About: RAM limit

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The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a limited number of address bus bits, limited by the processor package or design of the system. Some of the address space may be shared between RAM, peripherals, and read-only memory. In the case of a microcontroller with no external RAM, the size of the RAM array is limited by the size of the integrated circuit die. In a packaged system, only enough RAM may be provided for the system's required functions, with no provision for addition of memory after manufacture.

Attributes	Values
rdf:type	Thing
rdfs:label	RAM limit (en)
rdfs:comment	The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a limited number of address bus bits, limited by the processor package or design of the system. Some of the address space may be shared between RAM, peripherals, and read-only memory. In the case of a microcontroller with no external RAM, the size of the RAM array is limited by the size of the integrated circuit die. In a packaged system, only enough RAM may be provided for the system's required functions, with no provision for addition of memory after manufacture. (en)
rdfs:seeAlso	3 GB barrier High memory
dct:subject	Computer memory X86 memory management DOS memory management
Wikipage page ID	21449197 (xsd:integer)
Wikipage revision ID	1076709813 (xsd:integer)
Link from a Wikipage to another Wikipage	Extended Memory Specification Pentium 4 DOS extender DOS memory management Intel 80286 Intel 8085 Intel 8086 Intel 8088 Memory bus Real mode Pentium Pro 16-bit Gary Kildall Motorola 6800 Motorola 68000 Motorola 68000 series Motorola 68020 Conventional memory MOS Technology 6507 Z80 Zilog Physical Address Extension 64-bit computing CP/M Address bus 8-bit Altair 8800 Computer memory X86 memory management DOS Protected Mode Interface Expanded Memory Specification Bank switching PL/M Microcontroller Atari 2600 High memory area Digital Research DOS memory management Intel Intel 80186 Intel 80188 Intel 8080 Operating system Random-access memory X86 Motherboard Upper memory area Virtual memory Expanded memory Extended memory Random access memory Microcomputers Intel 80386SX PIC18 VCPI
Link from a Wikipage to an external page	https://msdn.microsoft.com/en-us/library/aa366778.aspx https://support.microsoft.com/kb/929605/ https://support.microsoft.com/kb/946003/
sameAs	RAM limit RAM limit RAM limit
dbp:wikiPageUsesTemplate	dbt:Reflist dbt:See_also dbt:Short_description dbt:Snd
has abstract	The maximum random access memory (RAM) installed in any computer system is limited by hardware, software and economic factors. The hardware may have a limited number of address bus bits, limited by the processor package or design of the system. Some of the address space may be shared between RAM, peripherals, and read-only memory. In the case of a microcontroller with no external RAM, the size of the RAM array is limited by the size of the integrated circuit die. In a packaged system, only enough RAM may be provided for the system's required functions, with no provision for addition of memory after manufacture. Software limitations to usable physical RAM may be present. An operating system may only be designed to allocate a certain amount of memory, with upper address bits reserved to indicate designations such as I/O or supervisor mode or other security information. Or the operating system may rely on internal data structures with fixed limits for addressable memory. For mass-market personal computers, there may be no financial advantage to a manufacturer in providing more memory sockets, address lines, or other hardware than necessary to run mass-market software. When memory devices were relatively expensive compared with the processor, often the RAM delivered with the system was much less than the address capacity of the hardware, because of cost. Sometimes RAM limits can be overcome using special techniques. Bank switching allows blocks of RAM memory to be switched into the processor's address space when required, under program control. Operating systems routinely manage running programs using virtual memory, where individual program operate as if they have access to a large memory space that is being simulated by swapping memory areas with disk storage. (en)
gold:hypernym	Limitations
prov:wasDerivedFrom	wikipedia-en:RAM_limit?oldid=1076709813&ns=0
page length (characters) of wiki page	12458 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:RAM_limit
is Link from a Wikipage to another Wikipage of	Conventional memory PSE-36 DESQview George Morrow (computers) PCI hole RAM Limit
is Wikipage redirect of	RAM Limit
is foaf:primaryTopic of	wikipedia-en:RAM_limit

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