AMD Ryzen 9 7900X3D socket: AM5
The AMD Ryzen 9 7900X3D uses the AM5 socket. It is the 12-core Zen 4 part with stacked 3D V-Cache, running natively on both 600 and 800 series AM5 boards.
- Socket
- AM5
- Launched
- February 28, 2023
- Cores and threads
- 12 and 24
- Default TDP
- 120 W
- Codename
- Raphael
- Segment
- Desktop
- Family
- AMD Ryzen 9
- Clocks
- 4.4 / 5.6 GHz
AMD Ryzen 9 7900X3D specifications
| Cores | 12 |
|---|---|
| Threads | 24 |
| Core architecture | Zen 4 with 3D V-Cache on one CCD |
| Clocks | 4.4 GHz base, up to 5.6 GHz boost |
| Cache | 128 MB L3 (including 64 MB stacked) and 12 MB L2 |
| Default TDP | 120 W |
| Manufacturing process | TSMC 5 nm CCDs, 6 nm I/O die |
| Memory support | DDR5 up to 5200 MT/s, two channels, up to 128 GB |
| PCI Express | PCIe 5.0, 28 lanes (24 usable) |
| Integrated graphics | AMD Radeon Graphics, 2 compute units (up to 2200 MHz) |
| Multiplier | Locked |
| ECC memory | Supported with motherboard support (unbuffered ECC) |
| Package | AM5 (LGA1718) |
| Cooler in the box | None |
| Launch price | $599 (AMD launch MSRP) |
Motherboard and chipset compatibility
AMD Ryzen 9 7900X3D 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 | Works out of the box |
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 4090, Radeon RX 7900 XTX |
| Target resolution | 4K high settings |
Twelve Zen 4 cores with stacked cache, PCIe 5.0 lanes and DDR5-5200 suit flagship 4K cards from its era. The RTX 4090 from October 2022 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 7900X3D is
The Ryzen 9 7900X3D is a twelve core, twenty-four thread processor that AMD released in February 2023 beside the 7950X3D. It belongs to the Ryzen 7000 series, codenamed Raphael, and stacks a 64 MB 3D V-Cache die on one of its two CCDs for 128 MB of total L3 with 12 MB of L2. The base clock is 4.4 GHz with boost to 5.6 GHz, and AMD rates the default TDP at 120 W.
With four fewer cores than its bigger sibling, the 7900X3D costs $100 less at a $599 launch price while keeping the full 128 MB cache that games respond to. The compute dies use TSMC 5 nm with a 6 nm I/O die. Basic Radeon graphics with two compute units cover display output, and no cooler ships in the box.
The multiplier is locked, with Curve Optimizer and EXPO profiles as the tuning path, matching the other first generation stacked parts.
Socket and motherboard compatibility
The 7900X3D fits the AM5 socket. As a 2023 part it runs natively on 600 series boards (X670E, X670, B650E, B650, A620) as well as 800 series boards, with no generational BIOS gap. Any board with a current BIOS accepts it.
Twelve cores at 120 W suit a wide spread of boards, though sustained all-core loads still want solid power stages. EXPO memory support varies by board.
Buyers comparing with the 16-core stacked flagship trade threads for savings, since gaming tracks the shared cache. The non-stacked AMD Ryzen 9 7900X below boosts slightly higher for creation.
Memory, PCIe and cooling
DDR5 up to 5200 MT/s with two modules, slower with four, over two channels to 128 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 on Gen5-wired boards. Whether the graphics slot runs Gen5 or Gen4 depends on the board design.
A 120 W rating pairs with a strong tower air cooler, and liquid cooling keeps boost sustained in long sessions. AMD bundles no cooler. The 54 × 90 mm mounting pattern matches AM4 hardware with the right kit; see the CPU cooler compatibility by socket guide.
What the stacked cache changes
Only one of the two CCDs carries the 64 MB stacked die, so the chip combines a 96 MB cache complex with a standard 32 MB complex. Cache resident games gravitate to the stacked side, while throughput work uses everything. Current chipset drivers and BIOS keep the arrangement behaving with no manual setup.
The 120 W rating against 170 W on the non-stacked 7900X shows the voltage limits of the first stacked generation. Clocks follow the cache, which is the fundamental trade of these parts.
Against the 8-core 7800X3D the 12-core chip adds threads for mixed gaming plus creation rigs, at a higher price for the same cache technology.
Upgrade paths
On AM5 the 7900X3D was the mid point of the stacked 7000 range, with Ryzen 9000 stacked parts above it now for new builds. Staying on the socket keeps board and DDR5, subject to BIOS.
Arrivals from AM4 need a new board, DDR5 and cooler hardware. The stated AM5 support through 2029 keeps later swaps on the same platform.
Frequently asked questions
What socket does the AMD Ryzen 9 7900X3D use?
It uses AM5, an LGA socket with 1,718 contacts.
Does the 7900X3D work on a B650 motherboard?
Yes. Both 600 and 800 series AM5 boards run it natively with a current BIOS.
Does the 7900X3D support DDR4?
No. AM5 is a DDR5 only platform.
Do both CCDs of the 7900X3D have stacked cache?
Only one of the two CCDs carries the 64 MB stacked die. Total L3 is 128 MB.
Does the 7900X3D come with a cooler?
No. AMD includes no cooler with the 7900X3D.
Sources and verification
Facts last checked against these sources on . Page last edited on .