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Intel Core i9-9900KF vs AMD RX-421BD

Last updated: 2026-07-03

Table of Contents

Summary
Benchmarks
Specifications
User Reviews
Popular Comparisons

Summary

Benchmarks

Performance Overview
Average performance across multiple benchmarks

Single-core performance

Rank ?

Intel Core i9-9900KF

Rank ?

AMD RX-421BD

Multi-core performance

Rank ?

Intel Core i9-9900KF

Rank ?

AMD RX-421BD

More benchmarks

Cinebench 2026 (ST)
218 entries

Cinebench 2026 (MC)
219 entries

Cinebench 2024 (SC)
427 entries

Cinebench 2024 (MC)
422 entries

Cinebench R23 (SC)
690 entries

Cinebench R23 (MC)
665 entries

Geekbench 6 (SC)
1,989 entries

Geekbench 6 (MC)
1,927 entries

Cinebench R20 (SC)
666 entries

Geekbench 5 (SC)
2,512 entries

Cinebench R20 (MC)
615 entries

Geekbench 5 (MC)
2,483 entries

FP32 SP (iGPU)
2,219 entries

Blender 3.1 Benchmark
213 entries

PassMark CPU-Mark
2,504 entries

Blender 2.81 (bmw27)
190 entries

CPU-Z Benchmark 17 (SC)
250 entries

CPU-Z Benchmark 17 (MC)
751 entries

Monero Hashrate
94 entries

V-Ray CPU-Render
251 entries

Cinebench R15 (SC)
1,113 entries

Cinebench R15 (MC)
1,110 entries

Geekbench 3 (SC)
945 entries

Geekbench 3 (MC)
941 entries

Cinebench R11.5 (SC)
826 entries

Cinebench R11.5 (MC)
837 entries

Specifications

At a glance

Wischen	Intel Core i9-9900KF	AMD RX-421BD
Family	Intel Core i9 (81)	AMD R (6)
CPU group	Intel Core i 9000 (34)	AMD RX 1st Gen. (6)
Architecture	Coffee Lake S Refresh	Merlin Falcon (Excavator)
Technology	14 nm	28 nm
Segment	Desktop	Notebook
Socket	LGA 1151-2	FP4
Predecessor
Successor	Intel Core i9-10900KF

CPU Cores and Base Frequency

Wischen	Intel Core i9-9900KF	AMD RX-421BD
CPU Cores / Threads	8 / 16	4 / 4
Hyperthreading / SMT	✓	✗
Core architecture	normal	normal
Cores:	8x	4x
Frequency:	3.60 GHz	2.10 GHz
Turbo (1 Core):	5.00 GHz	3.40 GHz
Turbo (All Cores):	4.70 GHz
L2-Cache		2.00 MB
L3-Cache	16.00 MB
Overclocking	✓	✗

Integrated graphics (iGPU)

Wischen	Intel Core i9-9900KF	AMD RX-421BD
GPU name	no iGPU	AMD Radeon R7 - 512 (Merlin Falcon)
GPU frequency		0.80 GHz
CUs / Shader	/	8 / 512
Raytracing	✗	✗
Max. displays		3
Max. GPU Memory		2 GB
Technology		28
Release date		2015

NPU AI performance

Wischen	Intel Core i9-9900KF	AMD RX-421BD
AI hardware
AI specifications
NPU + CPU + iGPU

Memory & PCIe

Wischen	Intel Core i9-9900KF	AMD RX-421BD
Memory	DDR4-2666 (42.7 GB/s)	DDR4-2400 (38.4 GB/s) DDR3-2133 (34.2 GB/s)
Max. Memory	128 GB
Memory channels	2	2
ECC	No	Yes
PCIe	3.0 x 16	3.0 x 12
PCIe Bandwidth	15.8 GB/s	11.8 GB/s

Thermal Management

Wischen	Intel Core i9-9900KF	AMD RX-421BD
TDP	95 W	35 W
TDP (PL2)	119 W @ 28 s
TDP up
TDP down		12 W
T. junction max.	100 °C	90 °C

Technical details

Wischen	Intel Core i9-9900KF	AMD RX-421BD
Chip design	Monolithic	Unknown
AES-NI	✓	✓
Operating systems	Windows 10, Windows 11, Linux
Instruction set	x86-64 (64 bit)	x86-64 (64 bit)
ISA extensions	SSE4.1, SSE4.2, AVX2	SSE4a, SSE4.1, SSE4.2, AVX, FMA3, FMA4
Release date	Q1/2019	Q4/2015
Release price	600 $
Documents	Technical data sheet

User Reviews

Your rating

Here you can rate one or both of the processors. The average rating of Intel Core i9-9900KF is 4.4 stars (20 ratings), while AMD RX-421BD has received 0 stars (0 ratings).

Click on the stars to rate one or both processors.

Intel Core i9-9900KF
8C / 16T · 3.60 - 5.00 GHz

★★★★★

AMD RX-421BD
4C / 4T · 2.10 - 3.40 GHz

★★★★★