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AMD Ryzen 7 5800X vs Intel 9th Gen Intel Core i9-9900K: Comparison
AMD Ryzen 7 5800X vs Intel 9th Gen Intel Core i9-9900K: the l3 cache difference
On l3 cache the spread is 50%, AMD Ryzen 7 5800X 32 MB against Intel 9th Gen Intel Core i9-9900K 16 MB, so AMD Ryzen 7 5800X takes it. Blender Cycles (CPU) backs the spec sheet up. AMD Ryzen 7 5800X scores 207 to 170 over 323 runs, 18% clear. L2 cache runs the same way, 4 MB on the AMD Ryzen 7 5800X versus 2 MB on the Intel 9th Gen Intel Core i9-9900K, another win for AMD Ryzen 7 5800X. Add pcie lanes to that, 20 on the AMD Ryzen 7 5800X versus 16 on the Intel 9th Gen Intel Core i9-9900K, and the pattern holds.
Which should you buy, AMD Ryzen 7 5800X or Intel 9th Gen Intel Core i9-9900K?
Take the AMD Ryzen 7 5800X for desktop gaming and productivity builds wanting genuine Zen 3 architectural gains with strong single-threaded performance. Avoid it for buyers who need integrated graphics, this chip requires a discrete GPU. Take the Intel 9th Gen Intel Core i9-9900K for gaming and productivity desktop builds wanting Intel's strongest mainstream Coffee Lake Refresh performance. It is not the one for buyers wanting the very latest architecture, considerably newer chips offer meaningful IPC and efficiency improvements.
Where the two are identical
The common ground is wider than the gap: total cores, performance cores, efficiency cores, total threads and socket status are identical here. They match on 5 further specifications as well.
Which is cheaper, AMD Ryzen 7 5800X or Intel 9th Gen Intel Core i9-9900K?
Cost splits them too. AMD Ryzen 7 5800X sits at $449, Intel 9th Gen Intel Core i9-9900K at $488, 9% more.
Frequently asked questions
Do the AMD Ryzen 7 5800X and Intel 9th Gen Intel Core i9-9900K differ on p-core boost clock?
Yes. P-Core Boost Clock reads 4.7 GHz on the AMD Ryzen 7 5800X versus 5 GHz on the Intel 9th Gen Intel Core i9-9900K.
Is the Form Factor the same on the AMD Ryzen 7 5800X and Intel 9th Gen Intel Core i9-9900K?
It is. Both are listed at Desktop, so it is not a reason to pick one over the other.
Specs and benchmarks
Brand
- AMD Ryzen 7 5800X
- AMD
- Intel 9th Gen Intel Core i9-9900K
- Intel
Product Line
- AMD Ryzen 7 5800X
- Ryzen 7
- Intel 9th Gen Intel Core i9-9900K
- Core i9
Form Factor
- AMD Ryzen 7 5800X
- Desktop
- Intel 9th Gen Intel Core i9-9900K
- Desktop
Model Number
- AMD Ryzen 7 5800X
- 5800X
- Intel 9th Gen Intel Core i9-9900K
- 9900K
Codename
- AMD Ryzen 7 5800X
- Vermeer
- Intel 9th Gen Intel Core i9-9900K
- Coffee Lake Refresh
Release Year
- AMD Ryzen 7 5800X
- 2020
- Intel 9th Gen Intel Core i9-9900K
- 2018
TDP
- AMD Ryzen 7 5800X
- 105 W
- Intel 9th Gen Intel Core i9-9900K
- 95 W
iGPU
- AMD Ryzen 7 5800X
- None
- Intel 9th Gen Intel Core i9-9900K
- Intel UHD Graphics 630
Market Segment
- AMD Ryzen 7 5800X
- Desktop
- Intel 9th Gen Intel Core i9-9900K
- Desktop
Microarchitecture
- AMD Ryzen 7 5800X
- Zen 3, Ryzen 5000 Series
- Intel 9th Gen Intel Core i9-9900K
- Coffee Lake Refresh, 9th Gen Intel Core
Socket
- AMD Ryzen 7 5800X
- AM4
- Intel 9th Gen Intel Core i9-9900K
- FCLGA1151
Socket Status
- AMD Ryzen 7 5800X
- End of Life
- Intel 9th Gen Intel Core i9-9900K
- End of Life
Process Node
- AMD Ryzen 7 5800X
- 7 nm
- Intel 9th Gen Intel Core i9-9900K
- 14 nm
Total Cores
- AMD Ryzen 7 5800X
- 8
- Intel 9th Gen Intel Core i9-9900K
