AMD Ryzen 9 7900X vs Intel Core Ultra 5 245KF Comparison

The data presents a fascinating split: Intel’s Core Ultra 5 245KF and AMD’s Ryzen 9 7900X are nearly inseparable in overall standing, both holding a 91st percentile rank among all CPUs. Their average benchmark scores differ by only 3.4% (55,093 vs 53,288), yet the workloads where each dominates are starkly different. The 7900X wins 8 of the 15 head-to-head tests, while the 245KF takes 7, but the margins tell the real story. This is not a simple "which is faster" question; it is a question of which type of computing you prioritize.

The Verdict

The AMD Ryzen 9 7900X is the clear choice for heavily threaded, throughput-oriented workloads. Its wins in passmark integer math (169,273 vs 98,854, a 41.6% advantage), data compression (632,505 vs 460,123, a 27.3% lead), and random string sorting (74,658 vs 55,206, a 26.1% edge) make it the superior engine for productivity tasks like video encoding, data processing, and compilation. The 7900X also leads in the multithreaded passmark score (51,406 vs 43,110, a 16.1% gap) and in the legacy cinebench R15 multicore test (4,820.5 vs 3,693, a 23.4% advantage), demonstrating its strength across different generations of multi-core benchmarks.

For users whose workloads are single-threaded or latency-sensitive, the Intel Core Ultra 5 245KF is the definitive winner. The data here is decisive: the 245KF leads by 156.5% in cinebench R23 single-core (5,173 vs 2,016.5) and by 61.3% in R15 single-core (521 vs 323). It also wins passmark single-thread (4,715 vs 4,238, an 11.3% lead) and the modern cinebench R23 multicore test (36,647 vs 29,300, a 25.1% advantage), which notably contradicts the R15 multicore result. The 245KF also excels in floating-point math (131,546 vs 103,952, a 26.5% lead) and prime number finding (416 vs 388, a 7.2% edge), hinting at a different architectural strength. If your software is not fully scaling to 24 threads, the 245KF’s per-core performance will likely feel snappier.

Architecture Differences

The foundational architectures could not be more different. The 245KF is built on Arrow Lake-S, a 3nm TSMC process, housing 17,800 million transistors on a 243 mm² die. Its configuration is 14 cores and 14 threads, meaning no hyperthreading. Each core has 192 KB of L1 and 3 MB of L2, with a shared 24 MB L3 cache. The 7900X, in contrast, uses Zen 4 (Raphael), fabricated on a 5nm process with 13,140 million transistors spread across two 71 mm² dies. It offers 12 cores and 24 threads, relying on simultaneous multithreading to double its thread count. Each core carries 64 KB of L1 and 1 MB of L2, but the big difference is the L3 cache: 64 MB shared, nearly triple the Intel’s.

The process node disparity (3nm vs 5nm) and the transistor count difference (17.8 billion vs 13.14 billion) explain why Intel achieves higher single-core scores despite having fewer threads. The AMD chip compensates with a much larger L3 cache and double the thread count (24 vs 14), which is a major factor in its integer math and compression victories. The 7900X also features integrated Radeon Graphics, while the 245KF has no integrated graphics (N/A). On the memory side, both support DDR5 dual-channel, but Intel lists a higher theoretical bandwidth (102.4 GB/s vs 83.2 GB/s). The AMD chip supports ECC memory (true), while the Intel does not (false). PCIe lanes also differ: Intel provides Gen 5 with 20 lanes, while AMD offers Gen 5 with 24 lanes.

Head-to-Head Benchmarks

The most dramatic divergence is in the Cinebench suite. In R23 single-core, the Intel chip scores 5,173 against AMD’s 2,016.5, a staggering 156.5% delta. This is not a marginal win; it is a generational leap in per-core efficiency. Even in the older R15 single-core test, Intel leads 521 to 323 (61.3%). However, the R15 multicore test flips the script: AMD wins 4,820.5 to 3,693 (a 23.4% Intel deficit). This is particularly interesting because in R23 multicore, Intel wins 36,647 to 29,300 (a 25.1% lead). The data suggests that R15 multicore may not scale well with the Intel’s 14 non-threaded cores, while the AMD’s 24 threads shine in that legacy workload. In modern R23 multicore, Intel’s superior single-core strength carries the day.

The Passmark suite reveals the 7900X’s domain. The largest margin is in integer math, where AMD scores 169,273 versus Intel’s 98,854, a 41.6% blowout. Data compression follows closely, with AMD at 632,505 versus 460,123 (27.3% lead). Random string sorting (74,658 vs 55,206, 26.1% lead) and extended instructions (47,619 vs 37,912, 20.4% lead) also favor AMD. These are classic throughput tests that reward high thread counts and large caches. Conversely, the 245KF wins the floating-point math test decisively (131,546 vs 103,952, a 26.5% lead) and the find-prime-numbers test (416 vs 388, a 7.2% lead). The single-thread passmark score (4,715 vs 4,238) gives Intel an 11.3% edge, reinforcing the single-core narrative.

