AMD Ryzen 9 9900X vs AMD Ryzen 9 9900X3D Comparison

AMD Ryzen 9 9900X3D and AMD Ryzen 9 9900X are both 12-core, 24-thread Zen 5 desktop processors on the AMD Socket AM5 platform, sharing the same 4 nm TSMC process node and Granite Ridge codename. The two chips are separated by a single key specification: the 9900X3D carries 128 MB of shared L3 cache, while the 9900X carries 64 MB, and the 9900X has a 100 MHz higher boost clock at 5.60 GHz versus 5.50 GHz. Benchmark data shows the two are extraordinarily close overall, with the 9900X3D averaging 54681 across all tests and the 9900X averaging 54450, a 0.4% difference that places both at the 94th percentile among all CPUs. The head-to-head results split nearly evenly, with the 9900X3D winning 12 tests and the 9900X winning 13, but the magnitude of those wins varies wildly from a 57.9% blowout for the 3D-cache part in PassMark physics to a collection of sub-2% margins for the standard chip.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD Ryzen 9 9900X3D has an average benchmark score of 54681, which is 0.4% higher than the AMD Ryzen 9 9900X score of 54450.

Q: How do the two chips compare in L3 cache capacity?

A: The 9900X3D has 128 MB of shared L3 cache, which is double the 64 MB of shared L3 cache found on the 9900X.

Q: Is there a difference in boost clock speed between the two?

A: Yes, the 9900X has a boost clock of 5.60 GHz, while the 9900X3D has a boost clock of 5.50 GHz.

Q: What is the largest single benchmark margin between the two processors?

A: The 9900X3D leads by 57.9% in the PassMark physics test, scoring 5340 versus the 9900X’s 3381.

Q: Do both processors support ECC memory?

A: Yes, both the 9900X3D and the 9900X support ECC memory and use dual-channel DDR5 memory with 89.6 GB/s of bandwidth.

Q: Which processor wins more individual benchmark tests?

A: The 9900X wins 13 head-to-head tests, while the 9900X3D wins 12, making the standard chip the slight leader in total wins.

Architecture Differences

Both processors are built on the same Zen 5 architecture with the Granite Ridge codename and use TSMC’s 4 nm process node with 16,630 million transistors and a dual-die design sized at 2x 70.6 mm². The core configuration is identical: 12 cores, 24 threads, 80 KB of L1 cache per core, and 1 MB of L2 cache per core. The fundamental architectural divergence lies in the L3 cache, where the 9900X3D doubles the 9900X’s 64 MB shared L3 to 128 MB shared L3, a change that directly impacts workloads sensitive to cache capacity. Both chips integrate Radeon Graphics, support PCIe Gen 5 with 24 CPU lanes, and have unlocked multipliers for overclocking. The 9900X3D was released on 2025-01-05, while the 9900X launched earlier on 2024-08-14, and the 3D-cache model has a launch MSRP of $599.

The extra L3 cache on the 9900X3D does not alter the memory subsystem; both processors use dual-channel DDR5 with 89.6 GB/s of memory bandwidth and support ECC memory. The difference in boost clock is minor, with the 9900X reaching 5.60 GHz and the 9900X3D capping at 5.50 GHz, a 100 MHz gap that favors the non-3D part in single-threaded frequency-dependent tasks. The TDP is identical at 120 watts for both, and they share the same socket, motherboard compatibility, and production status as active desktop parts. The part numbers differ, with the 9900X3D listed as 100-000001386 and the 9900X as 100-000000662, but the underlying silicon is otherwise the same except for cache and clock settings.

Head-to-Head Benchmarks

The benchmark data reveals a clear pattern: the 9900X3D dominates in multi-threaded rendering and physics workloads, while the 9900X wins most lightly-threaded and math-oriented tests by thin margins. In Cinebench R23 multi-core, the 9900X3D scores 47737 versus 46438 for the 9900X, a 2.8% advantage. That same 2.8% delta repeats across Cinebench R15 multi-core (4811 vs 4680), R20 multi-core (20049 vs 19503), and R23 single-core (6739 vs 6555), showing a consistent edge for the 3D-cache part in Cinebench’s workload. Geekbench multi-core sees the 9900X3D ahead by 3.8%, scoring 20572 against the 9900X’s 19827. PassMark multithread also favors the 9900X3D at 56154 versus 54643, a 2.8% win.

