What is L1 Cache L2 and L3 what do these do?
I want to know what L1 L2 and L3 cache is
- 1 decade agoFavorite Answer
cache memory is a high speed memory kept in between processor and RAM to increase the data execution speed. It is kept near to the processor.
There are different levels of cache.
L1-cache is the fastest cache and it usually comes within the processor chip itself.
The L1 cache typically ranges in size from 8KB to 64KB and uses the high-speed SRAM (static RAM) instead of the slower and cheaper DRAM (dynamic RAM) used for main memory.
The Intel Celeron processor uses two separate 16KB L1 caches, one for the instructions and one for the data.
L2 cache comes between L1 and RAM(processor-L1-L2-RAM) and is bigger than the primary cache (typically 64KB to 4MB).
L3 cache is not found nowadays as its function is replaced by L2 cache. L3 caches are found on the motherboard rather than the processor. It is kept between RAM and L2 cache.
So if your system has L1,L2 and L3 cache data fetching will be L1->L2->L3->RAM
ie. If data is not there in L1 it will check L2 then L3 then RAM..
- Anonymous1 decade ago
A CPU cache is a cache used by the central processing unit of a computer to reduce the average time to access memory. The cache is a smaller, faster memory which stores copies of the data from the most frequently used main memory locations. As long as most memory accesses are to cached memory locations, the average latency of memory accesses will be closer to the cache latency than to the latency of main memory.
Multi-level caches generally operate by checking the smallest Level 1 (L1) cache first; if it hits, the processor proceeds at high speed. If the smaller cache misses, the next larger cache (L2) is checked, and so on, before external memory is checked.
As the latency difference between main memory and the fastest cache has become larger, some processors have begun to utilize as many as three levels of on-chip cache. For example, in 2003, Itanium 2 began shipping with a 6 MiB unified level 3 (L3) cache on-chip. The IBM Power 4 series has a 256 MiB L3 cache off chip, shared among several processors. The new AMD Phenom series of chips carries a 2MB on die L3 cache.
BrotherSoft SupportSource(s): http://en.wikipedia.org
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- 1 decade ago
"The cache is a very high speed and very expensive piece of memory, which is used to speed up the memory retrieval process."
See sources.Source(s): http://www.pantherproducts.co.uk/Articles/CPU/CPU%... http://en.wikipedia.org/wiki/CPU_cache#Multi-level...
- LauraLv 44 years ago
I suggest very strongly that you use a search engine.