Intel Core 2 Duo E8400 vs Intel Core i5-655K

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Core 2 Duo E8400 compared with Core i5-655K

	IntelCore 2 Duo E8400	IntelCore i5-655K
Overview
Released
Released	January 2008	June 2010
Cores and clocks
Cores
Cores	2	2
Threads
Threads	2	4 (better)
Base clock
Base clock	3 GHz	3.2 GHz
Boost clock
Boost clock	–	3.46 GHz
L3 cache
L3 cache	–	4 MB
Cores
Cores	Wolfdale; two cores and two threads, without Hyper-Threading. Intel’s archived exact E8400 specifications are attached to the maker datasheet distributed by Mouser.	Two cores and four threads with Hyper-Threading; unlocked multiplier confirmed in the exact reviews.
Clocks
Clocks	Published operating frequency 3.00 GHz; 1333 MHz front-side bus. Intel explicitly lists no Turbo Boost, so no boost figure is supplied. Intel’s CES fact sheet specifies January 2008 availability for this exact model; TechSpot’s 1 February review confirms retail stock, with early shortages and prices above target. An exact first-sale day remains unverified.	3.20 GHz base and up to 3.46 GHz Turbo Boost. Intel gives Q2 2010; contemporary AKIBA PC Hotline reporting confirms retail availability in June. May launch coverage and an earlier listing do not establish an exact first-sale day, so month precision is retained.
Cache
Cache	6 MB shared L2 cache; no L3 figure supplied.	4 MB shared L3 cache.
Graphics and AI
Built-in graphics
Built-in graphics	No	Yes
Graphics
Graphics	No integrated graphics, explicitly confirmed by the exact BX80570E8400 Newegg listing; motherboard graphics are separate.	Intel HD Graphics at 733 MHz in Intel’s exact-model comparison chart.
Platform
Socket
Socket	LGA775	LGA1156
Base power
Base power	65 W	73 W
Unlocked
Unlocked	–	Yes
Cooler in the box
Cooler in the box	Yes	No
Memory support
Memory support	Memory and I/O transactions pass through the front-side bus and chipset, as Intel’s datasheet states; supported memory types and capacity depend on the motherboard.	Two channels of DDR3-1066/1333 in Intel’s exact-model chart.
Process
Process	45 nm; Wolfdale; LGA775; SSE4.1 support.	32 nm CPU and separate 45 nm graphics die, as described by bit-tech’s exact review.
Cooler
Cooler	Intel’s boxed-processor specification confirms a supplied cooling solution; exact BX80570E8400 listing confirms heatsink and fan. Published processor TDP is 65 W.	The exact Newegg listing and contemporary AKIBA PC Hotline retail report confirm that the boxed model has no cooler.