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Comparison Intel Core i7 Coffee Lake i7-8700K BOX vs Intel Core i7 Skylake-X i7-7820X BOX

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Intel Core i7 Coffee Lake i7-8700K BOX
Intel Core i7 Skylake-X i7-7820X BOX
Intel Core i7 Coffee Lake i7-8700K BOXIntel Core i7 Skylake-X i7-7820X BOX
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Main
Unlocked multiplier. 12 streams. Integrated video core.
SeriesCore i7Core i7
Code nameCoffee LakeSkylake-X
SocketIntel LGA 1151 v2Intel LGA 2066
Lithography14 nm14 nm
In boxBOX (no cooler)BOX (no cooler)
Cores and Threads
Cores6 cores8 cores
Threads12 threads16 threads
Multithreading
Speed
Clock speed3.7 GHz3.6 GHz
TurboBoost / TurboCore4.7 GHz4.3 GHz
TurboBoost Max 3.04.5 GHz
Cache
L1 cache512 KB
L2 cache8192 KB
L3 cache12 MB11 MB
Specs
IGPUHD Graphics 630is absent
Front side bus8 GT/s8 GT/s
TDP95 W140 W
Instruction
MMX, SSE, SSE2, SSE3, SSSE3, SSE4, SSE4.1, SSE4.2, AES, AVX, AVX2 /BMI, BMI1, BMI2, F16C, FMA3, EM64T, NX, XD, VT-x, VT-d, MPX, SGX/
MMX, SSE, SSE2, SSE3, SSSE3, SSE4, SSE4.1, SSE4.2, AES, AVX, AVX2
Multiplier3736
Free multiplier
PCI Express3.0
Passmark CPU Mark15971 score(s)17489 score(s)
Geekbench 443238 score(s)42743 score(s)
Cinebench R151429 score(s)1751 score(s)
Memory
Max. RAM128 GB128 GB
Max. DDR4 speed2666 MHz2666 MHz
Channels24
Added to E-Catalogseptember 2017may 2017

Code name

This parameter characterizes, firstly, the technical process (see above), and secondly, some features of the internal structure of processors. A new (or at least updated) codename is introduced to the market with each new CPU generation; chips of the same architecture are "coevals", but may belong to different series (see above). At the same time, one generation can include both one and several code names.

Here are the most common Intel codenames today: Cascade Lake-X (10th gen), Comet Lake (10th gen), Comet Lake Refresh (10th generation), Rocket Lake (11th generation), Alder Lake (12th generation), Raptor Lake (13th generation), Raptor Lake Refresh (14th generation).

For AMD, this list includes Zen+ Picasso, Zen2 Matisse, Zen2 Renoir, Zen3 Vermeer, Zen3 Cezanne, Zen4 Raphael, Zen4 Phoenix and Zen5 Granite Ridge.

Socket

The type of connector (socket) for installing the processor on the motherboard. For normal compatibility, it is necessary that the CPU and motherboard match the socket type; before buying one and the other, this point should be clarified separately

The following sockets are relevant for Intel processors today: 1150, 1155, 1356, 2011, 2011 v3, 2066, 1151, 1151 v2, 3647, 1200, 1700, 1851.

In turn, AMD processors are equipped with the following types of connectors: <AM3/AM3+, FM2/FM2+, AM4, AM5, TR4/TRX4, WRX8.

Cores

The number of physical cores provided in the processor design. The core is the part of the processor that is responsible for executing the instruction stream. The presence of multiple cores allows the CPU to work simultaneously with several tasks, which has a positive effect on performance. Initially, each physical core was intended to operate with one thread of commands, and the number of threads corresponded to the number of cores. However, today there are many processors that support multi-threading technologies and are capable of executing two streams of commands on each core at once. For more information about this, see “Amount of threads”.

