Intel Core i7-3820 vs Intel Core i7-875K

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Core i7-3820 compared with Core i7-875K

	IntelCore i7-3820	IntelCore i7-875K
Overview
Released
Released	February 2012	June 2010
Cores and clocks
Cores
Cores	4	4
Threads
Threads	8	8
Base clock
Base clock	3.6 GHz	2.93 GHz
Boost clock
Boost clock	3.8 GHz (better)	3.6 GHz
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 and eight threads with Hyper-Threading; unlocked multiplier confirmed in both exact 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.	2.93 GHz base and up to 3.60 GHz Turbo Boost. Intel’s exact comparison chart gives Q2 2010. The 28 May review/announcement precedes the June retail availability documented by AKIBA PC Hotline; month precision is retained because a maker-confirmed first-sale day was not found.
Cache
Cache	10 MB Intel Smart Cache; L3 level confirmed by both exact reviews.	8 MB shared L3 cache.
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.	Intel’s exact-model chart lists no processor graphics.
Platform
Socket
Socket	LGA2011	LGA1156
Base power
Base power	130 W	95 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.	DDR3-1333 rated maximum in Intel’s exact chart; two-channel memory confirmed by bit-tech’s exact review.
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.	16 PCIe 2.0 lanes in PC Perspective’s exact-model review introduction.
Chipsets
Chipsets	Intel X79; LGA2011.	–
Process
Process	32 nm; Sandy Bridge-E.	45 nm; Lynnfield.
Cooler
Cooler	Exact BX80619I73820 Newegg listing states cooling device not included. Intel gives a case-temperature limit of 66.8°C.	The exact Newegg listing and contemporary AKIBA PC Hotline retail report confirm that the boxed model has no cooler.