Editing intel/crystal well

{{intel title|Crystal Well}}
'''[[name::Crystal Well]]''' is the [[instance of::codename]] for the L4 cache, a discrete [[eDRAM]] silicon die, which is featured in the high-end [[Iris Pro]]-equipped [[manufacturer::Intel]] [[Haswell]] microprocessors. The eDRAM silicon die is separate from the main [[Haswell]] die but is packaged together with it. Crystal Well based processors started shipping in the third quarter of 2013.

== Details ==
Crystal Well is a true 128MB [[L4 Cache|L4$]] which could be utilized by the core itself, not just by the [[Iris Pro]]'s [[framebuffer]]. I.E. L3$ values that gets evicted go into L4$. The L4$ caches serve GPU and CPU memory accesses; memory is partitioned between the two. If the GPU is disabled, such as when a discrete GPU is installed, the L4$ will be used exclusively by the CPU.

[[Intel]] has not disclosed many technical specs regarding how the Crystal Well die communicates with the main die. Intel has stated that the cache is capable of delivering 100GB/s bandwidth (50GB/s in each direction).

Note that since {{intel|Skylake|l=arch}}, Intel has changed how the [[eDRAM]] works to act as a side cache instead of an L4 cache (see {{intel|Skylake#eDRAM_architectural_changes|l=arch}} for details).

== Processors ==
<!-- NOTE: 
           This table is generated automatically from the data in the actual articles.
           If a microprocessor is missing from the list, an appropriate article for it needs to be
           created and tagged with [[has feature::Crystal Well]] property.
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<table class="wikitable sortable">
<tr><th colspan="8" style="background:#D6D6FF;">Crystal Well Processors</th></tr>
<tr><th>Model</th><th>[[microprocessor family|Family]]</th><th>Microarchitecture</th><th>Launched</th><th>Cores</th><th>Threads</th><th>Frequency</th><th>Process</th></tr>
{{#ask:
    [[Category:microprocessor models by intel]]
    [[has feature::Crystal Well]]
 |?full page name
 |?model number
 |?microprocessor family
 |?microarchitecture
 |?first launched
 |?core count
 |?thread count
 |?base frequency
 |?process
 |format=template
 |template=proc table 1
 |mainlabel=-
 |userparam=10
}}
</table>

== See also ==
* {{intel|Iris Pro Graphics 5200}}

== External links ==
* [http://ark.intel.com/products/codename/51802/Crystal-Well Intel Crystal Well Products]


[[Category:intel]]