Desktop processors have 2 cores (2 threads), as a rule, typical for budget models. 2 cores (4 threads) and 4 cores are typical for inexpensive mid-class solutions. 4 cores (8 threads), 6 cores, 6 cores (12 threads), 8 cores - a strong mid-range. 8 cores (16 threads), 10 cores, 12 cores, 16 cores and more are characteristic features of advanced models, including processors for servers and workstations.

At the same ti...me, it is worth considering that the actual capabilities of the CPU are determined not only by this parameter, but also by other characteristics - primarily by series and generation / architecture (see the corresponding paragraphs). It is not uncommon for situations where a more advanced and/or new dual-core processor turns out to be more powerful than a quad-core chip from a more modest series or an earlier architecture. So it makes sense to compare CPUs by the number of cores within the same series and generation.

Threads

The number of instruction streams that the processor can execute at the same time.

Initially, each physical core (see "Number of cores") was intended to execute one thread of instructions, and the number of threads corresponded to the number of cores. However, there are many processors today that support Hyper-threading or SMT (see below) and can run two threads on each core at once. In such models, the number of threads is twice the number of cores — for example, 8 threads will be indicated in a quad-core chip.

In general, a higher number of threads, other things being equal, has a positive effect on speed and efficiency, but increases the cost of the processor.

Clock speed

The number of cycles per second that the processor produces in its normal operating mode. A clock is a single electrical impulse used to process data and synchronize the processor with the rest of the computer system. Different operations may require fractions of a clock or several clocks, but anyway, the clock frequency is one of the main parameters characterizing the performance and speed of the processor — all other things being equal, a processor with a higher clock frequency will work faster and better cope with significant loads. At the same time, it should be taken into account that the actual performance of the chip is determined not only by the clock frequency, but also by a number of other characteristics — from the series and architecture (see the relevant paragraphs) to the number of cores and support for special instructions. So it makes sense to compare by clock frequency only chips with similar characteristics belonging to the same series and generation.

TurboBoost / TurboCore

The maximum processor clock speed that can be reached when running in Turbo Boost or Turbo Core overclocking mode.

The name "Turbo Boost" is used for the overclocking technology used by Intel, "Turbo Core" for the solution from AMD. The principle of operation in both cases is the same: if some cores are not used or work under a load below the maximum, the processor can transfer part of the load from the loaded cores to them, thus increasing computing power and performance. Operation in this mode is characterized by an increase in the clock frequency, and it is indicated in this case.

Note that we are talking about the maximum possible clock frequency — modern CPUs are able to regulate the operating mode depending on the situation, and with a relatively low load, the actual frequency may be lower than the maximum possible. See "Clock frequency" for the general meaning of this parameter.

TurboBoost Max 3.0

Processor clock speed when running in TurboBoost Max 3.0 overclocking mode.

This mode is a kind of add-on over the original Turbo Boost (see above). The basic principle of its operation is that the most critical and "heavy" tasks are sent for execution to the fastest and most unloaded processor cores. This provides additional optimization of the CPU and increases its speed. As in normal Turbo Boost mode, the clock speed increases when using this function, so it is indicated separately.

L1 cache

The amount of Level 1 (L1) cache provided by the processor.

Cache is an intermediate memory buffer into which the most frequently used data from RAM is written when the processor is running. This speeds up access to them and has a positive effect on system performance. The larger the cache, the more data can be stored in it for quick access and the higher the performance. Level 1 cache has the highest performance and the smallest volume — up to 128 KB. It is an integral part of any processor.

L2 cache

The amount of Level 2 (L2) cache provided by the processor.

Cache is an intermediate memory buffer into which the most frequently used data from RAM is written during processor operation. This speeds up access to them and has a positive effect on system performance. The larger the cache, the more data can be stored in it for quick access and the higher the performance. Level 2 cache volume can reach 12 MB, the vast majority of modern processors have such a cache.
Intel Core i7 Coffee Lake often compared
Intel Core i7 Skylake-X often compared