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Intel Core i7-8700K vs AMD RX-421BD

Last updated: 2024-04-12

CPU comparison with benchmarks


Intel Core i7-8700K		AMD RX-421BD
CPU comparison Intel Core i7-8700K or AMD RX-421BD - which processor is faster? In this comparison we look at the differences and analyze which of these two CPUs is better. We compare the technical data and benchmark results. The Intel Core i7-8700K has 6 cores with 12 threads and clocks with a maximum frequency of 4.70 GHz. Up to 128 GB of memory is supported in 2 memory channels. The Intel Core i7-8700K was released in Q4/2017. The AMD RX-421BD has 4 cores with 4 threads and clocks with a maximum frequency of 3.40 GHz. The CPU supports up to GB of memory in 2 memory channels. The AMD RX-421BD was released in Q4/2015.

Intel Core i7 (299)	Family	AMD R (6)
Intel Core i 8000 (20)	CPU group	AMD RX 1st Gen. (6)
8	Generation	1
Coffee Lake S	Architecture	Merlin Falcon (Excavator)
Desktop	Segment	Notebook
Intel Core i7-7700K	Predecessor	--
Intel Core i7-9700K	Successor	--

CPU Cores and Base Frequency The Intel Core i7-8700K has 6 CPU cores and can calculate 12 threads in parallel. The clock frequency of the Intel Core i7-8700K is 3.70 GHz (4.70 GHz) while the AMD RX-421BD has 4 CPU cores and 4 threads can calculate simultaneously. The clock frequency of the AMD RX-421BD is at 2.10 GHz (3.40 GHz).
Intel Core i7-8700K	Characteristic	AMD RX-421BD
6	Cores	4
12	Threads	4
normal	Core architecture	normal
Yes	Hyperthreading	No
Yes	Overclocking ?	No
3.70 GHz	Frequency	2.10 GHz
4.70 GHz	Turbo Frequency (1 Core)	3.40 GHz
4.30 GHz	Turbo Frequency (All Cores)	--


NPU AI performance The performance values of the processor's AI unit. The isolated NPU performance is specified here, the total AI performance (NPU+CPU+iGPU) can be higher. Processors with support for artificial intelligence (AI) and machine learning (ML) can process many calculations, especially audio, image and video processing, much faster than classic processors.
Intel Core i7-8700K	Characteristic	AMD RX-421BD
--	AI hardware	--
--	AI specifications	--
--	NPU + CPU + iGPU	--

Integrated graphics (iGPU) The Intel Core i7-8700K or AMD RX-421BD has integrated graphics, called iGPU for short. The iGPU uses the system's main memory as graphics memory and sits on the processor's die.
Intel UHD Graphics 630	GPU	AMD Radeon R7 - 512 (Merlin Falcon)
0.35 GHz	GPU frequency	0.80 GHz
1.20 GHz	GPU (Turbo)	--
9.5	GPU Generation	3
14 nm	Technology	28
3	Max. displays	3
24	Compute units	8
192	Shader	512
No	Hardware Raytracing	No
No	Frame Generation	No
64 GB	Max. GPU Memory	2 GB
12	DirectX Version	12

Hardware codec support A photo or video codec that is accelerated in hardware can greatly accelerate the working speed of a processor and extend the battery life of notebooks or smartphones when playing videos.
Intel UHD Graphics 630	GPU	AMD Radeon R7 - 512 (Merlin Falcon)
Decode / Encode	Codec h265 / HEVC (8 bit)	Decode
Decode / Encode	Codec h265 / HEVC (10 bit)	No
Decode / Encode	Codec h264	Decode / Encode
Decode / Encode	Codec VP9	No
Decode / Encode	Codec VP8	No
No	Codec AV1	No
Decode / Encode	Codec AVC	No
Decode	Codec VC-1	No
Decode / Encode	Codec JPEG	Decode

Memory & PCIe The Intel Core i7-8700K can use up to 128 GB of memory in 2 memory channels. The maximum memory bandwidth is 42.7 GB/s. The AMD RX-421BD supports up to GB of memory in 2 memory channels and achieves a memory bandwidth of up to 38.4 GB/s.
Intel Core i7-8700K	Characteristic	AMD RX-421BD
DDR4-2666	Memory	DDR4-2400, DDR3-2133
128 GB	Max. Memory
2 (Dual Channel)	Memory channels	2 (Dual Channel)
42.7 GB/s	Max. Bandwidth	38.4 GB/s
No	ECC	Yes
--	L2 Cache	2.00 MB
12.00 MB	L3 Cache	--
3.0	PCIe version	3.0
16	PCIe lanes	12
15.8 GB/s	PCIe Bandwidth	11.8 GB/s
Thermal Management The thermal design power (TDP for short) of the Intel Core i7-8700K is 95 W, while the AMD RX-421BD has a TDP of 35 W. The TDP specifies the necessary cooling solution that is required to cool the processor sufficiently.
Intel Core i7-8700K	Characteristic	AMD RX-421BD
95 W	TDP (PL1 / PBP)	35 W
--	TDP (PL2)	--
--	TDP up	--
--	TDP down	12 W
--	Tjunction max.	90 °C
Technical details The Intel Core i7-8700K is manufactured in 14 nm and has 12.00 MB cache. The AMD RX-421BD is manufactured in 28 nm and has a 2.00 MB cache.

