Intel Core i7-7740X vs Intel Core i7-7820X

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Core i7-7740X compared with Core i7-7820X

	IntelCore i7-7740X	IntelCore i7-7820X
Overview
Released
Released	June 2017	June 2017
Cores and clocks
Cores
Cores	4	8 (better)
Threads
Threads	8	16 (better)
Base clock
Base clock	4.3 GHz	3.6 GHz
Boost clock
Boost clock	4.5 GHz	4.5 GHz
L3 cache
L3 cache	8 MB	11 MB (better)
Cores
Cores	Kaby Lake-X with Hyper-Threading; unlocked core multiplier confirmed by KitGuru’s exact-model technical table and overclocking test.	Skylake-X; 8 cores with Hyper-Threading. The unlocked multiplier is confirmed by Intel’s exact-model family product brief.
Clocks
Clocks	Turbo Boost 2.0 up to 4.50 GHz; no Turbo Boost Max 3.0 in Intel’s exact comparison-chart row. Intel’s press-kit record names 26 June 2017 availability for the first Core X processors, and its August record confirms the four- to ten-core models were already on shelves; conservative month precision is retained.	Turbo Boost Max 3.0 up to 4.50 GHz on the preferred core; ordinary Turbo Boost 2.0 up to 4.30 GHz. The main boost field uses Intel’s highest published frequency. Intel’s September press-kit record names 26 June 2017 availability for the first Core X processors; its August record confirms the four- to ten-core models were already on shelves. The exact model’s first-sale day was not established, so month precision is retained.
Cache
Cache	8 MB cache; L3 designation confirmed by KitGuru’s exact-model table.	11 MB Intel Smart Cache (L3).
Graphics and AI
Built-in graphics
Built-in graphics	No	No
Graphics
Graphics	No processor graphics, explicitly confirmed by Intel’s exact-model comparison chart.	No processor graphics, explicitly stated in Intel’s exact-model comparison-chart row; a separate graphics solution is required.
Platform
Socket
Socket	LGA2066	LGA2066
Base power
Base power	112 W	140 W
Unlocked
Unlocked	Yes	Yes
Cooler in the box
Cooler in the box	No	No
Memory support
Memory support	Up to 64 GB; two channels of DDR4-2666; 42 GB/s maximum published bandwidth; no ECC.	Up to 128 GB; four channels of DDR4-2666; 85 GB/s maximum published bandwidth; no ECC.
PCIe
PCIe	16 CPU PCIe lanes; up to 1×16, 2×8 or 1×8 plus 2×4.	28 CPU lanes; PCIe 3.0.
Chipsets
Chipsets	Intel X299; LGA2066.	Intel X299; LGA2066.
Process
Process	14 nm; Kaby Lake-X.	14 nm; Skylake-X.
Cooler
Cooler	Intel excludes a fan and heatsink from the boxed product; junction limit 100°C.	Intel explicitly excludes a fan and heatsink from the boxed product; a separate compatible cooler is required. Published junction limit: 99°C.