Intel Core i7-3820 vs Intel Core i7-7700K

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Core i7-3820 compared with Core i7-7700K

	IntelCore i7-3820	IntelCore i7-7700K
Overview
Released
Released	February 2012	January 2017
Cores and clocks
Cores
Cores	4	4
Threads
Threads	8	8
Base clock
Base clock	3.6 GHz	4.2 GHz
Boost clock
Boost clock	3.8 GHz	4.5 GHz (better)
L3 cache
L3 cache	10 MB (better)	8 MB
Cores
Cores	Four cores and eight threads; Sandy Bridge-E with Hyper-Threading. The multiplier is only partly unlocked, as both exact reviews explain; unlocked is false here because it is not fully unlocked.	Four cores with Hyper-Threading; Intel Turbo Boost 2.0 supported.
Clocks
Clocks	Turbo Boost 2.0 up to 3.80 GHz from Intel’s current sheet; KitGuru’s engineering-sample review table instead states 3.90 GHz. Intel staff acknowledged release in February 2012; month precision is retained rather than treating the forum’s proposed day as verified sale.	Maximum turbo is a single-core frequency; overclocking requires an appropriate motherboard and cooling. Intel publishes TDP without a separate maximum turbo-power figure.
Cache
Cache	10 MB Intel Smart Cache; L3 level confirmed by both exact reviews.	–
Graphics and AI
Built-in graphics
Built-in graphics	No	Yes
Graphics
Graphics	No integrated graphics or Quick Sync, confirmed by KitGuru’s exact-model review.	Intel HD Graphics 630; 350 MHz base, up to 1.15 GHz; three displays; Quick Sync Video. Hardware HEVC 10-bit encode and decode, and VP9 10-bit decode, according to Intel's desktop product brief.
Platform
Socket
Socket	LGA2011	LGA1151
Base power
Base power	130 W	91 W
Unlocked
Unlocked	No	Yes
Cooler in the box
Cooler in the box	No	No
Memory support
Memory support	Four channels of DDR3-1066/1333/1600; 51.2 GB/s maximum published bandwidth; no ECC. Intel’s anomalous 64.23 GB maximum-memory value is not normalised into a guessed capacity.	Up to 64 GB; two channels; DDR4-2133/2400 or DDR3L-1333/1600 at 1.35 V; ECC not supported.
PCIe
PCIe	40 CPU lanes; Intel’s current sheet lists PCIe 2.0, while both contemporary reviews describe PCIe 3.0 capability. The manufacturer’s current literal figure is retained with this conflict explicit.	PCIe 3.0; 16 CPU lanes, configured as 1×16, 2×8 or 1×8+2×4.
Chipsets
Chipsets	Intel X79; LGA2011.	–
Process
Process	32 nm; Sandy Bridge-E.	14 nm; Kaby Lake; 37.5 × 37.5 mm package; 100°C maximum junction temperature. Intel describes the manufacturing process as 14 nm+ in its product brief.
Cooler
Cooler	Exact BX80619I73820 Newegg listing states cooling device not included. Intel gives a case-temperature limit of 66.8°C.	Boxed processor includes no fan or heatsink. Intel announced the desktop family on 3 January 2017; TechSpot's contemporaneous launch review confirms availability that day.