Memory - RAM

RAM (Random Access Memory) is where data the CPU is working with is temporarily stored. More RAM is generally better, although there are diminishing returns and 32-bit versions of Windows only support a maximum of 4GB. Speed, measured in MHz, is another consideration, but most importantly memory needs to be compatible with your motherboard: it'll either be DDR, DDR2, DDR3 or DDR4. Smaller SODIMM modules for laptops and mini PCs and ECC memory for servers are all available in this category.

DDR3 Single/Dual Channel 1333MHz RAM Memory Kits

DDR3 SDRAM is an evolution of DDR2 SDRAM. Designed for todays systems which support DDR3, the primary benefit of DDR3 is the ability to transfer data at a much higher rate than DDR2 due to the higher clock rate. This allows you to take advantage of the high speeds of todays CPU's. These memory modules are available in single, dual and quad packs, and have a clock speed of 1333Mhz.
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DDR4 Quad Channel 2666MHz RAM Memory Kits

DDR4 SDRAM is the fastest and most efficient consumer memory available. At present, it's only compatible with Intel's X99 motherboards, which run in quad-channel. That's what these modules are designed for, so they're sold in matching kits of four or eight. These are the most premium, fastest kits around, with speeds starting at 2,666MHz and reaching 3,333MHz.

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DDR4 Quad Channel 3200MHz+ RAM Memory Kits

DDR4 SDRAM is the fastest and most efficient consumer memory available. At present, it's only compatible with Intel's X99 motherboards, which run in quad-channel. That's what these modules are designed for, so they're sold in matching kits of four or eight. These are the most premium, fastest kits around, with speeds starting at 2,666MHz and reaching 3,333MHz.

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DDR4 Single/Dual Channel 2400MHz RAM Memory Kits

DDR4 SDRAM is the fastest and most efficient consumer memory available. It's only compatible with Intel's Haswell E which run in quad-channel and Skylake CPUs which run in dual-channel. The latter is what these modules are designed for, so they're sold in matching kits of two modules for best performance or single modules for a cheap upgrade. These are the mid-range kits, with a speed of 2,400MHz.

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DDR4 Single/Dual Channel 2666MHz+ RAM Memory Kits

DDR4 SDRAM is the fastest and most efficient consumer memory available. It's only compatible with Intel's Haswell E which run in quad-channel and Skylake CPUs which run in dual-channel. The latter is what these modules are designed for, so they're sold in matching kits of two modules for best performance or single modules for a cheap upgrade. These are the mid-range kits, with a speed of at least 2,666MHz.

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DDR4 Single/Dual Channel 3000MHz+ RAM Memory Kits

DDR4 SDRAM is the fastest and most efficient consumer memory available. It's only compatible with Intel's Haswell E which run in quad-channel and Skylake CPUs which run in dual-channel. The latter is what these modules are designed for, so they're sold in matching kits of two modules for best performance or single modules for a cheap upgrade. These are the high-end kits, with a speed of at least 3,000Hz.

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