Intel Core i5-2500K vs Intel Core i7-875K

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Core i5-2500K compared with Core i7-875K

	IntelCore i5-2500K	IntelCore i7-875K
Overview
Released
Released	January 2011	June 2010
Cores and clocks
Cores
Cores	4	4
Threads
Threads	4	8 (better)
Base clock
Base clock	3.3 GHz	2.93 GHz
Boost clock
Boost clock	3.7 GHz (better)	3.6 GHz
L3 cache
L3 cache	6 MB	8 MB (better)
Cores
Cores	Four cores without Hyper-Threading; Intel Turbo Boost 2.0 and VT-x supported; VT-d not supported.	Four cores and eight threads with Hyper-Threading; unlocked multiplier confirmed in both exact reviews.
Clocks
Clocks	Maximum turbo is a single-core frequency. The multiplier is unlocked, but motherboard support and cooling determine available overclocking; the original H67 platform does not support CPU multiplier overclocking.	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	–	8 MB shared L3 cache.
Graphics and AI
Built-in graphics
Built-in graphics	Yes	No
Graphics
Graphics	Intel HD Graphics 3000; 850 MHz base, up to 1.10 GHz; two displays; Quick Sync Video. Available display outputs and access to integrated graphics depend on the motherboard.	Intel’s exact-model chart lists no processor graphics.
Platform
Socket
Socket	LGA1155	LGA1156
Base power
Base power	95 W	95 W
Unlocked
Unlocked	Yes	Yes
Cooler in the box
Cooler in the box	–	No
Memory support
Memory support	Up to 32 GB; two channels; DDR3-1066/1333; 21 GB/s maximum bandwidth as published by Intel; ECC not supported.	DDR3-1333 rated maximum in Intel’s exact chart; two-channel memory confirmed by bit-tech’s exact review.
PCIe
PCIe	PCIe 2.0; up to 16 CPU lanes. Motherboard support determines available slot configurations.	16 PCIe 2.0 lanes in PC Perspective’s exact-model review introduction.
Process
Process	32 nm; Sandy Bridge; 37.5 × 37.5 mm package; 72.6°C Tcase limit, not a junction-temperature limit.	45 nm; Lynnfield.
Cooler
Cooler	LGA1155-compatible cooling required. Intel's 5 January 2011 announcement gives 9 January availability for quad-core systems; APH Networks' contemporaneous exact-model review also identifies 9 January as the processor's release date.	The exact Newegg listing and contemporary AKIBA PC Hotline retail report confirm that the boxed model has no cooler.