AMD Ryzen 9 9900X or AMD Ryzen 7 9800X3D
Choose the 9800X3D for a gaming PC: AMD builds it around 96 MB of 3D V-Cache for games. Choose the 9900X for work that keeps many cores busy, rendering, encoding or compiling, where its twelve cores lead.
The decision
Which one to buy
AMD Ryzen 9 9900X
Choose the 9900X if you render, encode or compile: twelve cores and a higher clock for all-core work.
AMD Ryzen 7 9800X3D
Choose the 9800X3D if the PC is mainly for games: eight cores with 96 MB of 3D V-Cache, AMD's gaming design.
Cheapest new listing at Newegg: Ryzen 9 9900X, $379.00; Ryzen 7 9800X3D, $444.00, $65.00 more. Prices checked 31 October 2026, before tax and shipping.
Blender's CPU rendering benchmark: Ryzen 9 9900X 501 (382 submissions); Ryzen 7 9800X3D 334 (1084 submissions). Higher renders faster; it measures rendering, not games. Scores from Blender Open Data (CC0).
The comparison
What differs
3 of 5 fields differ. Both sides of every row come from a published manufacturer document, cited on the row itself, with what the difference does once the parts are in a case.
| Field | AMD Ryzen 9 9900X | AMD Ryzen 7 9800X3D | What the difference does |
|---|---|---|---|
| Cores and threads | 12 cores, 24 threads12 coresamd.com | 8 cores, 16 threads8 coresamd.com | Twelve cores against eight gives the 9900X half as much again for work that splits across cores. |
| Boost clock | Up to 5.6 GHzamd.com | Up to 5.2 GHzamd.com | The 9900X boosts up to 0.4 GHz higher than the 9800X3D. |
| L3 cache | 64 MB64 MB L3 cacheamd.com | 96 MB, with AMD 3D V-Cache96 MB L3 cacheamd.com | The 9800X3D has 96 MB of L3 cache with 3D V-Cache, which is what AMD sells it on for games; the 9900X has 64 MB. |
This comparison comes from published specifications, not from testing. We do not test hardware, and we never present a judgment as though we had. Current affiliate offers stay on category pages and do not determine this specification comparison.
In full
The comparison in detail
AMD lists neither with a cooler in the box.
The page above prices both today and gives their Blender CPU rendering scores, which reward cores, not games.
| Property | AMD Ryzen 9 9900X | AMD Ryzen 7 9800X3D | What it changes | Evidence |
|---|---|---|---|---|
| Platform | AM5 socket, DDR5 memory | AM5 socket, DDR5 memory | The 9900X and 9800X3D take the same AM5 board and DDR5 kit, so this choice changes only the processor line. | 9900X, 9800X3D, Updated 22 October 2026 |
| Cores and threads | 12 cores, 24 threads | 8 cores, 16 threads | Twelve cores against eight gives the 9900X half as much again for work that splits across cores. | 9900X, 9800X3D, Updated 22 October 2026 |
| Boost clock | Up to 5.6 GHz | Up to 5.2 GHz | The 9900X boosts up to 0.4 GHz higher than the 9800X3D. | 9900X, 9800X3D, Updated 22 October 2026 |
| L3 cache | 64 MB | 96 MB, with AMD 3D V-Cache | The 9800X3D has 96 MB of L3 cache with 3D V-Cache, which is what AMD sells it on for games; the 9900X has 64 MB. | 9900X, 9800X3D, Updated 22 October 2026 |
| Rated power | 120 W default TDP | 120 W default TDP | Both carry a 120 W rating, so one cooler and power supply plan fits either. | 9900X, 9800X3D, Updated 22 October 2026 |
Where next