memory capacity


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memory capacity

[′mem·rē kə′pas·əd·ē]
(computer science)

memory capacity

The total memory (RAM) that can be added to a computer depends on the address registers built into the CPU. For example, most 32-bit CPUs can address only up to 4 gigabytes (GB) of memory.

The reason the maximum capacity in a 64-bit computer is limitless for all intents and purposes (see chart below) is that 64-bit hardware manipulates (calculates, compares and copies) 64 bits, or 8 bytes, of data at a time. However, the actual memory is addressed with far fewer bits. Look up the number 64 in binary values, and note that a 64 bit register could address 16 exabytes of memory, which is 16 million terabytes. See memory.

                      Bytes       Maximum    Processed CPU     Memory   Simultaneously

   8-bit   65KB       1

  16-bit    1MB       2

  32-bit    4GB       4

  64-bit    **        8

 ** Limitless for all intents
    and purposes.  No computer can
    be built to accommodate the
    64-bit theoretical maximum.
    See  binary values.
References in periodicals archive ?
In fact, decreased working memory capacity may be one reason why math anxiety leads to poor math performance.
Working memory capacity shows only a weak relationship to differences in sight-reading skill in the new paper, says psychologist Reinhard Kopiez of Hanover University of Music and Drama in Germany.
The 2GB modules employ state-of-the-art technology that allows customers to double the total memory capacity of each enterprise server, using the same physical space of the former 1GB modules.
Working memory capacity is also associated with general measures of intelligence, such as reading comprehension and IQ scores, and also offers a window into the widespread, but not well understood, realm of internally driven thoughts.
Kingston developed the new 512MB module in conjunction with Apple and has put a lot of engineering effort into developing a module that will extend the memory capacity of the PowerBook G3 beyond any notebook," said Phong Truong, design engineer, Kingston.
The idea that you get hit in the face with positive correlations as a result of having a limited working memory capacity is very powerful," remarks psychologist Nora Newcombe of Temple University in Philadelphia.
The 576 Mb low-latency DRAM products provide a dramatic reduction in power consumption per unit of memory capacity compared with earlier products, contributing to better energy efficiency overall and helping to alleviate problems related to heat dispersion when designing network equipment.
Working memory capacity, or WMC, is the "ability to process a stream of information while engaging in a separate task or while being distracted" he said.
These 64-bit Intel Itanium 2-based workstations, designed for complex applications for HPC (high-performance computing), geophysical exploration, simulations, CAE, high-end CAD and EDA, will benefit greatly from the extra memory capacity.
It has a standard fax memory capacity of 256KB or 15 pages, which can be expanded by an additional 1MB to 75 pages or 2MB to 135 pages.
Contemporary multicore processors have a voracious appetite for memory capacity, but board layout and signal integrity issues limit the number of DIMMs on most two-socket server motherboards," observed Nathan Brookwood, research fellow at Insight 64.
Hambrick of Michigan State University wanted to look at working memory capacity, the ability to keep relevant pieces of information active in your mind.