i9-9900X vs i7-6800K

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Aggregate performance score

Core i7-6800K
2016
6 cores / 12 threads, 140 Watt
6.76
Core i9-9900X
2018
10 cores / 20 threads, 165 Watt
13.74
+103%

Core i9-9900X outperforms Core i7-6800K by a whopping 103% based on our aggregate benchmark results.

Primary details

Comparing Core i7-6800K and Core i9-9900X processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking1034542
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation1.695.08
Market segmentDesktop processorDesktop processor
Seriesno dataIntel Core i9
Power efficiency4.577.88
Architecture codenameBroadwell-E (2016)Skylake (server) (2017−2018)
Release date31 May 2016 (8 years ago)19 October 2018 (6 years ago)
Launch price (MSRP)$345$989

Cost-effectiveness evaluation

Performance per price, higher is better.

i9-9900X has 201% better value for money than i7-6800K.

Detailed specifications

Core i7-6800K and Core i9-9900X basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores6 (Hexa-Core)10 (Deca-Core)
Threads1220
Base clock speed3.4 GHz3.5 GHz
Boost clock speed3.8 GHz4.5 GHz
Bus typeno dataDMI 3.0
Bus rateno data4 × 8 GT/s
Multiplierno data35
L1 cache32 KB (per core)64 KB (per core)
L2 cache256 KB (per core)1 MB (per core)
L3 cache15 MB (shared)19.25 MB (shared)
Chip lithography14 nm14 nm
Maximum core temperatureno data92 °C
Maximum case temperature (TCase)72 °C72 °C
64 bit support++
Windows 11 compatibility-+
Unlocked multiplier++

Compatibility

Information on Core i7-6800K and Core i9-9900X compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration11 (Uniprocessor)
SocketFCLGA2011FCLGA2066
Power consumption (TDP)140 Watt165 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-6800K and Core i9-9900X. You'll probably need this information if you require some particular technology.

Instruction set extensionsno dataIntel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512
AES-NI++
AVX++
Enhanced SpeedStep (EIST)++
Turbo Boost Technology2.02.0
Hyper-Threading Technology++
TSX-+
Idle States+no data
Smart Response+no data
Turbo Boost Max 3.0++

Security technologies

Core i7-6800K and Core i9-9900X technologies aimed at improving security, for example, by protecting against hacks.

TXT+no data
EDB++

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-6800K and Core i9-9900X are enumerated here.

VT-d++
VT-x++
EPT+no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-6800K and Core i9-9900X. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR4DDR4-2666
Maximum memory size128 GB128 GB
Max memory channels44
Maximum memory bandwidthno data85.33 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardno dataN/A

Peripherals

Specifications and connection of peripherals supported by Core i7-6800K and Core i9-9900X.

PCIe version3.03.0
PCI Express lanes2844

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.


Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

i7-6800K 6.76
i9-9900X 13.74
+103%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

i7-6800K 10738
i9-9900X 21821
+103%

GeekBench 5 Single-Core

GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.

i7-6800K 1236
i9-9900X 1451
+17.4%

GeekBench 5 Multi-Core

GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.

i7-6800K 5661
i9-9900X 9300
+64.3%

Gaming performance

Pros & cons summary


Performance score 6.76 13.74
Recency 31 May 2016 19 October 2018
Physical cores 6 10
Threads 12 20
Power consumption (TDP) 140 Watt 165 Watt

i7-6800K has 17.9% lower power consumption.

i9-9900X, on the other hand, has a 103.3% higher aggregate performance score, an age advantage of 2 years, and 66.7% more physical cores and 66.7% more threads.

The Core i9-9900X is our recommended choice as it beats the Core i7-6800K in performance tests.


Should you still have questions on choice between Core i7-6800K and Core i9-9900X, ask them in Comments section, and we shall answer.

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Intel Core i7-6800K
Core i7-6800K
Intel Core i9-9900X
Core i9-9900X

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Community ratings

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Questions & comments

Here you can ask a question about Core i7-6800K or Core i9-9900X, agree or disagree with our judgements, or report an error or mismatch.