First, we need to know what is DDR memory? DDR SDRAM (double data rate synchronous dynamic random access memory) is a type of memory fast computer. It works faster than the "data only" transfer rate SDRAM and double data without increasing the clock frequency. DDR RAM transfers data on both the rising and falling edges of the clock signal. It comes in various speeds and capacity and consumes less power than SDRAM conventional.

It is also very important for us that support the specification plate different memory modules. Therefore, it is very important to know the different types of DDR memory available in the market and comes from different memory manufacturers.

Types most common computer RAM used in PCs are:

• Double Data Rate DRAM (DDR)
• Double Data Rate 2 DRAM (DDR2)
• DRAM Double Data Rate 3 (DDR3)

DDR1 Memory
DDR (Double Data Rate) interfaces provide two transfers data per clock differential. The data is recorded when the CK goes high and low. Like all DDR RAM is available in social or un-buffered. DDR1 Memory has your address and control lines buffered in order to reduce the burden of the signal and is considerably more expensive than un-buffered DIMMs. DDR1 Unbuffered only can be installed on a motherboard with a maximum of 4 x 1GB. Buffered or registered DIMMs do not have these limitations and server boards can accommodate 8 x 1 GB, 16 x 1 GB or more.

DDR2
DDR2 memory, the second generation of DDR memory level begins with a speed of 400MHz, which is really the highest speed for DDR1. Now this is interesting to note that due to different latencies DDR1 400MHz serve one better than DDR2 at 400MHz, but can not compete DDR1 with DDR2 and the speed goes up (533).

DDR3
The third generation of DDR memory is DDR3 begins with a lower level of capacity of 800Mbps (400MHz) and up to 1600Mbps. It gives a higher performance with lower power consumption. DDR3 runs by two billion in transfers of data per second.

Not only is it important for us to know about RAM, but it is equally important to know about the motherboard. Without knowing the compatibility of our motherboard RAM can not find suitable for our system. It is advisable to use the memory selector or the system scanner to find href = "http://www.om-nanotech.com/"> compatible computer, and matching RAM for your system. In addition to compatibility, we compare the different brands available and their prices

IBM 4450 16GB (4 x 4096MB) 266MHz DDR1 SDRAM DIMMS $3,600.00

LOT OF TEN 2GB MEMORY 256X72 168 PIN PC100 8NS 3.3V ECC REG SDRAM RAM DIMM $2,900.00

LOT OF TEN 2GB MEMORY 256X72 168 PIN PC133 6NS 3.3V ECC REG SDRAM RAM DIMM $2,900.00

Lot of 56 IBM 2gb DDR2 SDRAM 276-PIN memory dimms 533mhz 256Mx72 41V0128 $2,000.00

LEXMARK 26B0204 X543DN 3-IN-1 MFP LV TAA + 256MB DDR SDRAM DIMM $1,935.61

Hewlett Packard 16Mb Sdram Dimm F/ Lj 4000/ 5000/8000/8100 Mopier 240/320 $150.00 **Refurbished**...

Hewlett Packard 64Mb Pc100 Sdram Dimm For Lj 4000/5000/8000/8100/Mopier 24 64MB PC100 SDRAM 100-Pin SO-DIMM...