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AM5 vs LGA1851: AMD or Intel for a new PC in 2026?

Updated · PC Parts Australia

Short answer: for a gaming-first PC, AMD’s AM5 platform with a Ryzen X3D processor is the stronger choice today and has the clearer upgrade path. Intel’s LGA1851 platform is worth a look if heavy multithreaded work matters more than peak frame rates, or if you want Thunderbolt built in.

What each platform is

AM5 is AMD’s desktop socket for Ryzen 7000 and Ryzen 9000 processors. LGA1851 is Intel’s socket for Core Ultra desktop processors, including the newer Core Ultra 200S Plus models. Both platforms use DDR5 memory only.

Gaming

AMD’s X3D chips carry extra cache stacked on the processor, and games respond well to it. In Tom’s Hardware testing across 16 games at 1080p, the Ryzen 7 9800X3D averaged about 35% more frames per second than Intel’s Core Ultra 9 285K. The 16-core Ryzen 9 9950X3D finished within half a percent of the 9800X3D in the same suite.

That gap is largest at 1080p with a fast graphics card, where the processor is the limit. At 1440p and 4K the graphics card does more of the work, so the difference shrinks. With a mid-range card at high resolution, either platform will feel similar.

Productivity

Intel’s Core Ultra 9 285K is strong in heavily threaded work. In Tom’s Hardware’s Cinebench 2024 multi-core test it scored 2,496 against 1,376 for the eight-core 9800X3D. For a fair comparison on AMD’s side, look at the 16-core Ryzen 9 chips, which are built for the same kind of work. Results depend heavily on the software you use, so check reviews that test your own applications.

Upgrade path

AMD’s public promise covers AM5 until at least 2027, and later reports say the socket will be supported into 2029. A board bought today should accept future Ryzen chips with a BIOS update, which is a real saving when you upgrade.

On LGA1851, Intel has released the Core Ultra 200S Plus refresh for the same socket. Intel has not confirmed that its next desktop generation will use LGA1851, and reports point to a new socket. Plan on the processor you buy now, or a 200S Plus model, being the last upgrade for that board.

Features

AM5 LGA1851
Memory DDR5 DDR5, including CUDIMM kits on compatible boards
Fast USB USB4 required on X870 and X870E boards Thunderbolt 4 built into the platform (depends on the board)
AI accelerator None on desktop Ryzen 9000 NPU of about 13 TOPS
Integrated graphics Basic Radeon graphics on most models Intel graphics on models without an F suffix
Cooler mounting Most AM4 coolers fit Most LGA1700 coolers fit

Chipsets side by side

Tier AMD AM5 Intel LGA1851
Entry A620, B840: no CPU overclocking H810: no CPU overclocking
Mainstream B650, B850: overclocking, PCIe 5.0 storage on B850 B860: memory overclocking, no CPU overclocking
High end X670E, X870, X870E: PCIe 5.0 graphics and storage, USB4 on X870/X870E Z890: full CPU and memory overclocking

Browse 800-series AM5 motherboards, 600-series AM5 motherboards and LGA1851 motherboards.

Memory tips for each platform

On AM5, a 32GB kit at 6000MHz with CL30 timings is the common target, and EXPO profiles set it up in one click. Core Ultra processors officially support faster DDR5 and can use CUDIMM kits on compatible Z890 and B860 boards. On either platform, two sticks reach higher speeds than four. See the full DDR5 range.

Which should you choose?

  • Mainly gaming: AM5 with a Ryzen 7 X3D processor and a B850 board.
  • Gaming and heavy creative work: AM5 with a Ryzen 9 X3D chip, or LGA1851 with a Core Ultra 9 if your software favours it.
  • Thunderbolt devices or Intel-specific software: LGA1851 with a Z890 or B860 board that exposes Thunderbolt.
  • Tight budget with an upgrade later: AM5 with a Ryzen 7000 chip now and a newer Ryzen on the same board later.

Next, check the rest of your parts with the first PC build checklist.

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