Phenom II X4 840T vs i7-8700K

Aggregate performance score

Core i7-8700K
2017
6 cores / 12 threads, 95 Watt
8.90
+486%

Core i7-8700K outperforms Phenom II X4 840T by a whopping 486% based on our aggregate benchmark results.

Primary details

Comparing Core i7-8700K and Phenom II X4 840T processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking8742156
Place by popularitynot in top-100not in top-100
Cost-effectiveness evaluation4.582.28
Market segmentDesktop processorDesktop processor
SeriesIntel Core i7no data
Power efficiency8.541.46
Architecture codenameCoffee Lake-S (2017−2018)Zosma (2010−2011)
Release date5 October 2017 (7 years ago)1 September 2010 (14 years ago)
Launch price (MSRP)$359$80

Cost-effectiveness evaluation

Performance per price, higher is better.

i7-8700K has 101% better value for money than Phenom II X4 840T.

Detailed specifications

Core i7-8700K and Phenom II X4 840T 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)4 (Quad-Core)
Threads124
Base clock speed3.7 GHz2.9 GHz
Boost clock speed4.7 GHz3.2 GHz
Bus typeDMI 3.0no data
Bus rate4 × 8 GT/sno data
Multiplier37no data
L1 cache64K (per core)128 KB (per core)
L2 cache256K (per core)512 KB (per core)
L3 cache12288 KB6 MB (shared)
Chip lithography14 nm45 nm
Die size149 mm2346 mm2
Maximum core temperature100 °Cno data
Maximum case temperature (TCase)72 °Cno data
Number of transistorsno data904 million
64 bit support++
Windows 11 compatibility+-
Unlocked multiplier+-

Compatibility

Information on Core i7-8700K and Phenom II X4 840T 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 configuration1 (Uniprocessor)1
SocketFCLGA1151AM3
Power consumption (TDP)95 Watt95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-8700K and Phenom II X4 840T. You'll probably need this information if you require some particular technology.

Instruction set extensionsIntel® SSE4.1, Intel® SSE4.2, Intel® AVX2no data
AES-NI+-
AVX+-
vPro+no data
Enhanced SpeedStep (EIST)+no data
Turbo Boost Technology2.0no data
Hyper-Threading Technology+no data
TSX+-
Idle States+no data
Thermal Monitoring+-
SIPP+-

Security technologies

Core i7-8700K and Phenom II X4 840T technologies aimed at improving security, for example, by protecting against hacks.

TXT+no data
EDB+no data
Secure Key+no data
MPX+-
Identity Protection+-
SGXYes with Intel® MEno data
OS Guard+no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-8700K and Phenom II X4 840T are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-8700K and Phenom II X4 840T. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory typesDDR3, DDR4DDR3
Maximum memory size128 GBno data
Max memory channels2no data
Maximum memory bandwidth42.671 GB/sno data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics cardIntel UHD Graphics 630no data
Max video memory64 GBno data
Quick Sync Video+-
Clear Video+no data
Clear Video HD+no data
Graphics max frequency1.2 GHzno data
InTru 3D+no data

Graphics interfaces

Available interfaces and connections of Core i7-8700K and Phenom II X4 840T integrated GPUs.

Number of displays supported3no data

Graphics image quality

Maximum display resolutions supported by Core i7-8700K and Phenom II X4 840T integrated GPUs, including resolutions over different interfaces.

4K resolution support+no data
Max resolution over HDMI 1.44096 x 2304@24Hzno data
Max resolution over eDP4096 x 2304@60Hzno data
Max resolution over DisplayPort4096 x 2304@60Hzno data

Graphics API support

APIs supported by Core i7-8700K and Phenom II X4 840T integrated GPUs, sometimes API versions are included.

DirectX12no data
OpenGL4.5no data

Peripherals

Specifications and connection of peripherals supported by Core i7-8700K and Phenom II X4 840T.

PCIe version3.02.0
PCI Express lanes16no data

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.

i7-8700K 8.90
+486%
Phenom II X4 840T 1.52

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.

i7-8700K 13622
+485%
Phenom II X4 840T 2330

Gaming performance

Pros & cons summary


Performance score 8.90 1.52
Recency 5 October 2017 1 September 2010
Physical cores 6 4
Threads 12 4
Chip lithography 14 nm 45 nm

i7-8700K has a 485.5% higher aggregate performance score, an age advantage of 7 years, 50% more physical cores and 200% more threads, and a 221.4% more advanced lithography process.

The Core i7-8700K is our recommended choice as it beats the Phenom II X4 840T in performance tests.


Should you still have questions on choice between Core i7-8700K and Phenom II X4 840T, ask them in Comments section, and we shall answer.

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Intel Core i7-8700K
Core i7-8700K
AMD Phenom II X4 840T
Phenom II X4 840T

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Community ratings

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Questions & comments

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