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cisc vs risc
A few years ago we had the RISC processors. Used by apple and sun. These
processors used to be more powerful at the time than the Cisc tech. What happened to risc cpu's? MS |
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cisc vs risc
MS wrote:
A few years ago we had the RISC processors. Used by apple and sun. These processors used to be more powerful at the time than the Cisc tech. What happened to risc cpu's? MS Lack of development?? |
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cisc vs risc
What happened to risc cpu's?
http://en.wikipedia.org/wiki/Risc#Later_RISC Today the vast majority of all 32-bit CPUs in use are RISC CPUs, and microcontrollers. RISC design techniques offers power in even small sizes, and thus has become dominant for low-power 32-bit CPUs. Embedded systems are by far the largest market for processors: while a family may own one or two PCs, their car(s), cell phones, and other devices may contain a total of dozens of embedded processors. RISC had also completely taken over the market for larger workstations for much of the 90s (until taken back by inexpensive PC-based solutions). After the release of the Sun SPARCstation the other vendors rushed to compete with RISC based solutions of their own. The high-end server market today is almost completely RISC based[citation needed], and the #1 spot among supercomputers as of 2008[update] is held by IBM's Roadrunner system, which uses Power Architecture-based Cell processors[10] to provide most of its computing power, although many other supercomputers use x86 CISC processors instead. --g |
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cisc vs risc
Today the vast majority of all 32-bit CPUs in use are RISC CPUs, and
microcontrollers. RISC design techniques offers power in even small sizes, and thus has become dominant for low-power 32-bit CPUs. Embedded systems are Intel and AMD are CISC? -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (Ubuntu 9.04) Linux 2.6.29.4 ^ ^ 13:21:02 up 9 days 1:24 2 users load average: 1.23 1.29 1.25 ???! ???! ???! ???! ???! ???! ????? (CSSA): http://www.swd.gov.hk/tc/index/site_...sub_addressesa |
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cisc vs risc
* MS:
A few years ago we had the RISC processors. Used by apple and sun. These processors used to be more powerful at the time than the Cisc tech. What happened to risc cpu's? Well, at the times you are talking about there was a more clear distinction what RISC (Reduced Instruction Set Computing) and CISC (Complex Instruction Set Computing) is. A lot has changed. First, RISC processors got more complicated over time, with more complicated instruction sets. On the other side, x86 became more RISC-like with the Pentium and later processors. Today the complexity of x86 and most "RISC" processors is quite similar. Second, traditional RISC platforms (SUN SPARC, IBM POWER/PowerPC, SGI MIPS, HP PA-RISC) have been declining for the last decade. The reason is that while x86 was slow and limited say 15 years from today it did benefit from faster development and lower costs, outperforming traditional RISC in more and more areas. Today the traditional RISC workstations from Sun, SGI and HP are gone, Apple also has abandoned the PowerPC in favour of the faster intel Core. HP killed PA-RISC in favour of IA64 (Itanium) which also is declining. MIPS and PowerPC are now mostly used in the Embedded market, and IBM POWER and Sun SPARC are left with the high end server/mainframe market, something which sooner or later also will be overtaken from x86. Benjamin |
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cisc vs risc
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cisc vs risc
* Peter:
If I'm not mistaken, isn't the cell chip/processor found in the Playstation 3 supposed to be RISC, as well as multi-core? Yes, the PS3 as the XBox uses a "RISC" CPU, both are PowerPC based. But while the Xenon is a common symmetric multicore (like AMD Phenom or intel Core 2) the Cell is a asymmetric processor (one general purpose processing core and multiple special purpose coprocessor elements). But these processors are not more "RISC" than Phenom or intel Core 2. Benjamin |
#8
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cisc vs risc
On May 29, 2:08 pm, "MS" wrote:
A few years ago we had the RISC processors. Used by apple and sun. These processors used to be more powerful at the time than the Cisc tech. What happened to risc cpu's? MS Whatever else it isn't (what it is), an emphasis on pragmatics will outweigh all else -- the loss of latent benefits, ie Microsoft antitrust trust settlements at some divergence from being (what is not IBM) dedicated to a garage/cottage industry of residential computer tinkerers, as well, within an established framework of the business of revolution known for the Personal Computer phenomena. Let me see if I can "spit" that any better... A premise DOS superceded, as it does *NIX variants, by in large analogous, while within a purvey of [X]XX86 instruction sets, no less biased to programs of old, as they are to the present;- whether that is from a computer architect's standpoint debilitating, is an argument less persuasive, than any affect substantially at variance from said pragmatics, when push comes to play (while not shove) upon a matrix indeed being implemented. Hm... perhaps a little less discrete datum from Stanford's computer dept., although I do not know that it does, in fact, affect an outcome: RISC pragmatically once assayed from predominately AMD and the home PC owner. Or, perhaps, I'm simply no less ignorant, as apparently your are, of greater CISC factors seen as a motivational impetus behind business modeling, then to impart a significance in the presence of "state of the art" multicore platforms... CISC / RISC Emphasis on hardware / Emphasis on software Includes multi-clock complex instructions / Single-clock, reduced instruction only Memory-to-memory: "LOAD" and "STORE" incorporated in instructions / Register to register: "LOAD" and "STORE" are independent instructions Small code sizes, high cycles per second / Low cycles per second, large code sizes Transistors used for storing complex instructions / Spends more transistors on memory registers |
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