The time required to discharge a capacitor thus depends on what logic value is stored in the capacitor. A capacitor containing logic one begins to discharge when the voltage at the access transistor's gate terminal is above VCCP. If the capacitor contains a logic zero, it begins to discharge when the gate terminal voltage is above VTH.
Typically, it is found in 60 ns or 70 ns versions. You cannot mix different speeds on the same Pentium system board. Data are read faster. A 50 ns version is available at higher cost. It is especially used in servers.
It comes only in 64 bit modules long pin DIMM. SDRAM has a rise time of only ns. Normally you figure 8 bits to one byte. For many years, a ninth bit has been added as parity bit in the RAM blocks to verify correct transmission.
That way you have to transmit 9 bits, to store 8 bits in the old 30 pin RAM chips. And it takes 36 bits to store 32 bits in the larger 72 pin chips.
If your system board requires 36 bit modules, you must respect that.
Fortunately, most system boards accepts 32 bit modules, so this creates no problems. RAM is controlled by the chip set on the system board, so you must install a type, which matches your system board. Furthermore, RAM chips come in different sizes, which must match the system board. There was usually room for 36 small chips on the system board.
That made it cumbersome to install new RAM. Then, someone figured out to install RAM chips on cards, which are easily installed.
First came the SIPP modules.
They had multiple pins, which fit in the system board. Since came the SIMM modules. They are mounted on a card, which has an edge connector. They fit in sockets on the system board, and anyone can install them. The fewer ns, the faster is the RAM. Years ago, RAM came inand 80 ns.
Today, we are talking about 60 ns and faster. It becomes complicated to describe the relationship between RAM speed and the ability of the system bus to utilize fast RAM.
They were connected to the system board with a 30 pin edge connector. The modules were 8 bit wide. Thus, there was room for two modules in what is called a bank. If you only had one bank with room for 4 modulesit was expensive to increase the RAM, because you had to discard the old modules.
Then the larger 32 bit modules came into use. A system board could still have 4 SIMM sockets, but when the modules were 32 bit wide, they could be installed one at a time. This was quite ingenious. You could add different types of modules and still use the old ones. Also, since the system board ran at only 33 MHz on the system bus, the RAM module quality was not so critical.
You could mix 60 ns and 70 ns modules of different brands without problems.
Looking at just the bit modules, we find modules with 2, 4, 8 or chips on each side. There are chips on both sides of the module. All these chips 16 Mbit ones. All modules must have the same speed. They have a pin edge connector. They fit only in the newer system boards. Since the DIMM modules are 64 bits wide, you can install one module at a time.
They are available in 8, 16, 32, 64, and MB, with 8, 10, and 12 ns speed.RAM (Random Access Memory) is the hardware in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device's processor.
RAM is the main memory in a computer, and it is much faster to read from and write to than. RAM is basically a computer's short-term memory, it temporarily stores the information a program requires to run while it is running.
RAM runs at a very high speed when compared to hard-drive. RAM (Random Access Memory) and ROM (Read Only Memory) are types of computer memory that provide users with access to information stored on a computer.
Here are the top five differences between the two types of memory. Provides detailed reference material for using SAS/STAT software to perform statistical analyses, including analysis of variance, regression, categorical data analysis, multivariate analysis, survival analysis, psychometric analysis, cluster analysis, nonparametric analysis, mixed-models analysis, and survey data analysis, with numerous examples in addition to syntax and usage information.
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