AMD Ryzen 9 7945HX vs Intel Core i9-13900K Comparison

Head-to-Head Benchmarks

The Intel Core i9-13900K dominates the head-to-head comparison, winning 20 of the 23 recorded benchmarks against the AMD Ryzen 9 7945HX. The largest margin comes in Geekbench multicore, where the Intel part scores 22820 versus 18254, a 25% advantage. PassMark physics shows a similar gap at 25.6%, with the Intel chip scoring 3140 against 2500. Floating point math also favors Intel heavily: 151562 versus 123390, a 22.8% lead.

Single-thread performance is consistently in Intel's favor. The 3DMark single-thread test shows 1187 versus 1058, a 12.2% delta. Cinebench R23 single-core records 2238.5 against 1940, a 15.4% edge. PassMark single-thread repeats the pattern at 4608 versus 4040, a 14.1% win. Geekbench single-core adds a 9.9% advantage (2628 versus 2391). Even the tightest single-thread result, Cinebench R15 single-core, goes to Intel at 318 versus 308, a 3.2% margin.

Multi-threaded rendering also belongs to Intel. Cinebench R23 multicore scores 38271.5 against 33459, a 14.4% lead. Cinebench R15 multicore records 5805.5 versus 5289, a 9.8% gain. 3DMark max threads shows 15509 versus 13612, a 13.9% advantage. PassMark multithread lands at 58589 versus 54548, a 7.4% win. Geekbench multicore, as noted, is the largest single gap at 25%. The 3DMark 16-thread test is the exception: AMD wins 12737 versus 11201, a 12.1% margin in favor of the Ryzen.

Scaled-thread workloads favor Intel at lower thread counts. 3DMark 2 threads: 2355 versus 2063, a 14.2% win. 3DMark 4 threads: 4648 versus 3972, a 17% lead. 3DMark 8 threads: 8520 versus 7355, a 15.8% edge. The Intel part also wins data compression (793645 versus 707249, 12.2%), data encryption (46609 versus 42703, 9.1%), random string sorting (87705 versus 81736, 7.3%), and integer math, though the last is nearly a tie at 207792 versus 207524, a 0.1% margin.

AMD takes two additional wins beyond the 16-thread 3DMark result. PassMark extended instructions goes to AMD at 51834 versus 46477, a 10.3% edge. PassMark find prime numbers also favors AMD at 284 versus 236, a 16.9% lead. These wins point to specific instruction-level strengths rather than general throughput superiority.

The average benchmark scores reinforce the overall picture. The Intel i9-13900K sits at 61766 average, while the AMD Ryzen 9 7945HX records 60099. Both chips share the same 92nd percentile versus all CPUs, but the Intel part holds a higher aggregate score. Its nearest rivals include the Intel Core i9-13900T at 61723 (0.1% behind) and the Intel Core Ultra 7 270HX Plus at 61834 (0.1% ahead), while the AMD part's nearest rival is the AMD Ryzen 7 8745HX at 60104, a 0% delta.

FAQ

Q: Which processor wins more benchmarks overall?

A: The Intel Core i9-13900K wins 20 of the 23 head-to-head tests. The AMD Ryzen 9 7945HX wins three: 3DMark 16 threads, PassMark extended instructions, and PassMark find prime numbers.

Q: How large is the single-thread performance gap?

A: Intel leads in every single-thread test. The smallest margin is Cinebench R15 single-core at 3.2% (318 versus 308). The largest is PassMark single-thread at 14.1% (4608 versus 4040). Cinebench R23 single-core shows a 15.4% gap (2238.5 versus 1940).

Q: What is the biggest advantage for the AMD Ryzen 9 7945HX?

A: The largest AMD win is in PassMark find prime numbers, where it scores 284 versus 236, a 16.9% edge. Its 3DMark 16-thread win is 12737 versus 11201, a 12.1% margin. PassMark extended instructions shows a 10.3% advantage (51834 versus 46477).

Q: Do both processors have the same market percentile ranking?

A: Yes, both are recorded at the 92nd percentile versus all CPUs. However, the Intel part has a higher average benchmark score at 61766, compared to 60099 for the AMD chip.

Q: How do the two compare in memory bandwidth?

A: The AMD Ryzen 9 7945HX lists a memory bandwidth of 83.2 GB/s. The Intel Core i9-13900K has no recorded memory bandwidth figure in the database.

Q: Which chip has more cores?

A: The Intel Core i9-13900K has 24 cores and 32 threads. The AMD Ryzen 9 7945HX has 16 cores and 32 threads.

Architecture Differences

The two processors come from fundamentally different design schools. The Intel Core i9-13900K uses Raptor Lake architecture, built on Intel's 10 nm process at Intel's own foundry. The AMD Ryzen 9 7945HX uses Zen 4 architecture, built on a 5 nm process at TSMC. The AMD die is listed as 2x 71 mm² with 13,140 million transistors, while the Intel die is a single 257 mm² piece.

Core counts diverge significantly. Intel fields 24 cores and 32 threads, while AMD offers 16 cores and 32 threads. Both support dual-channel memory, but Intel supports both DDR4 and DDR5, whereas AMD supports DDR5 only. Both support ECC memory. The Intel chip includes UHD Graphics 770 integrated graphics; the AMD chip includes Radeon 610M integrated graphics.

