Intel Core i5-7640X vs Intel Core i7-3820

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Core i5-7640X compared with Core i7-3820

	IntelCore i5-7640X	IntelCore i7-3820
Overview
Released
Released	June 2017	February 2012
Cores and clocks
Cores
Cores	4	4
Threads
Threads	4	8 (better)
Base clock
Base clock	4 GHz	3.6 GHz
Boost clock
Boost clock	4.2 GHz (better)	3.8 GHz
L3 cache
L3 cache	6 MB	10 MB (better)
Cores
Cores	Four cores and four threads; unlocked multiplier confirmed by Tom’s Hardware France’s exact-model table and overclocking test.	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.
Clocks
Clocks	Turbo Boost 2.0 up to 4.20 GHz; no Turbo Boost Max 3.0 in Intel’s exact comparison-chart row. Intel’s press-kit record names 26 June 2017 availability for the first Core X processors, and its August record confirms the four- to ten-core models were already on shelves; conservative month precision is retained.	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.
Cache
Cache	6 MB cache; L3 designation confirmed by Tom’s Hardware France’s exact-model table.	10 MB Intel Smart Cache; L3 level confirmed by both exact reviews.
Graphics and AI
Built-in graphics
Built-in graphics	No	No
Graphics
Graphics	No processor graphics, explicitly confirmed by Intel’s exact-model comparison chart.	No integrated graphics or Quick Sync, confirmed by KitGuru’s exact-model review.
Platform
Socket
Socket	LGA2066	LGA2011
Base power
Base power	112 W	130 W
Unlocked
Unlocked	Yes	No
Cooler in the box
Cooler in the box	No	No
Memory support
Memory support	Up to 64 GB; two channels of DDR4-2666; 42 GB/s maximum published bandwidth; no ECC.	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.
PCIe
PCIe	16 CPU PCIe 3.0 lanes; up to 1×16, 2×8 or 1×8 plus 2×4.	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.
Chipsets
Chipsets	Intel X299; LGA2066.	Intel X79; LGA2011.
Process
Process	14 nm; Kaby Lake-X.	32 nm; Sandy Bridge-E.
Cooler
Cooler	Intel excludes a fan and heatsink from the boxed product; junction limit 100°C.	Exact BX80619I73820 Newegg listing states cooling device not included. Intel gives a case-temperature limit of 66.8°C.