AMD Ryzen 9 9900X vs Intel Core i9-13900 Comparison

Head-to-Head Benchmarks

The benchmark comparison between the AMD Ryzen 9 9900X and Intel Core i9-13900 is decisively lopsided, with the AMD part taking 12 of 17 recorded tests. The most dramatic separation comes in PassMark's prime number finding workload, where the Ryzen 9 9900X scores 436 against Intel's 186, a 134.4% advantage. That is the single largest delta in the entire comparison, and it reflects a fundamental difference in how each architecture handles integer-heavy, branch-dense code.

Extended instruction throughput tells a similar story. The AMD chip records 55,243 in PassMark's extended instructions test, versus 32,760 for the Intel part, a 68.6% margin. Physics simulation also favors AMD heavily: 3,381 versus 2,484, a 36.1% lead. In Cinebench R15 multi-core, the Ryzen 9 9900X posts 5,008 against 3,823, a 31% win. PassMark multi-thread shows 54,643 versus 45,680, a 19.6% gap. Data compression is another AMD stronghold at 683,579 versus 577,285, an 18.4% improvement.

The Intel Core i9-13900 does take five tests, and some of those wins are substantial. The single-core Cinebench results are striking: in R23 single-core, Intel scores 5,355 versus AMD's 2,253, a 57.9% lead. In R15 single-core, Intel wins 539 to 353, a 34.5% margin. Those are the two biggest Intel victories, and they are enormous. The i9-13900 also wins Cinebench R23 multi-core with 37,931 versus 32,172, a 15.2% advantage, despite losing the older R15 multi-core test. Data encryption goes Intel's way by a slim 5.2% (35,242 versus 33,421), and floating-point math is essentially a tie at 120,492 versus 120,083, a 0.3% Intel edge.

AMD's wins in Geekbench are notable. The Ryzen 9 9900X scores 22,174 multi-core versus 21,164, a 4.8% lead, and 3,010 single-core versus 2,604, a 15.6% margin. PassMark integer math goes AMD's way at 181,056 versus 176,107 (2.8%), random string sorting favors AMD at 72,013 versus 64,396 (11.8%), and single-thread PassMark shows AMD at 4,672 versus 4,309 (8.4%).

The overall average benchmark scores put the Intel part higher in the database at 60,676 versus 57,498, a 5.5% gap in the aggregate. However, that aggregate is skewed by the extreme single-core Cinebench deltas. In workload diversity, the Ryzen 9 9900X wins more tests and wins by larger margins in the majority of categories.

Architecture Differences

The two processors come from fundamentally different design philosophies. The AMD Ryzen 9 9900X is built on TSMC's 4 nm process, using the Zen 5 architecture (Granite Ridge) with 12 cores and 24 threads. The Intel Core i9-13900 uses Raptor Lake-S on Intel's 10 nm node, with 24 cores and 32 threads. The core count difference is substantial, yet AMD still manages to win the majority of multi-threaded tests.

Cache configurations diverge sharply. Both use 80 KB of L1 per core, but the AMD chip has 1 MB of L2 per core versus Intel's 2 MB per core. The L3 cache is the bigger differentiator: AMD offers 64 MB total, while Intel has 36 MB shared. That larger L3 pool helps explain AMD's dominance in data compression and prime number workloads, which often benefit from larger working sets resident in cache.

Memory support differs as well. The AMD part supports DDR5 only, with dual-channel memory and a recorded bandwidth of 89.6 GB/s. The Intel chip supports both DDR4 and DDR5, also dual-channel, but no bandwidth figure is recorded in the database. Both support ECC memory, which matters for workstation users.

PCIe connectivity favors AMD: 24 Gen 5 lanes (CPU only) versus Intel's 16 Gen 5 lanes. The integrated graphics also differ, with AMD using Radeon Graphics and Intel using UHD Graphics 770. The AMD processor has an unlocked multiplier and a launch MSRP of $499, while the Intel part is locked and launched at $549.

The die size and transistor counts tell a story of process advantage. AMD's Granite Ridge uses two chiplets, each 70.6 mm², totaling 16,630 million transistors. Intel's monolithic die is 257 mm², and no transistor count is recorded. The AMD approach allows the smaller, denser chiplets to run on a leading-edge process, while Intel's larger die on 10 nm faces different trade-offs.

