AM5 · Zen 5 3D V-Cache · 8 Cores · 120W TDP
The AMD Ryzen 7 9800X3D is the Zen 5 gaming chip: 8 cores and 16 threads, with 96MB of L3 cache supplied by second-generation 3D V-Cache. AMD publishes a default TDP of 120W, and unlike the X3D parts before it this one is unlocked for overclocking — Precision Boost Overdrive, Curve Optimizer and EXPO memory tuning are all available.
That sets a low bar for the motherboard. 120W is an easy load for any current AM5 board, so raw VRM capacity matters far less here than it does on a 16-core part like the Ryzen 9 9950X. What actually matters is a BIOS that supports Ryzen 9000, DDR5 with EXPO, enough M.2 slots for the drives you own, and the rear I/O you need. Every pick below is drawn from a board we have written a full review of, and is based on published specifications rather than hands-on testing.
Building an AMD system? Two vulnerabilities in the TPM 2.0 reference code behind AMD's firmware TPM were published on 11 August 2026 (AMD-SB-7064, CVE-2026-6726 and CVE-2026-6727). Both need local privileged access, so neither is remotely exploitable, and this is not a recall. The fix ships as a motherboard BIOS update rather than through Windows Update, and coverage varies by board. Our fTPM caveat explainer covers what to check before you enable fTPM.
14+2+1 phases · WiFi 6E · 2.5G LAN · 3x M.2
The default answer for this CPU. A 14+2+1 power stage arrangement is well beyond what a 120W part draws, and the board gives you three M.2 slots, four SATA ports and eight rear USB ports — enough that most builders never need an add-in card. The graphics slot is PCIe 4.0 x16, which is not a limitation for any current GPU. Spend the difference on the graphics card instead.
12+2+1 phases · WiFi 6E · 2.5G LAN · 2x M.2
The cheapest sensible landing spot for a 9800X3D. Twelve core power stages still leave headroom over a 120W CPU, and you keep four DDR5 slots, WiFi 6E and 2.5G networking. The trade is storage: two M.2 slots rather than three, and a plainer ALC897 audio codec. If you run one boot drive and one game drive, you lose nothing that matters.
12+2 phases · WiFi 6E · 2.5G LAN · 3x M.2
The middle option if you prefer the ASUS BIOS. It matches the Tomahawk on storage with three M.2 slots and on rear connectivity with eight USB ports, and runs a 12+2 power stage design that is still generous for this CPU. EXPO is a single toggle in the ASUS firmware, which is the one setting most 9800X3D owners actually need to change.
18+2 phases · WiFi 7 · 2.5G LAN · 4x M.2
Buy this for the connectivity, not for the CPU. The 18+2 power stages are far more than a 120W chip will ever ask for, but four M.2 slots, twelve rear USB ports, WiFi 7 and dual PCIe 5.0 x16 slots are a real upgrade if you run a lot of drives and peripherals. It will not make the 9800X3D faster than a cheaper board would.
Mini-ITX · 12+2 phases · PCIe 5.0 x16 · 2x M.2
The small-form-factor pick. A 12+2 power stage design in a Mini-ITX footprint is unusually strong, and the PCIe 5.0 x16 graphics slot plus ALC4080 audio are features you normally give up in this size. The compromises are inherent to the format: two DDR5 slots instead of four, and two M.2 slots. A 120W CPU is a much easier thermal proposition in a small case than a 16-core part would be.
The 9800X3D is an unusually undemanding CPU to shop a board for. These are the things that actually change your experience, and the things that do not.
Chipset choice on AM5 is about connectivity, not CPU performance. Board prices move week to week, so this table compares what each tier gives you rather than what it costs.
| Tier | Chipset | What It Adds | Best For |
|---|---|---|---|
| Entry | B650 | PCIe 4.0 graphics slot, two or three M.2 slots | Pure gaming builds |
| Sweet Spot | B650E | PCIe 5.0 graphics slot at B650 connectivity | Builders who want a PCIe 5.0 GPU link |
| High-End | X870E | WiFi 7, four M.2 slots, the most rear USB | Heavy storage and peripheral loads |
Hardware Unboxed's review of the Ryzen 7 9800X3D covers the CPU's behaviour in detail, which is useful context for deciding how much board you need: