AMD Ryzen 9 9900X3D socket: AM5
The AMD Ryzen 9 9900X3D uses the AM5 socket. It is the 12-core Zen 5 part with stacked 3D V-Cache, running on 800 series boards out of the box and on 600 series boards after a BIOS update.
- Socket
- AM5
- Launched
- March 12, 2025
- Cores and threads
- 12 and 24
- Default TDP
- 120 W
- Codename
- Granite Ridge
- Segment
- Desktop
- Family
- AMD Ryzen 9
- Clocks
- 4.4 / 5.5 GHz
AMD Ryzen 9 9900X3D specifications
| Cores | 12 |
|---|---|
| Threads | 24 |
| Core architecture | Zen 5 with second-generation 3D V-Cache on one CCD |
| Clocks | 4.4 GHz base, up to 5.5 GHz boost |
| Cache | 128 MB L3 (including 64 MB stacked) and 12 MB L2 |
| Default TDP | 120 W |
| Manufacturing process | TSMC 4 nm CCDs, 6 nm I/O die |
| Memory support | DDR5 up to 5600 MT/s, two channels, up to 256 GB |
| PCI Express | PCIe 5.0, 28 lanes (24 usable) |
| Integrated graphics | AMD Radeon Graphics, 2 compute units (up to 2200 MHz) |
| Multiplier | Unlocked |
| Package | AM5 (LGA1718) |
| Cooler in the box | None |
| Launch price | $599 (AMD launch MSRP) |
Motherboard and chipset compatibility
AMD Ryzen 9 9900X3D needs a motherboard with a AM5 socket. The table shows which chipset series accept it.
| Series | Chipsets | Support |
|---|---|---|
| 800 series | X870E, X870, B850, B840 | Works out of the box |
| 600 series | X670E, X670, B650E, B650, A620 | Needs a BIOS update Needs a BIOS update on boards built before the Ryzen 9000 launch. Check the board maker's CPU support list. |
Board makers publish a CPU support list for every model. Check it for your exact board before buying. Chipset details for AM5.
Recommended GPU pairing
| Recommended tier | High-end 4K |
|---|---|
| Example GPUs | GeForce RTX 5080, Radeon RX 7900 XTX |
| Target resolution | 4K high settings |
Twelve Zen 5 cores with stacked cache, PCIe 5.0 lanes and DDR5-5600 suit high-end 4K cards from 2025. The RTX 5080 from January 2025 and the RX 7900 XTX from December 2022 match that class at 4K high settings.
This is a rough match for a new build at the stated resolution, not a limit. A faster card still works and helps at higher resolutions or in games that load the GPU more than the CPU. A slower card is fine for lighter games and office use. The exact balance shifts with the game, the settings and the resolution, so no percentage is given.
AM5 at a glance
| Type | LGA, 1,718 contacts |
|---|---|
| Package size | 40 × 40 mm |
| Introduced | September 2022 |
| Memory | DDR5 only (AMD EXPO profiles for faster kits) |
| Cooler mounting holes | 54 × 90 mm |
What the Ryzen 9 9900X3D is
The Ryzen 9 9900X3D is a twelve core, twenty-four thread processor that AMD released in March 2025 beside the 9950X3D. It belongs to the Ryzen 9000 series, codenamed Granite Ridge, and carries the same second-generation stacked cache: a 64 MB die under one CCD for 128 MB of total L3 with 12 MB of L2. The base clock is 4.4 GHz with boost to 5.5 GHz, and AMD rates the default TDP at 120 W.
With four fewer cores than the flagship, the 9900X3D draws less power and costs $100 less at a $599 launch price, while keeping the full 128 MB cache that games respond to. The compute dies use TSMC 4 nm with a 6 nm I/O die. Basic Radeon graphics with two compute units handle display output, and no cooler ships in the box.
The multiplier is unlocked, matching the rest of the Zen 5 stacked range and differing from the locked first generation parts.
Socket and motherboard compatibility
The 9900X3D fits the AM5 socket with 1,718 contacts. Chipset 800 series boards (X870E, X870, B850, B840) accept it without updates, since they launched for Ryzen 9000. Boards with 600 series chipsets (X670E, X670, B650E, B650, A620) need a BIOS update first on units built before Ryzen 9000 support.
The 120 W rating suits a wide spread of boards, though sustained all-core loads still want solid power delivery. EXPO memory profiles work across the chipset range.
Shoppers comparing with the 16-core flagship should weigh thread needs: gaming performance tracks the cache both chips share, while rendering and compiling favor the bigger die count of the AMD Ryzen 9 9950X3D.
Memory, PCIe and cooling
DDR5 up to 5600 MT/s with two modules, slower with four, across two channels to 256 GB. EXPO profiles set faster kits to rated speed. No DDR4 path exists.
PCIe 5.0 lanes total 28 with 24 usable for graphics and NVMe devices on boards wired for Gen5. The remaining lanes serve the chipset link and board devices.
A 120 W TDP is comfortable for a good tower air cooler, with liquid cooling optional for quiet sustained loads. AMD bundles no cooler. The 54 × 90 mm mounting pattern matches AM4 hardware with the right kit, detailed in the CPU cooler compatibility by socket guide.
What the stacked cache changes
The stacked 64 MB die sits under one CCD rather than on top as before, which is why clocks hold at 5.5 GHz boost instead of dropping. Total L3 of 128 MB matches the flagship, so cache-bound games see the same large pool with fewer threads behind it.
Only one CCD carries the extra die, a layout shared with the 9950X3D. Mixed gaming and creation workloads get a cache complex plus a standard complex in one package, with no manual setup beyond current drivers and BIOS.
Against the non-stacked 9900X the X3D costs more for gaming returns while giving up a little boost clock, which suits gaming-first builds over clock-chasing ones.
Upgrade paths
Within AM5 the 9900X3D sits between the 8-core 9800X3D for pure gaming value and the 16-core flagship for mixed work. All three share boards and DDR5, subject to BIOS.
Arrivals from AM4 need a new board, DDR5 memory and cooler hardware. AM5 support stated through 2029 keeps the platform viable for later swaps.
Frequently asked questions
What socket does the AMD Ryzen 9 9900X3D use?
It uses AM5, an LGA socket with 1,718 contacts.
Does the 9900X3D work on an X670 motherboard?
Yes, after a BIOS update that adds Ryzen 9000 support. 800 series boards accept it out of the box.
Does the 9900X3D support DDR4?
No. AM5 is a DDR5 only platform.
Do both CCDs of the 9900X3D have stacked cache?
Only one of the two CCDs carries the 64 MB stacked die. Total L3 is 128 MB.
Does the 9900X3D come with a cooler?
No. AMD includes no cooler with the 9900X3D.
Sources and verification
Facts last checked against these sources on . Page last edited on .