Clock speeds are similar at the top end: both boost to 5.60 GHz. The base clocks differ dramatically, with AMD at 4.40 GHz and Intel at 2.00 GHz. The Intel part compensates with its higher core and thread count, but the low base clock and high boost suggest a power-management strategy that relies on short bursts.

Where Each One Wins

The Ryzen 9 9900X is the clear choice for compute-heavy, parallel workloads that stress integer math, compression, and extended instruction sets. Its 134.4% lead in prime number finding and 68.6% lead in extended instructions indicate a strong SIMD and branch-prediction advantage. The 36.1% physics win and 31% Cinebench R15 multi-core win reinforce that this chip handles sustained multi-threaded rendering and simulation tasks well. Data compression at 18.4% ahead makes it suitable for archiving, database operations, and file-server workloads.

The Intel Core i9-13900 dominates in single-core Cinebench, with a 57.9% lead in R23 single-core and 34.5% in R15 single-core. Those results suggest the Intel architecture has a significant per-thread advantage in legacy rendering workloads that rely on a single thread. The 15.2% win in Cinebench R23 multi-core shows that when a benchmark scales heavily with core count and the Intel chip can engage all 24 cores, it can outpace AMD's 12-core part. Data encryption at 5.2% ahead is a narrow but consistent Intel strength, and floating-point math is effectively tied.

For general productivity, the Geekbench results favor AMD in both single-core (15.6%) and multi-core (4.8%). PassMark single-thread also goes AMD's way at 8.4%. The pattern is clear: AMD wins in modern, diverse workloads, while Intel retains an edge in specific legacy single-threaded Cinebench scenarios and in raw core-count scaling under that same benchmark.

FAQ

Q: Which processor has a higher core count?

A: The Intel Core i9-13900 has 24 cores and 32 threads, while the AMD Ryzen 9 9900X has 12 cores and 24 threads.

Q: How large is the L3 cache difference?

A: AMD offers 64 MB of L3 cache, while Intel has 36 MB shared. Both use 80 KB of L1 per core, but Intel has 2 MB of L2 per core versus AMD's 1 MB.

Q: Which CPU wins in Cinebench R23 multi-core?

A: The Intel Core i9-13900 wins with 37,931 versus 32,172, a 15.2% margin. However, AMD wins the older R15 multi-core test by 31%.

Q: What is the single-thread performance gap in PassMark?

A: The AMD Ryzen 9 9900X scores 4,672 versus 4,309, a 8.4% lead in PassMark single-thread.

Q: Do both CPUs support ECC memory?

A: Yes, both the AMD Ryzen 9 9900X and Intel Core i9-13900 support ECC memory. The AMD part supports DDR5 only, while Intel supports both DDR4 and DDR5.

Q: How does PCIe lane count compare?

A: AMD offers 24 Gen 5 lanes (CPU only), while Intel offers 16 Gen 5 lanes (CPU only).

The Verdict

The data supports a clear split based on workload. For users who prioritize diverse, modern multi-threaded tasks, the AMD Ryzen 9 9900X is the stronger part. It wins 12 of 17 head-to-head tests, including substantial leads in prime number finding, extended instructions, physics, data compression, and PassMark multi-thread. The 4.8% Geekbench multi-core win and 15.6% single-core win suggest that in real-world applications, the Zen 5 architecture delivers more consistent performance across a wide range of instruction mixes.

The Intel Core i9-13900 remains the pick for specific legacy single-threaded Cinebench workloads. Its 57.9% lead in R23 single-core and 34.5% in R15 single-core are enormous, and the 15.2% R23 multi-core win shows that Intel can out-muscle AMD in that specific rendering benchmark. However, those wins are concentrated in one benchmark family. Outside of Cinebench, Intel wins only encryption by a slim margin and floating-point math by a rounding error.

The average benchmark scores favor Intel at 60,676 versus 57,498, but that aggregate is driven heavily by the Cinebench single-core outliers. The database's nearest rival data places both chips at the 92nd percentile among all CPUs, indicating that either processor is top-tier. The AMD part sits near the AMD EPYC 9015 (0.1% below) and AMD EPYC 7313 (0.2% above), while Intel sits near the Intel Xeon Gold 6338T (0.2% above) and AMD Ryzen 7 8745HX (1.0% above). Both are premium desktop processors, but the recorded benchmark distribution makes the AMD Ryzen 9 9900X the more versatile choice for mixed workloads, while the Intel Core i9-13900 is the specialist for Cinebench-centric workflows.