What is the confusion about RAM?
Most computer users do some research before upgrading their system to know exactly a card combination perfectly matching CPU, motherboard and video to meet your needs. But most of them when it comes to RAM. They just know the size of 1GB RAM, ie, 2 GB or 4 GB, but do not know what this DDR1, DDR2 or DDR3 is all about. So that's why I got an idiot's guide to buying a RAM, it turns out that the selection of the proper DDR variant is a very important factor that determines the general shape of the system will perform, so that every user of computer must be well advised to learn that.
DDR1 Specifications
-DIM DDR (Double Data Rate DDR DIMM or DIMMs), or more popularly simply DDR. Double Data Rate interfaces provides two data transfers per differential clock. The data is recorded when the CK goes high [the + side], and / CK goes low [the - side]. DDR1 JEDEC standard used for Double Date Rate [DDR I] SDRAM. Like all DDR RAM is available as registered or unbuffered. Registered DIMMs are generally known as FB-DIMM and have your address and control lines buffered in order to reduce the burden of the signal. FB-DIMMs are considerably more expensive than un-buffered DIMMs and are generally reserved for server use. There are very few enthusiast / prosumer / gamers utilizing FB-DIMM on the CPU. Un-buffered DIMMs do not have address lines and control line buffer, so that cost a little less. However, the system may be limited load and therefore generally restricted in the number that can be installed on a system. You will find that most un-buffered DIMMs, these days can only be installed on a motherboard for up to 1 GB x 4. Registered Buffered DIMMs or do not have these limitations and server boards up to 8 x 1 GB, 16 x 1 GB or more. An interesting and largely unknown un-buffered DDR DIMM is that they are able to operate one clock cycle faster than the FB-DIMM.
DDR2 specifications
DDR2 memory is the second generation of DDR memory. DDR2 begins with a speed level of 400MHz as the lowest available, while the 400MHz speed is actually the highest speed for DDR1. Therefore, DDR2 picks up where DDR1 leaves. It's a bit strange, but due to different latencies a 400MHz DDR1 will outperform a 400MHz DDR2, but the advantage returns to DDR2 as soon as the speed reaches 532MHz next step, which DDR1 can not reach.
DDR3 Specifications
DDR3 is the third generation of DDR memory. DDR3 begins with a lower level of capacity of 800 Mbps and goes up to 1600Mbps with a bus speed up to 2000MHz. Higher performance with lower power consumption is the greatest benefit, since the operating voltage is only 1.5 V for DDR3 as compared with 1.8 V for DDR2. Reduce the heat is generated, which means that systems run cooler. In short, the new technology will lead to higher capacity modules: up to 8 GB Module (use 4GB chips) to help lower the server / workstation system costs.
Transfer Rates
Another confusion is that RAM is primarily concerned with PC-number, so here are the transfer rates of the different DDR:
DDR1 Transfer Rate
DDR SDRAM: Double Data Rate SDRAM (DDR200, DDR266, DDR333 are standard) PC1600 (DDR-200 SDRAM); Clock Speed: 100MHz, Data Rate: 200MHz, performance 1600MB / s PC2100 (DDR-266 SDRAM); Clock Speed: 133 MHz Data Rate: 266MHz, performance 2100MB / s PC2400 (DDR-300 SDRAM); Clock Speed: Rate 150MHz, Data: 300MHz, performance 2400MB / s PC2700 (DDR-333 SDRAM); Clock Speed: 166MHz, Data Rate: 333MHz, performance 2600MB / s PC3000 (DDR-366 SDRAM); Clock Speed: 183MHz, Data Rate: 366MHz, performance 2900MB / s PC3200 (DDR-400 SDRAM); Clock Speed: 200 MHz speed, data: 400MHz, performance 3200MB / s
DDR2 Transfer Rate
DDR2 SDRAM: Double Data Rate SDRAM II (Quad Edge Clock speed, 1.8v signaling), Second Generation PC2-3200 (DDR2-400 SDRAM); Clock Speed: 100MHz, Data Rate: 400MHz, performance 3200MB / s PC2- 4300 (DDR2 SDRAM -533) clock speed: 133MHz, Data: 532MHz, performance 4300MB / s PC2-5300 (DDR2-667 SDRAM); Clock Speed: 167Mhz speed, data: 667MHz, performance 5300MB / s PC2-5400 (DDR2-675 SDRAM); Clock Speed: 167Mhz speed, data: 667MHz, performance 5400MB / s PC2-6400 (DDR2-800 SDRAM); Clock Speed: 200 MHz speed, data: 6400MB 800MHz, performance / s
Transfer speed DDR3
DDR3 SDRAM: Double Data Rate SDRAM III (Quad Edge Clock speed, 1.5v signaling), the third generation PC3-6400 (DDR3-800 SDRAM); Clock Speed: 100MHz, Data Rate: 800MHz, performance 6.40GB / s PC3-8500 (SDRAM DDR3-1066), clock speed: 133MHz, Data: Performance 1066, 8. 53GB / s PC3-10600 (DDR3-1333 SDRAM); Clock Speed: 166MHz, Data Rate: 1333, performance 10.67GB / s PC3-12800 (DDR3-1600 SDRAM); Clock Speed: 200MHz, Data Rate: performance 1600 MHz, 12.80 GB / s
Now it will be difficult to list down RAM that best suits what the motherboard. Before buying the RAM you should investigate the recommendations of the manufacturer of the CPU RAM and fit that exact type of DDR in it. You would be so foolish in the use of a PC3-12800 DDR3-1600 with an AMD Sempron 2800 + as it would be to load the Intel QX6800 with a PC1600 DDR-200. Each combo CPU / chipset has its own set of DDR, and you should know exactly what they are and stick to them. If fir a slower rate than recommended DDR to your system RAM end critical functions and could slow down your system.
Major manufacturers
Here is list of some of the major as buying a RAM of an unknown supplier end in warranty issues.
Kingston
Corsair
Centon
Crucial
OCZ
Patriot
If you follow these guidelines and the investigation of the DDR appropriate for your system, you will enjoy years of computing quickly and without problems. A little study is a small price to pay!
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This review is from: Corsair 4 GB DDR3 notebook memory CMSO4GX3M1A1333C9 (personal computers)
Just replaced my 2 month old 15 "MacBook Pro with the new model launched i7 few days ago. So my dad was not compatible 8GB more. Only 5 months ago that the style of more expensive memory just did not last three times what it cost new RAM.
I have installed without any problem on the laptop, I started very well, works well.
Best price I found, I can not believe how cheap that I have this new laptop up to 8GB.
Edit - worked very well in my new Mac Mini 2011 and now has 8 GB.
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