Intel Core i7-8700K	Characteristic	AMD RX-421BD
14 nm	Technology	28 nm
Monolithic	Chip design	Unknown
x86-64 (64 bit)	Instruction set (ISA)	x86-64 (64 bit)
SSE4.1, SSE4.2, AVX2	ISA extensions	SSE4a, SSE4.1, SSE4.2, AVX, FMA3, FMA4
LGA 1151-2	Socket	FP4
VT-x, VT-x EPT, VT-d	Virtualization	AMD-V, AMD-Vt
Yes	AES-NI	Yes
Windows 10, Windows 11, Linux	Operating systems
Q4/2017	Release date	Q4/2015
370 $	Release price	--

show more data		show more data

Intel Core i7-8700K 6C 12T @ 3.70 GHz (4.70 GHz) buy now on Amazon and save! AMD RX-421BD 4C 4T @ 2.10 GHz (3.40 GHz) buy now on Amazon and save!

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iGPU - FP32 Performance (Single-precision GFLOPS)

The theoretical computing performance of the internal graphics unit of the processor with simple accuracy (32 bit) in GFLOPS. GFLOPS indicates how many billion floating point operations the iGPU can perform per second.


	Intel Core i7-8700K Intel UHD Graphics 630 @ 1.20 GHz	461 (56%)
	AMD RX-421BD AMD Radeon R7 - 512 (Merlin Falcon) @ 0.80 GHz	820 (100%)

Cinebench 2024 (Single-Core)

The Cinebench 2024 benchmark is based on the Redshift rendering engine, which is also used in Maxon's 3D program Cinema 4D. The benchmark runs are each 10 minutes long to test whether the processor is limited by its heat generation.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	72 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Cinebench 2024 (Multi-Core)

The Multi-Core test of the Cinebench 2024 benchmark uses all cpu cores to render using the Redshift rendering engine, which is also used in Maxons Cinema 4D. The benchmark run is 10 minutes long to test whether the processor is limited by its heat generation.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	467 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Cinebench R23 (Single-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	1209 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Cinebench R23 (Multi-Core)

Cinebench R23 is the successor of Cinebench R20 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	8960 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Geekbench 6 (Single-Core)

Geekbench 6 is a partial load benchmark for modern computers, notebooks and smartphones. In the single-core test, only the fastest CPU core is measured. The test run simulates the performance in practice.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	1486 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Geekbench 6 (Multi-Core)

The practical Geekbench 6 multi-core benchmark tests the system's performance under partial load. The processor's maximum power consumption is far from being used up.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	6750 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Geekbench 5, 64bit (Single-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	1242 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Geekbench 5, 64bit (Multi-Core)

Geekbench 5 is a cross plattform benchmark that heavily uses the systems memory. A fast memory will push the result a lot. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	6693 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Cinebench R20 (Single-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	487 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Cinebench R20 (Multi-Core)

Cinebench R20 is the successor of Cinebench R15 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	3689 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Blender 3.1 Benchmark

In the Blender Benchmark 3.1, the scenes "monster", "junkshop" and "classroom" are rendered and the time required by the system is measured. In our benchmark we test the CPU and not the graphics card. Blender 3.1 was presented as a standalone version in March 2022.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	126 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Estimated results for PassMark CPU Mark

Some of the CPUs listed below have been benchmarked by CPU-monkey. However the majority of CPUs have not been tested and the results have been estimated by a CPU-monkey’s secret proprietary formula. As such they do not accurately reflect the actual Passmark CPU mark values and are not endorsed by PassMark Software Pty Ltd.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	13770 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Blender 2.81 (bmw27)

Blender is a free 3D graphics software for rendering (creating) 3D bodies, which can also be textured and animated in the software. The Blender benchmark creates predefined scenes and measures the time (s) required for the entire scene. The shorter the time required, the better. We selected bmw27 as the benchmark scene.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	232.4 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

CPU-Z Benchmark 17 (Single-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	510 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

CPU-Z Benchmark 17 (Multi-Core)

The CPU-Z benchmark measures a processor's performance by measuring the time it takes the system to complete all benchmark calculations. The faster the benchmark is completed, the higher the score.


	Intel Core i7-8700K 6C 12T @ 3.70 GHz	3709 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Cinebench R15 (Single-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The single-core test only uses one CPU core, the amount of cores or hyperthreading ability doesn't count.


	Intel Core i7-8700K 6C 12T @ 4.70 GHz	208 (100%)
	AMD RX-421BD 4C 4T @ 3.40 GHz	0 (0%)

Cinebench R15 (Multi-Core)

Cinebench R15 is the successor of Cinebench 11.5 and is also based on the Cinema 4 Suite. Cinema 4 is a worldwide used software to create 3D forms. The multi-core test involves all CPU cores and taks a big advantage of hyperthreading.


	Intel Core i7-8700K 6C 12T @ 4.30 GHz	1447 (100%)
	AMD RX-421BD 4C 4T @ 2.10 GHz	0 (0%)

Devices using this processor
Intel Core i7-8700K	AMD RX-421BD
PC mit Intel Core i7-8700K	Unknown

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