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** Level 0 (L0), [[micro-operation]]s cache{{dash}}6,144 bytes (6 KiB{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}})<ref>{{cite web|url=http://www.anandtech.com/show/6355/intels-haswell-architecture/6 |title=Intel's Haswell Architecture Analyzed: Building a New PC and a New Intel |publisher=AnandTech |access-date=2014-07-31}}</ref> in size
** Level 1 (L1) [[Opcode|instruction]] cache{{dash}}128 KiB{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size
** Level 1 (L1) data cache{{dash}}128 KiB{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size. Best access speed is around 700 [[Gigabyte|GB]]/s.<ref name=sisd_qa_f_mem_hsw>{{cite web|url=http://www.sisoftware.co.uk/?d=qa&f=mem_hsw |title=SiSoftware Zone |publisher=Sisoftware.co.uk |access-date=2014-07-31|archive-url=https://web.archive.org/web/20140913231938/http://www.sisoftware.co.uk/?d=qa&f=mem_hsw|archive-date=2014-09-13}}</ref>
** Level 2 (L2) instruction and data (shared){{dash}}1 [[MiB]]{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size. Best access speed is around 200 GB/s.<ref name=sisd_qa_f_mem_hsw />
** Level 3 (L3) shared cache{{dash}}6 MiB{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size. Best access speed is around 100 GB/s.<ref name=sisd_qa_f_mem_hsw />
** Level 4 (L4) shared cache{{dash}}128 MiB{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size. Best access speed is around 40 GB/s.<ref name=sisd_qa_f_mem_hsw />
* [[Computer memory|Main memory]] ([[primary storage]]){{dash}}[[GiB]]{{cn|reason=No source provided for IEC units, sources only use metric units like KB, MB, GB, etc|date=May 2021}}{{Original research inline|certain=y|date=May 2021}} in size. Best access speed is around 10 GB/s.<ref name=sisd_qa_f_mem_hsw /> In the case of a [[Non-Uniform Memory Access|NUMA]] machine, access times may not be uniform.
* [[Disk storage]] ([[secondary storage]]){{dash}}[[terabyte]]s in size. {{As of|2017}}, best access speed is from a consumer [[Solid-state drive|solid state drive]] is about 2000 MB/s.<ref>{{cite web|url=http://www.storagereview.com/samsung_960_pro_m2_nvme_ssd_review|title=Samsung 960 Pro M.2 NVMe SSD Review|date=20 October 2016 |publisher=storagereview.com|access-date=2017-04-13}}</ref>
* [[Nearline storage]] ([[tertiary storage]]){{dash}}up to [[exabytes]] in size. {{As of|2013}}, best access speed is about 160 MB/s.<ref>{{cite web |url=http://www.lto.org/technology/generations.html |title=Ultrium – LTO Technology – Ultrium GenerationsLTO |publisher=Lto.org |access-date=2014-07-31 |url-status=dead |archive-url=https://web.archive.org/web/20110727052050/http://www.lto.org/technology/generations.html |archive-date=2011-07-27 }}</ref>
* [[Offline storage]]
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