FAQ

Q: Which CPU has a higher average benchmark score?

A: The Intel Core Ultra 5 245KF has a slightly higher average benchmark score of 55,093 compared to the AMD Ryzen 9 7900X’s 53,288, a difference of about 3.4%.

Q: Why does the Ryzen 9 7900X win the Cinebench R15 multicore test but lose the R23 multicore test?

A: The 7900X wins R15 multicore with 4,820.5 vs 3,693 (a 23.4% margin), but loses R23 multicore with 29,300 vs 36,647 (a 25.1% deficit). The data indicates that the 24-thread AMD chip performs better in the older R15 test, while the 14-thread Intel chip’s superior single-core performance (156.5% lead in R23 single-core) allows it to dominate the newer R23 multi-core workload.

Q: Is the Intel Core Ultra 5 245KF always faster in single-threaded tasks?

A: Yes, across all available single-thread tests, the 245KF wins. It leads by 61.3% in Cinebench R15 single-core, 156.5% in Cinebench R23 single-core, and 11.3% in the Passmark single-thread test.

Q: What is the most significant benchmark difference between these two CPUs?

A: The most significant difference is in Cinebench R23 single-core, where the Intel chip scores 5,173 versus AMD’s 2,016.5, a 156.5% delta. The largest AMD victory is in Passmark integer math, with a 41.6% lead (169,273 vs 98,854).

Q: Does the Ryzen 9 7900X have more cores and threads?

A: No, the 7900X has 12 cores and 24 threads, while the 245KF has 14 cores and 14 threads. The AMD chip uses simultaneous multithreading to achieve its higher thread count, despite having fewer physical cores.

Q: Which CPU supports ECC memory?

A: The AMD Ryzen 9 7900X supports ECC memory (true), while the Intel Core Ultra 5 245KF does not (false).

Where Each One Wins

The AMD Ryzen 9 7900X is the winner for any workload that can use more than 14 threads. Its 24-thread count and 64 MB L3 cache drive massive wins in integer math (41.6% lead), data compression (27.3% lead), and random string sorting (26.1% lead). The data also shows a 16.1% lead in the overall Passmark multithread score (51,406 vs 43,110) and a 20.4% lead in extended instructions (47,619 vs 37,912). For video rendering, database operations, scientific computing, or any task that scales with core count, the 7900X is the data-backed choice. It also wins the physical passmark physics test (3,060 vs 2,998, a 2% lead) and data encryption (37,263 vs 33,381, a 10.4% lead).

The Intel Core Ultra 5 245KF is the winner for single-threaded and lightly threaded applications. The 156.5% lead in Cinebench R23 single-core and 61.3% lead in R15 single-core are massive. It also wins in floating-point math (26.5% lead), which is crucial for certain scientific simulations and 3D rendering workloads that rely on FPU performance rather than integer throughput. The 245KF also wins the modern Cinebench R23 multicore test (25.1% lead), suggesting that for newer multi-core benchmarks, its per-core efficiency is more valuable than raw thread count. For gaming, general desktop responsiveness, and applications with poor multi-thread scaling, the 245KF’s single-core dominance makes it the stronger pick.

Specification Differences

The architectural split is reflected in their specifications. The Intel Core Ultra 5 245KF has 14 cores and 14 threads, while the AMD Ryzen 9 7900X has 12 cores and 24 threads. The base and boost clocks differ: Intel runs at 4.20 GHz base and 5.20 GHz boost, while AMD runs higher at 4.70 GHz base and 5.60 GHz boost. However, the TDP is inverted: the Intel chip draws 125W, while the AMD chip is rated at 170W. The process node favors Intel (3nm vs 5nm), as does the transistor count (17,800 million vs 13,140 million) and die size (243 mm² vs 2x 71 mm²).

Cache configurations are radically different. Intel provides 192 KB L1 and 3 MB L2 per core, with 24 MB shared L3. AMD provides 64 KB L1 and 1 MB L2 per core, but with a much larger 64 MB shared L3. Both support dual-channel DDR5 memory, but Intel lists a higher memory bandwidth (102.4 GB/s vs 83.2 GB/s). The AMD chip supports ECC memory, while the Intel does not. PCIe connectivity also differs: Intel has Gen 5 with 20 lanes, while AMD has Gen 5 with 24 lanes. The AMD Ryzen 9 7900X includes integrated Radeon Graphics, whereas the Intel Core Ultra 5 245KF has no integrated graphics. Both have unlocked multipliers and target the desktop segment. The Intel part is newer (released 2024-10-23) compared to AMD (released 2022-09-26), and its launch MSRP is $294, while the AMD’s launch MSRP is $549.