I'm not sure what "what is the avail of it" means.
The Core i7 - a quad core processor - uses local memory for each processor and a shared cache. The local memory is 256K and the shared cache is 8MB, and the shared cache uses 1MB for a local copy of all four processors' shared caches. So the memory manager only needs to look in the shared memory for something; if it's not there then it has to go out to the RAM.