The largest single margin comes in PassMark physics, where the 9900X3D scores 5340 and the 9900X scores 3381, a massive 57.9% difference that indicates the extra cache dramatically accelerates physics simulation. PassMark find prime numbers also shows a big 24.8% gap, with the 9900X3D at 544 and the 9900X at 436. In contrast, the 9900X wins all but one of the 3DMark tests, taking 16-thread (12552 vs 12490, -0.5%), 8-thread (9114 vs 9002, -1.2%), max-threads (13929 vs 13795, -1%), and single-thread (1286 vs 1269, -1.3%). The 9900X also leads in PassMark integer math (181056 vs 179727, -0.7%), floating point math (120083 vs 119622, -0.4%), and single-thread (4672 vs 4646, -0.6%). The 3DMark 4-thread test is a dead heat at 4886 vs 4885 for the 9900X, a 0% delta.

Specification Differences

The only fields where the two processors differ are L3 cache size, boost clock, release date, launch MSRP, and part number.

• L3 Cache: 128 MB (shared) on the 9900X3D vs 64 MB (shared) on the 9900X.
• Boost Clock: 5.50 GHz on the 9900X3D vs 5.60 GHz on the 9900X.
• Release Date: 2025-01-05 for the 9900X3D vs 2024-08-14 for the 9900X.
• Launch MSRP: $599 for the 9900X3D vs $499 for the 9900X.
• Part Number: 100-000001386 for the 9900X3D vs 100-000000662 for the 9900X.

All other specifications are identical: 12 cores, 24 threads, 4.40 GHz base clock, 120 W TDP, AMD Socket AM5, Zen 5 architecture, Granite Ridge codename, 4 nm TSMC process, 16,630 million transistors, 2x 70.6 mm² die size, 80 KB L1 per core, 1 MB L2 per core, DDR5 dual-channel memory, 89.6 GB/s bandwidth, ECC support, PCIe Gen 5 with 24 lanes, Radeon integrated graphics, desktop market segment, active production status, and unlocked multiplier.

Where Each One Wins

The 9900X3D is the clear choice for workloads that exploit large cache footprints. Its 57.9% win in PassMark physics and 24.8% win in PassMark find prime numbers are outliers that suggest specialized compute tasks see outsized gains from the doubled L3. Cinebench results, which are often used as a proxy for 3D rendering and content creation, consistently favor the 9900X3D by 2.8% across R15, R20, and R23 in both single- and multi-core tests. Geekbench multi-core shows a 3.8% advantage for the 9900X3D, and PassMark multithread adds another 2.8% win. The 9900X3D also takes PassMark data compression (685074 vs 683579, 0.2%) and extended instructions (55426 vs 55243, 0.3%), making it the better all-around multi-threaded processor.

The 9900X wins the majority of 3DMark tests, which emphasize lower thread counts and higher clock frequencies. It leads 3DMark single-thread by 1.3% (1286 vs 1269), 3DMark 8-thread by 1.2% (9114 vs 9002), and 3DMark max-threads by 1% (13929 vs 13795). In PassMark, the 9900X excels at integer math (0.7% ahead), floating point math (0.4% ahead), random string sorting (0.2% ahead), and single-thread (0.6% ahead). Geekbench single-core is nearly identical, with the 9900X winning by just 0.1% (3341 vs 3336). The 9900X’s higher 5.60 GHz boost clock gives it a slight edge in frequency-bound tasks, but none of its wins exceed 1.3%, whereas the 9900X3D has multiple wins above 2.8%.

The Verdict

The data does not support a universal winner; it supports a workload-specific decision. If the priority is maximum multi-threaded throughput in rendering, physics simulation, or cache-heavy compute, the 9900X3D is the superior part, with a 3.8% lead in Geekbench multi-core and a 57.9% lead in PassMark physics that cannot be ignored. Its consistent 2.8% advantage across all Cinebench tests indicates that content creation applications will see measurable gains from the 128 MB L3 cache, even though the 9900X has a 100 MHz higher boost clock. The 9900X3D also posts a higher average benchmark score overall (54681 vs 54450), reinforcing its position as the faster chip on aggregate.

For buyers focusing on gaming or lightly-threaded applications, the 9900X is the pragmatic pick. It wins all but one 3DMark test, including single-thread by 1.3% and 8-thread by 1.2%, and its PassMark single-thread score of 4672 edges the 9900X3D’s 4646. The 9900X also has a $499 launch MSRP versus $599 for the 9900X3D, making it the lower-cost option, though the overall performance delta is just 0.4% in average score. With 13 wins versus 12 for the 9900X3D, the standard chip wins more individual tests, but the 3D-cache part wins the tests that matter most for heavy compute. Choose the 9900X3D for rendering and physics-heavy workflows; choose the 9900X for mixed use where single-thread speed and a lower launch MSRP are the deciding factors.