One of the most crucial pieces in your computer's hardware is the Synchronous Dynamic Random Access Memory or SDRAM. It gives the computer the ability to pick a certain data from the memory that you wish to use. As opposed to sequential access memory (SAM) like that of a tape drive, the computer doesn't have to go through all the other data in order to pick out its target. So whether you're buying an entirely new desktop computer or just upgrading your PC memory, naturally, you'd look for a fast RAM. But speed isn't everything, and as what you'd learn later there are other factors worth looking at before buying one. Read buying guide

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  • Corsair Apple Qualified 8gb 2x4gb Ddr3 Dram Sodimm 1333mhz -CMSA8GX3M2A1333C9
    $53.13 $73.37 -28%
  • Corsair Apple Qualified 4gb 1x4gb Ddr3 Dram Sodimm 1066mhz-CMSA4GX3M1A1066C7
    $45.15 $62.35 -28%
  • Corsair Memory for Mac 1x 4GB Dual Channel DDR3 SODIMM 1333MHz - CMSA4GX3M1A1333C9
    $47.95 $61.00 -21%
  • Corsair 32GB (2x 16GB) DDR4 SODIMM 2666MHz 1.2V Memory for Mac Memory RAM [CMSA32GX4M2A2666C18
  • Crucial 8GB DDR3 1333 for Mac 1x 8GB SODIMM 1.35V [CT8G3S1339M
  • Crucial DDR3 SODIMM PC12800-4GB 1600Mhz CL11 204-Pin 1.35V/1/5V Notebook Memory for Mac [CT4G3S160BM
  • G.Skill DDR3-1066 8GB Dual Channel Mac SODIMM SQ FA-8500CL7D-8GBSQ [GS-FA-8500CL7D-8GBSQ
  • Crucial 8GB DDR3 1866 MT/s (PC3-14900) CL13 Unbuffered ECC UDIMM 240-Pin for Mac [CT8G3W186DM
  • Crucial 16GB (1x 16GB) DDR4 2400 for Mac SODIMM [CT16G4S24AM
  • Apple Memory Module 8GB 1333MHz DDR3 (PC3-10600) - 2x4GB
  • OWC 6.0GB Kit (2.0GB+4.0GB) PC2-6400 DDR2 800MHz SO-DIMM 200 Pin Memory Upgrade Kit
  • OWC 8.0 GB (2X 4GB) PC8500 DDR3 1066 MHz 204-pin Memory Upgrade Kit for MacBook Pro, MacBook, Mac Mini and iMac
  • Komputerbay MACMEMORY 16GB Dual Channel Kit 2X 8GB 204pin 1.35v DDR3-1867 SO-DIMM 1867/14900S (1867MHz, CL13) for Apple iMac 27" 5K (Late 2015)
  • 8GB DDR3 1333 MT/s (PC3-10600) CL9 SODIMM 204pin 1.35V/1.5V RAM for Mac, CT8G3S1339M
  • A-Tech for Apple 8GB Memory Ram Module PC3-12800 1600MHz Macbook Pro 13-inch/15-inch Mid 2012 iMac 21.5 inch Late 2012 Early Late 2013 Late 2014 Mid 2015 Mac Mini Late 2012 A1286 MD101LL/A MD102LL/A
  • Crucial 4GB DDR3 1066 MT/s (PC3-8500) CL7 SODIMM 204pin RAM for Mac, CT4G3S1067M
  • Kingston Technology HyperX Impact 32GB 2666MHz DDR4 CL15 260-Pin SODIMM Laptop Memory 8GB
  • Patriot Mac Series 16GB Apple SODIMM Kit (2X8GB) DDR3 1333MHz (PC3-10600) 204-Pin SO-DIMM PSA316G1333SK
  • OWC 16.0GB (4 x4GB) PC8500 DDR3 1066 MHz 240 pin Memory Upgrade Kit for Apple iMac 21.5 inch and 27 inch Models
  • OWC 4.0GB Kit (2 x 2GB) PC2-6400 DDR2 800MHz SO-DIMM 200 Pin Memory Upgrade Kit
  • Crucial 8GB Kit (4GBx2) DDR3 1333 MT/s (PC3-10600) CL9 SODIMM 204pin 1.35V/1.5V RAM for Mac, CT2K4G3S1339M, Beige
  • A-Tech for Apple 8GB Memory Ram Kit 2x4GB PC3-8500 1066MHz Macbook Late 2008 2009 Mid 2010 Macbook Pro Late 2008 Early 2009 Mid 2009 Mid 2010 iMac Early Mid Late 2009 Mac Mini Early Late 2009 Mid 2010
  • A-Tech for Apple 16GB Memory Ram Kit 2X 8GB PC3-12800 1600MHz MacBook Pro 13-inch/15-inch Mid 2012 iMac 21.5 inch Late 2012 Early Late 2013 Late 2014 Mid 2015 Mac Mini Late 2012 MD634G/A ME167G/A
  • Crucial 4GB (1x4GB) DDR3 1866 for MAC SODIMM 1.35V Memory - CT4G3S186DJM
    $56.95 $79.99 -29%

Buying guide

Types of PC MemoryComputer Memory on Shopbot

Before the year 2000, all SDRAMs can only perform under the single data rate (SDR) interface. But as computers grew more powerful, so did the demand for a faster memory. This is when the double data rate (DDR) technology entered the scene. The DDR interface nearly doubles the processing speed of SDR while significantly reducing operational temperature and power consumption which made it the current standard in the industry. Its conception, in turn, gave birth to the three most common types of PC memory: DDR, DDR2 and DDR3.



