Intel Core i7-3820 vs Intel Core i7-4820K

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Core i7-3820 compared with Core i7-4820K

	IntelCore i7-3820	IntelCore i7-4820K
Overview
Released
Released	February 2012	September 2013
Cores and clocks
Cores
Cores	4	4
Threads
Threads	8	8
Base clock
Base clock	3.6 GHz	3.7 GHz
Boost clock
Boost clock	3.8 GHz	3.9 GHz (better)
L3 cache
L3 cache	10 MB	10 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.	Ivy Bridge-E; 4 cores with Hyper-Threading. The unlocked multiplier is confirmed by the exact-model reviews.
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.	Turbo Boost 2.0 up to 3.90 GHz. September availability follows Hardware Canucks’ contemporary report of widespread store availability and Intel’s Q3 2013 launch quarter; an exact maker first-sale day was not established.
Cache
Cache	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 integrated graphics or Quick Sync, confirmed by KitGuru’s exact-model review.	No processor graphics, confirmed by Intel’s exact-model comparison-chart row; a separate graphics solution is required.
Platform
Socket
Socket	LGA2011	LGA2011
Base power
Base power	130 W	130 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; four channels of DDR3-1333/1600/1866; maximum bandwidth 59.7 GB/s; no ECC.
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.	40 CPU lanes; PCIe 3.0
Chipsets
Chipsets	Intel X79; LGA2011.	X79 and LGA2011, confirmed by the exact-model reviews.
Process
Process	32 nm; Sandy Bridge-E.	22 nm; Ivy Bridge-E. Package size 52.5 × 45.0 mm.
Cooler
Cooler	Exact BX80619I73820 Newegg listing states cooling device not included. Intel gives a case-temperature limit of 66.8°C.	Intel explicitly excludes a fan and heatsink from the boxed product; a separate compatible cooler is required.