CPUs compared

AMD Ryzen 9 9900X3D vs Intel Core Ultra 9 285K

  • The Intel Core Ultra 9 285K launched $10 lower ($589 vs $599).
  • Different sockets (AM5 and LGA1851): they need different motherboards.
  • The Intel Core Ultra 9 285K has 12 more cores (24 vs 12).
AMD

AMD Ryzen 9 9900X3D

12 cores · 5.5 GHz · AM5 · DDR5-5600

Launched at $599

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Intel

Intel Core Ultra 9 285K

24 cores · 5.7 GHz · LGA1851 · DDR5-5600

Launched at $589

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Specs side by side

7 of 10 differ, marked. Speed isn't compared here: we only list specs we can source.

SpecAMD Ryzen 9 9900X3DIntel Core Ultra 9 285K
Cores12 cores, 24 threads24 cores, 24 threads
Boost clockUp to 5.5 GHzUp to 5.7 GHz
L3 cache128 MB36 MB
Power (TDP)120 W125 W
Built-in graphicsYesYes
SocketAM5LGA1851
PCIePCIe 5.0PCIe 5.0
Official DDR5 speedDDR5-5600 (DDR5-3600 with 4 modules)DDR5-5600 (DDR5-4400 with 4 modules)
SegmentDesktopDesktop
LaunchedMarch 12, 2025Oct 24, 2024

Which motherboards take them

AMD Ryzen 9 9900X3D

AM5 boards with these chipsets:

  • X870E
  • X870
  • B850
  • B840
  • X670E
  • X670
  • A620
  • A620A
  • B650E
  • B650

Intel Core Ultra 9 285K

LGA1851 boards with these chipsets:

  • H810
  • B860
  • Q870
  • W880
  • Z890

Sources

AMD Ryzen 9 9900X3D

  1. Wikipedia: List of AMD Ryzen processors · CC BY-SA 4.0

Intel Core Ultra 9 285K

  1. Wikipedia: Arrow Lake (microprocessor) · CC BY-SA 4.0

Specs last checked Oct 19, 2026. Spotted a mistake? Tell us and we'll fix it.