The DDR interface is the first step in the evolution and was quite promising during its heyday. If your computer has been around for less than a decade, then most probably, it has a DDR-SDRAM. It comes in 184-pin DIMM format (see form factors) and has a clock rate of 100-200 MHz. Compared to the original SDR-SDRAM, the DDR consumes less electricity at 2.5 volts while delivering faster transfer rates of up to 400 MTps. For as long as they have the same speed, you can attach more than one DDR inside your CPU. 



Just a few years after it first came out, the DDR proved insufficient, and DDR2 technology knocked it off from the pedestal. Sporting a 240-pin DIMM format, it promised to give PC owners back then more (200-533MHz clock rate, 1066MTps) for less (1.8 volts). You can even use multiple DDR2 SDRAMs with different speeds, however, the faster one will adapt to match the slower SDRAMÕs speed.

349-PC_Memory > CorsairMemory



Though soon to be dethroned by DDR4, the DDR3 is the current SDRAM chipset standard. It also comes in the 240-pin DIMM format like the DDR2, however, you may not insert it into a DDR2 socket as its slots are slightly different.


It clocks at 400-1066MHz, has a maximum transfer rate of 2133MTps and is even more energy efficient, chugging only 1.5 volts.

Form factor


With so many manufacturers of computer parts all over the world, it is important for them to agree on the dimension, shape and other details of the products they produce, The standard created to refer to these external features is called form factor. With the form factor, it is possible to assemble a PC from parts with different brands. Remember, though, that you can only use a certain SDRAM form factor if your motherboard chipset supports it. Usually, the way to distinguish one form factor from another is the number of pins. The most common form factor today is the DIMM (dual in-line memory module). DDRs in DIMM format have 168 pins, DDR2 has 200 or 240 pins, while DDR3 has 240 pins, as well. Even if two SDRAM types have the same number, as in the case of the 240-pin DDR2 and DDR3, they can't be switched to fit each other's sockets because their "voltage keys" (indents separating the pins) are positioned differently.


With the DDR2's voltage key is near the center while DDR3's nearer to the left. The small outline DIMMs or SO-DIMMs and MicroDIMMs are just the smaller versions. Being more compact, they're more apt for use in devices that use less power such as laptops, sub-notebooks, network printers and routers. The fully buffered DIMM (FB-DIMMs), on the other hand, can be considered the elite version of the DIMM format. The most obvious difference that you'd see is that FB-DIMMS have lower pin count. But what really sets it apart from the mainstream SDRAM form factors is that it has an advanced memory buffer (AMB) that sends out signals among the controller, memory devices, and other modules without compromising its integrity and speed. It's also equipped with a cyclic redundancy check (CRC) to lessen transmission errors, making it the ideal SDRAM format for servers, critical networking equipment and high-end desktop computers.

Memory Speed349-PC_Memory > G.skill_Memory


SDRAMs have coded monickers that may be enough to turn you off, specially if you don't know how to read them. To understand these codes, you must first know that SDRAMs have a "friendly" name and a corresponding industry name, both of which describes the memory's specs. The friendly name starts with the SDRAM type, like "DDR-", "DDR2-", or "DDR3-" followed by the numerical value of its data rate or bandwidth per second. The industry name, on the other hand, starts out with "PC-", "PC2-", or "PC3-" (which corresponds to DDR, DDR2, and DDR3, respectively), followed by the peak transfer rate which is usually eight times the bandwidth per second. So for example, a DDR3 has the friendly name "DDR3-800", its industry name will then be "PC3-6400".


There are instances however, that SDRAM manufacturers round down the peak transfer rate in the industry name to make it look nicer. For example, DDR3-1066 has a peak transfer rate of 8533MBps, yet its industry name is just PC3-8500. But as mentioned before, faster isn't always better when it comes to PC memory. In simple terms, the clock speed can be described as how fast the memory can perform a task. However, there's also CAS latency (Column Access Strobe) which is how long it takes for the memory to go from one task to another. This means that sometimes, even a high-speed SDRAM with a high CAS latency can be trumped by a slower SDRAM with a lower CAS latency. Current DDR3s have relatively higher latencies (7-9) compared to DDR2s (4-6) but this is because the latter has had time to mature.

Memory Kits


While using one SDRAM may be sufficient for most applications, memory-intensive programs such as games will require more than one. This is where adapting a dual- or even triple-channel architecture becomes handy. You may compare it to having two or three roads leading to the same location instead of just one. More roads will mean less traffic congestion and therefore, faster travel. However, some using the multiple-channels will you require you to buy SDRAMs with identical specs, otherwise, the faster one will have to slow down to match the other SDRAM's speed - that is, if your motherboard will allow the use of mismatched SDRAMs, at all.

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