hi there
i got 2 questions.
1- what is the difference between l1,l2,l3 cache memories?
2-i got p-4 1.7 ghz can i extend my cache? or simply can cache memory be extended
Lokeshdb_ms
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hi there
i got 2 questions.
1- what is the difference between l1,l2,l3 cache memories?
2-i got p-4 1.7 ghz can i extend my cache? or simply can cache memory be extended
Lokeshdb_ms
OK..............a very crude and simple explanation.............(If you need more detail, please follow up)
Cache is a memory store where data or instructions that are most likely to be used next are stored...........this makes them happen faster, and improves the performance of the machine ( in theory :D )
If you have "on chip" cache , this is good, "on core is better"................it happens faster............the smaller the value, the closer to the core it is.
I have an old machine with this fine, erect 256Kb cache memory card.............it runs like a rocket compared to its like devices............It is a PI/133 and will run within 12% of a PII/266.............but I have "developed" it for sentimental reasons.................. ;)
Basically, a "cache" is a "store" (of data) that can be readily accessed.
Cheers
I was going to try and explain it because I just took a computer orginization class which covered this in depth...
But, since its explained elsewhere... I'll just link ya.
cache levels
http://www.pccomputernotes.com/cache/cache02.htm
how cache is used between processor/cache/main memory/harddrive
http://www.pcmech.com/show/processors/715/2
AFAIK, you can't increase your cache. It is built into the processor.
Yes phish~ that is how I understand it, I was mentioning this "on board" card that I think you could get a 512Kb for...............mine has a 256Kb.............Pentium I era? This is on the MoBo, not the chip...........modern stuff is certainly chip onlyQuote:
AFAIK, you can't increase your cache. It is built into the processor.
:)
[offtopic]
Its very interesting to watch and see where processors are going.
They are moving away from clock speeds because the clocks really don't matter any more.
They are moving too fast for the rest of the system bus (main memory) to catch up...
What we'll start seeing is mulitcore processors.
AMD's 64 bit processor already has the northbridge built on chip.
Take a look at this comparison chart.... pretty fecking slick.
http://www.amd.com/us-en/Processors/...5E9494,00.html
I relize that the comparison chart is for AMDs 64 and Intels's 32bit P4 Extreme.
I had another one that showed the the intel 64 vs the amd 64...
Wish I could find it...
AFIAK, Intel's 64bit processor will not work backwards with 32bit software. AMD's will.
[/offtopic]
Yeah phish~ but haven't we started to see MS and the like trying to say that they are "multiple processors"...............looks like we are heading for "interesting times"?Quote:
What we'll start seeing is mulitcore processors.
I sense some interesting legal battles ahead?
:D
I'm not sure how the OS will "see" the processor.
Not sure if a "dualcore processor" will show up as two independant processors?
If it is a multicore processor, its two processors, but on one chip.
If its multi processors, the it is more than one processor, each on its own chip.
I've worked with m$2k on couple of multi processor machines.
As far as I could tell... it used each processor equally. Pretty neat actually.
I mostly used it to keep my bedroom extra warm in the winter... the damn thing threw off some heat! Especially with a grid computing client running... ;)
well forks u got of the track.....
ok if cache are in form of chips, is there any extend to wich one could increase it's size.
Nowadays, the cache is built onto the processor chip.
It used to be on the motherboard.
If you want to increase the processor cache size, then you'll have to buy a processor with a larger cache size.
Just make sure that your motherboard will support the processor that you are upgrading to. If you can't upgrade your processor because the mobo is alrady supporting the maximum processor... you will need to replace both the motherboard and processor.
but what are L3 cache memory
A tip for ya... a simple search using a search engine will provide the answers to the questions you have.
http://www.webopedia.com/TERM/s/search_engine.htmlQuote:
search engine
A program that searches documents for specified keywords and returns a list of the documents where the keywords were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Alta Vista and Excite that enable users to search for documents on the World Wide Web and USENET newsgroups.
Typically, a search engine works by sending out a spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query
My personal favorite is http://www.google.com
http://www.webopedia.com/TERM/L/L3_cache.htmlQuote:
L3 cache
As more and more processors begin to include L2 cache into their architectures, Level 3 cache is now the name for the extra cache built into motherboards between the microprocessor and the main memory.
Quite simply, what was once L2 cache on motherboards now becomes L3 cache when used with microprocessors containing built-in L2 caches.
L3 cache is even covered in a link I provided earlier in the thread.
http://www.pccomputernotes.com/cache/cache02.htm