Denise Milani Sportswear

RAM memory, Part II

( R Andom A ccess M emory = Random Access Memory)

RAM is a type of volatile memory, meaning that the power supply is cut data is erased at the time, unlike that of eg. The hard disk memory, the data remains even if no electricity is being administered. RAM is one of the fastest memories found on a computer (the faster the memory cache), so their mission is to expedite the work of helping computer components they need in a given time to store a task, a calculation or a datum.

practical in the field are called ram memory modules, the way in which they assembled the memory chips on a rectangular board (PCB), it is called DIMM memory module (in the case of laptops that the tablet is smaller called SODIMM).

Each operating system requires a minimum of this ram to do their homework started and thus is the more modern operating system, more memory RAM minimum usually required to work in the same way, programs and resource-consuming games memory. The more RAM a computer has more programs and can perform tasks faster and thus may make the tasks a user, but considering the limitations of the motherboard, the operating system or simply not be exaggerated amounts would not be used never or almost never, for example Windows 98 and Millennium are not able to address 1GB of RAM and some motherboards are not capable of working with more than 2GB of ram, just as Windows 2000 and XP are able to address only 1.5 GB of ram it correctly, the rest can not use the operating system (but if some programs) Windows 2003 x64, Windows 64 and Windows XP Vista x64 is capable of directional up to 24GB of ram.

During the evolution of computers have been many types of RAM, and are generally classified (in addition to the module) for its speed in MHz, the following are only the latest of recent times:

SDRAM (168 pin)

Synchronize Dynamic RAM PC100: 100MHz. Time is of the Pentium II
PC133: 133MHz. Appeared with the Pentium III and was used to Not long ago in some Pentium 4
is an obsolete memory that is only used for computer upgrades and

former DDR (184 pin)
His full name is DDRSDRAM = Double Data Rate SDRAM
PC1700 200MHz (obsolete) PC2100
: 266MHz (obsolete)
PC2700: 333MHz (obsolete)
PC3200 400MHz (still making and selling usually)
still in use. Typically found in the market only the highest speed that is compatible with previous speeds

DDR2 (240 pin)
PC3200 400MHz (obsolete)
PC4200, 533MHz PC5300
: 667MHz (the most common at this time)
PC6400: 800MHz RIMM or RAMBUS

(184 and 232 contacts)

800MHz and 1066MHz. It was very fast, but due to its high price and need to be mounted in pairs remained in abeyance. This memory is loaded on the first Pentium 4.

http://www.carcomputer.si/slike/sdram.jpg

http://www.techwarelabs.com/reviews/memory/kingmaxddr400/ddr333front.jpg

As can be seen in photographs each type of memory has a notch which is simply to differentiate and that memory is not being able to click eg. DDR2 memory in DDR memory socket, as it is not.

Latency (CL)
is measured in clock cycles and the time it takes a memory to a process of writing, so that the lower the value the faster the memory.
Although a value regardless of who actually determines the speed is the memory Hz, ie it is faster 400MHz memory with a latency of 3 than a 333MHz RAM with a latency of 2.

Dual or Dual Channel DDR
consists of placing 2 parallel memories and what you get is a higher speed and performance of the ram, the 2 reports must be identical (brand, model, capacity, brand chip, ... all) but can cause problems and spoil both the memory modules. ECC


is a technology that implements Some reports and are often used in server motherboards. This memory has a circuit to detect errors in the process of accessing and correct ram (this type of error in the writing of memory is due to air ionization)

Registered
This type of memory has a buffer step for data sent to memory are continuous and therefore work in a more stable. Same as above, its use is common in server motherboards.

When a motherboard requires ECC memory and ECC Registered memory, usually only able to ride like that, because if not, will not start or fails, the same as a motherboard (eg. The plates for normal computers) does not require ECC memory, not of this type should be mounted for either will not boot or errors.

A point to bear in mind especially when extending a computer RAM memory is that type of processor is fitted with such equipment as it does not address memory in the same way computers with AMD than those with Intel , computers with Intel processors is the motherboard chipset directs memory who, on these boards often see expand the memory more comfortable because they support almost all kinds of combinations, you can get 1,2,3 or 4 modules (in ATX normal), but on computers with AMD is the processor who directs the memory, this usually gives an advantage over Intel's leading processor-memory transmission chelates is faster, but has a big problem when wanting to expand the memory (speaking of computers 754/939/940/AM2 socket) and it only supports 1.2 or 4 modules (can not put 3) and must always be equal to avoid problems and that performance is optimal, especially in the case of 4 modules.

Weekend Part 2