What is the confusedness in regards to RAM?

Most of the computer users do galore exploration before upgrading their system so they incisively know in regards to a perfectly corresponding CPU, motherboard and video card combining that will meet all their needs. But most of them fail when it comes to RAM. They just know the size of the RAM i.e. 1GB, 2GB or 4GB, but they don’t recognise what this DDR1, DDR2 or DDR3 is all about. So that’s why I came up with a idiot’s guide for buying a RAM, because it turns out that selecting the proper DDR variant is a very important factor that determines how your overall system will perform, therefore each computer user ought to be well-advised to learn it.

DDR1 Specifications

DDR-DIM (Double Data Rate DIMM or DDR DIMM), or most popularly just plain DDR. Double Data Rate interfaces provide two data transfers per differential clock. The data becomes registered when the CK goes high [the + side], and /CK goes low [the - side]. DDR1 utilizes the JEDEC usual for Double Date Rate [DDR I] SDRAM. Like all DDR RAM it is available as registered or un-buffered. Registered DIMMs are in general known as FB-DIMMs and have their address and control lines buffered in order to reduce signal loading. FB-DIMMs are substantially more pricey than un-buffered DIMMs and are in general reserved for server use. There are very few enthusiast/prosumer/gamers utilizing FB-DIMMs in their CPU’s. Un-buffered DIMMs don’t feature address lines and control line buffering, so they cost rather a bit less. However, they may be system-loading fixed and are therefore in general restricted in the number that may be fitted onto one system. You’ll find that most un-buffered DIMMs these days may only be installed on one motherboard to a greatest or most complete or best possible of 4 x 1GB. Buffered or registered DIMMs don’t have these limitations and server boards may accommodate 8 x 1GB, 16 x 1GB or more. An interesting and largely unknown aspect of un-buffered DDR DIMMs is that they are capable to operate one clock cycle quicker then FB-DIMMs.

DDR2 Specifications

DDR2 memory is the second generation in DDR memory. DDR2 begins with a speed level of 400MHz as the lowest available while the 400MHz speed is in truth the most eminent speed for DDR1. Therefore, DDR2 picks up where DDR1 leaves off. It’s a bit strange but due to dissimilar latencies a 400MHz DDR1 will outperform a 400MHz DDR2, but the vantage returns to DDR2 as soon as the speed reaches the next step 532MHz, which DDR1 cannot reach.

DDR3 Specifications

DDR3 is the third generation in DDR memory. DDR3 begins with a lowest capacity level of 800Mbps and goes up to 1600Mbps with bus speed as high as 2000MHz. Higher performance with lower power consumption is the major benefit, since operating voltage is only 1.5V for DDR3 equated to 1.8V for DDR2. Lower heat is generated, which means that schemes will run cooler. Ultimately the new technology will result in higher capacity modules: Up to 8GB modules (Using 4Gb Chips) to help lower server/workstation system costs.

Transfer Rates

Another confusedness is that RAM is for the most part referred in PC-number, so here are the Transfer Rates for the respective DDRs:

DDR1 Transfer Rate

DDR SDRAM: Double Data Rate SDRAM (DDR200, DDR266, DDR333 are standard) PC1600 (DDR-200 SDRAM); Clock Speed: 100MHz, Data Rate: 200MHz, Throughput 1600MB/s PC2100 (DDR-266 SDRAM); Clock Speed: 133MHz, Data Rate: 266MHz, Throughput 2100MB/s PC2400 (DDR-300 SDRAM); Clock Speed: 150MHz, Data Rate: 300MHz, Throughput 2400MB/s PC2700 (DDR-333 SDRAM); Clock Speed: 166MHz, Data Rate: 333MHz, Throughput 2600MB/s PC3000 (DDR-366 SDRAM); Clock Speed: 183MHz, Data Rate: 366MHz, Throughput 2900MB/s PC3200 (DDR-400 SDRAM); Clock Speed: 200MHz, Data Rate: 400MHz, Throughput 3200MB/s

DDR2 Transfer Rate

DDR2 SDRAM: Double Data Rate SDRAM II (Quad Edge Clock Rate, 1.8v signaling), Second Generation PC2-3200 (DDR2-400 SDRAM); Clock Speed: 100MHz, Data Rate: 400MHz, Throughput 3200MB/s PC2-4300 (DDR2-533 SDRAM); Clock Speed: 133MHz, Data Rate: 532MHz, Throughput 4300MB/s PC2-5300 (DDR2-667 SDRAM); Clock Speed: 167MHz, Data Rate: 667MHz, Throughput 5300MB/s PC2-5400 (DDR2-675 SDRAM); Clock Speed: 167MHz, Data Rate: 667MHz, Throughput 5400MB/s PC2-6400 (DDR2-800 SDRAM); Clock Speed: 200MHz, Data Rate: 800MHz, Throughput 6400MB/s

DDR3 Transfer Rate

DDR3 SDRAM: Double Data Rate SDRAM III (Quad Edge Clock Rate, 1.5v signaling), Third Generation PC3-6400 (DDR3-800 SDRAM); Clock Speed: 100MHz, Data Rate: 800MHz, Throughput 6.40GB/s PC3-8500 (DDR3-1066 SDRAM); Clock Speed: 133MHz, Data Rate: 1066MHz, Throughput 8.53GB/s PC3-10600 (DDR3-1333 SDRAM); Clock Speed: 166MHz, Data Rate: 1333MHz, Throughput 10.67GB/s PC3-12800 (DDR3-1600 SDRAM); Clock Speed: 200MHz, Data Rate: 1600MHz, Throughput 12.80GB/s
Now it will be in truth hard to list down which RAM best fits which motherboard. Before buying the RAM you will have to exploration your CPU manufacturer’s RAM recommendations and fit that precise type of DDR in it. You would be just as foolish in using a PC3-12800 DDR3-1600 with an AMD Sempron 2800+ as you would be to burden down your Intel QX6800 with a PC1600 DDR-200. Every CPU/chipset combo has it is proper DDR fit, and you will have to find out incisively what they are and stick to them. If you fir a slower than commended DDR to your system will terminate critical RAM functions and could slow your system.

Top Manufacturers

Here is the list of Some of the leading as buying a RAM from an unknown vender would end up in warranty issues.

Kingston

Corsair

Centon

Crucial

OCZ

Patriot

If you follow these guidelines and exhaustively exploration the proper DDR for your system, you’ll be get enjoyment from years of speedy and trouble-free computing. A little bit of study is a little price to pay!

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