- 8
Performance Cores
- AMD Ryzen 7 5800X
- 8
- Intel 9th Gen Intel Core i9-9900K
- 8
Efficiency Cores
- AMD Ryzen 7 5800X
- 0
- Intel 9th Gen Intel Core i9-9900K
- 0
Total Threads
- AMD Ryzen 7 5800X
- 16
- Intel 9th Gen Intel Core i9-9900K
- 16
SMT Enabled
- AMD Ryzen 7 5800X
- Yes
- Intel 9th Gen Intel Core i9-9900K
- Yes
P-Core Base Clock
- AMD Ryzen 7 5800X
- 3.8 GHz
- Intel 9th Gen Intel Core i9-9900K
- 3.6 GHz
P-Core Boost Clock
- AMD Ryzen 7 5800X
- 4.7 GHz
- Intel 9th Gen Intel Core i9-9900K
- 5 GHz
L2 Cache
- AMD Ryzen 7 5800X
- 4 MBBest
- Intel 9th Gen Intel Core i9-9900K
- 2 MB-50%
L3 Cache
- AMD Ryzen 7 5800X
- 32 MBBest
- Intel 9th Gen Intel Core i9-9900K
- 16 MB-50%
Base Power
- AMD Ryzen 7 5800X
- 105 W
- Intel 9th Gen Intel Core i9-9900K
- 95 W
Max Turbo Power
- AMD Ryzen 7 5800X
- 142 W
- Intel 9th Gen Intel Core i9-9900K
- 95 W
Memory Type
- AMD Ryzen 7 5800X
- DDR4-3200
- Intel 9th Gen Intel Core i9-9900K
- DDR4-2666
Max Memory Speed
- AMD Ryzen 7 5800X
- 3200 MT/sBest
- Intel 9th Gen Intel Core i9-9900K
- 2666 MT/s
Memory Channels
- AMD Ryzen 7 5800X
- 2
- Intel 9th Gen Intel Core i9-9900K
- 2
ECC Support
- AMD Ryzen 7 5800X
- Yes
- Intel 9th Gen Intel Core i9-9900K
- No
Integrated Graphics
- AMD Ryzen 7 5800X
- No
- Intel 9th Gen Intel Core i9-9900K
- Yes
Copilot Plus Certified
- AMD Ryzen 7 5800X
- No
- Intel 9th Gen Intel Core i9-9900K
- No
PCIe Generation
- AMD Ryzen 7 5800X
- PCIe 4.0
- Intel 9th Gen Intel Core i9-9900K
- 3.0
PCIe Lanes
- AMD Ryzen 7 5800X
- 20
- Intel 9th Gen Intel Core i9-9900K
- 16-20%
Launch MSRP
- AMD Ryzen 7 5800X
- $449
- Intel 9th Gen Intel Core i9-9900K
- $488
Retail Availability
- AMD Ryzen 7 5800X
- Boxed Retail
- Intel 9th Gen Intel Core i9-9900K
- Retail
Benchmarks
- 3D Rendering
Blender Cycles (CPU)
- AMD Ryzen 7 5800X
- 207Best
- Intel 9th Gen Intel Core i9-9900K
- 170-18%
Blender 4.5, Blender Open Data (CC0). Median of monster + junkshop + classroom, combined samples/min.
Renders a 3D scene using every core. Shows speed for 3D and rendering work, not gaming.
- General CPU
SPECrate® 2017 Integer (base), 1-chip
- AMD Ryzen 7 5800X
- 76.3Best
- Intel 9th Gen Intel Core i9-9900K
- 51-33%
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Server-style tasks like compiling and compression on every thread. Best for judging workstation and server work.
SPECrate® 2017 Floating Point (base), 1-chip
- AMD Ryzen 7 5800X
- 61.9Best
- Intel 9th Gen Intel Core i9-9900K
- 42.9-31%
Best published 1-chip result on spec.org, retrieved 23 Sept 2026.
Scientific and engineering tasks on every thread. Rewards core count and memory bandwidth.
SPEC®, SPECrate® and SPECspeed® are registered trademarks of the Standard Performance Evaluation Corporation. Copied by permission of the Standard Performance Evaluation Corporation (SPEC). Results retrieved from www.spec.org on 23 Sept 2026.
Which one should you pick?
Choose 5800X if you want the higher L2 cache (4 MB vs 2 MB), the higher L3 cache (32 MB vs 16 MB) and the higher memory channels (2 vs 2).
Choose 9900K if you already have it on hand or find it at a lower price.
Price comparison
| Retailer | AMD Ryzen 7 5800X | Intel 9th Gen Intel Core i9-9900K |
|---|---|---|
| Amazon | $449.00 View on Amazon | |
| Newegg | View on Newegg | |
| Consumercarts listing | $488.00 View on Consumercarts listing |
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.