3 is PC3, DDR4 is PC4, and DDR5 is PC5. ![]() These both reference and allude to the generation of the RAM and its transfer speed. You may have seen RAM referred to by two sets of numbers, like DDR3-1600 and PC3-12800. Here are the other RAM specification terms you need to know. Also, DDR3 SO-DIMMs have 204 pins versus DDR2's 200 pins. However, it runs a lower voltage and has higher timings (more on RAM timings in a moment), so it isn't compatible. For Intel, that covers the Intel Core i7 line introduction in 2008 through to the 7th generation Kaby Lake CPUs in 2016.ĭDR3 RAM has the same number of pins as DDR2. Why? Because it wasn't until 2016 (two years after DDR4 launched) that DDR4-capable systems really picked up steam.įurthermore, DDR3 RAM covers a huge range of CPU generations, stretching from Intel's LGA1366 socket through to LGA1151, as well as AMD's AM3/AM3+ and FM1/2/2+. Although DDR4 officially superseded it in 2014, you will still find many systems using the older RAM standard. DDR2 has been well and truly superseded, but you can still buy it in limited quantities to upgrade older machines. Losing power is like wiping your desk clean of every document.ĭDR2 is the oldest kind of RAM you're likely to come across today. The contents of your system RAM are lost as soon as you turn the power off. Unlike an office desk, however, RAM cannot act as permanent storage. Just as having a bigger desk can hold more bits of paper on it without becoming messy and unwieldy (as well as requiring more trips back to the filing cabinet to reorganize). The more RAM you have, the more things you can have quick access to at any one time. The RAM is like an entire office workstation, while the CPU cache is like the actual working area where you actively work on a document. The hard drive is the filing cabinet in the corner. Your system uses RAM to store working parts of the operating system temporarily and the data your applications are using actively. It acts as a middle ground between the small, super-fast cache in your CPU and the large, super-slow storage of your hard drive or solid-state drive (SSD). Read on for explanations on the different kinds of RAM, how to read RAM specifications, and exactly how RAM works.
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