Intel Core i7-14700K vs Intel Core i7-3820

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Core i7-14700K compared with Core i7-3820

	IntelCore i7-14700K	IntelCore i7-3820
Overview
Released
Released	October 2023	February 2012
Cores and clocks
Cores
Cores	20 (8 performance, 12 efficiency) (better)	4
Threads
Threads	28 (better)	8
Base clock
Base clock	3.4 GHz	3.6 GHz
Boost clock
Boost clock	5.6 GHz (better)	3.8 GHz
L3 cache
L3 cache	33 MB (better)	10 MB
Cores
Cores	8 Performance-cores and 12 Efficient-cores, with Hyper-Threading; codename Raptor Lake	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	P-core base 3.4 GHz, max turbo 5.5 GHz; E-core base 2.5 GHz, max turbo 4.3 GHz; Turbo Boost Max 3.0 5.6 GHz	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	33 MB Intel Smart Cache (L3); 28 MB L2	10 MB Intel Smart Cache; L3 level confirmed by both exact reviews.
Graphics and AI
Built-in graphics
Built-in graphics	Yes	No
Graphics
Graphics	Intel UHD Graphics 770, 32 execution units, up to 1.6 GHz; outputs eDP 1.4b, DP 1.4a, HDMI 2.1; up to 4 displays	No integrated graphics or Quick Sync, confirmed by KitGuru’s exact-model review.
Platform
Socket
Socket	LGA1700	LGA2011
Base power
Base power	125 W	130 W
Maximum power
Maximum power	253 W	–
Unlocked
Unlocked	Yes	No
Cooler in the box
Cooler in the box	–	No
Memory support
Memory support	Up to DDR5 5600 MT/s or up to DDR4 3200 MT/s; 2 channels, up to 192 GB; ECC supported	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	PCIe 5.0 and 4.0; 20 lanes (Up to 1x16+4, 2x8+4); DMI 4.0 x8	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 600 and 700 series	Intel X79; LGA2011.
Process
Process	Intel 7	32 nm; Sandy Bridge-E.
Cooler
Cooler	max operating temperature 100 °C; thermal specification PCG 2020A	Exact BX80619I73820 Newegg listing states cooling device not included. Intel gives a case-temperature limit of 66.8°C.