Cache layouts differ in size and placement. Intel provides 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3. AMD provides 64 KB of L1 per core, 1 MB of L2 per core, and a larger 64 MB of shared L3. The AMD L3 pool is nearly double the Intel allocation, which helps explain its wins in extended instructions and prime number searches.

PCIe connectivity also differs. Intel offers Gen 5 with 16 CPU lanes, while AMD offers Gen 5 with 28 CPU lanes. The AMD part carries more available lanes for expansion. Both have unlocked multipliers, so overclocking is possible on either platform.

Market positioning is distinct. Intel targets the desktop segment with Socket 1700 and a 125 W TDP. AMD targets the mobile segment with Socket FL1 and a 55 W TDP. The Intel release date is 2022-09-26, while the AMD release date is 2023-01-03. The Intel chip carries a launch MSRP of $589; no launch MSRP is recorded for the AMD part.

The process node difference is notable: 10 nm for Intel versus 5 nm for AMD. The AMD design uses two chiplets at 71 mm² each, while Intel uses a single monolithic die. These architectural choices influence power characteristics and the benchmark profile, with Intel favoring high clock-driven throughput and AMD favoring efficiency and larger shared cache.

Specification Differences

The two CPUs differ on nearly every core specification. The Intel Core i9-13900K runs a base clock of 3.00 GHz and a boost clock of 5.80 GHz. The AMD Ryzen 9 7945HX runs a base clock of 2.50 GHz and a boost clock of 5.40 GHz. Intel holds the clock advantage at both ends.

Core and thread counts differ as noted: 24 cores and 32 threads for Intel, 16 cores and 32 threads for AMD. The Intel TDP is 125 W, while the AMD TDP is 55 W, reflecting the mobile target of the Ryzen part.

Process node and foundry differ: Intel uses 10 nm at Intel, AMD uses 5 nm at TSMC. Die sizes are 257 mm² for Intel versus 2x 71 mm² for AMD. Transistor count is only recorded for AMD at 13,140 million.

Cache configurations differ across all levels. Intel L1 is 80 KB per core versus 64 KB per core for AMD. Intel L2 is 2 MB per core versus 1 MB per core for AMD. Intel L3 is 36 MB shared versus 64 MB shared for AMD.

Memory support differs: Intel supports DDR4 and DDR5, AMD supports DDR5 only. Both use dual-channel memory buses. Memory bandwidth is recorded only for AMD at 83.2 GB/s. PCIe lanes differ: 16 for Intel, 28 for AMD, both Gen 5.

Integrated graphics differ: UHD Graphics 770 for Intel, Radeon 610M for AMD. Sockets differ: Intel Socket 1700 versus AMD Socket FL1. Market segments differ: Desktop for Intel, Mobile for AMD. Release dates differ: 2022-09-26 for Intel, 2023-01-03 for AMD. Part numbers are SRMBH for Intel and 100-000000870 for AMD. Both are listed as Active in production and both have unlocked multipliers.

Where Each One Wins

The Intel Core i9-13900K wins in scenarios that demand raw throughput and single-thread responsiveness. Rendering workloads like Cinebench R23 multicore (38271.5 versus 33459) and Geekbench multicore (22820 versus 18254) favor Intel. Physics calculations show a 25.6% edge, and floating point math shows a 22.8% edge. Data compression, encryption, and random string sorting all go to Intel, making it the stronger choice for general productivity and content creation tasks. The single-thread wins across every tested benchmark mean the Intel chip is also preferable for lightly threaded applications and everyday responsiveness.

The AMD Ryzen 9 7945HX wins in a narrower set of conditions. The 3DMark 16-thread test favors AMD at 12737 versus 11201, suggesting a specific advantage in that threaded workload pattern. PassMark extended instructions (51834 versus 46477) points to a strength in workloads that exercise advanced instruction sets. PassMark find prime numbers (284 versus 236) indicates a strong integer-bound, cache-sensitive workload performance, likely aided by the larger 64 MB L3 cache. The AMD chip also carries a much lower 55 W TDP, making it the more power-conscious option, and offers more PCIe lanes (28 versus 16) for expansion-heavy mobile platforms.

For users prioritizing memory flexibility, Intel supports both DDR4 and DDR5, while AMD is DDR5-only. For users prioritizing cache capacity, AMD offers 64 MB of L3 versus 36 MB. For users prioritizing raw clock speed, Intel leads at 5.80 GHz boost versus 5.40 GHz.

The Verdict

The data points to a clear winner for most use cases: the Intel Core i9-13900K. It wins 20 of 23 benchmark comparisons, holds a higher average benchmark score (61766 versus 60099), and leads in every single-thread test recorded. Its advantages in Cinebench, Geekbench, PassMark multithread, floating point math, and physics make it the stronger choice for rendering, productivity, and general compute workloads. The 25% Geekbench multicore lead is the single largest margin in the comparison.

The AMD Ryzen 9 7945HX is the better pick only in specific situations. It wins the 3DMark 16-thread test, extended instructions, and prime number searches. Its larger 64 MB L3 cache and lower 55 W TDP make it an attractive option for power-constrained mobile platforms, and its 28 PCIe lanes exceed the Intel part's 16. The AMD chip matches Intel's 32 threads but does so with 16 cores rather than 24.

The verdict depends on the platform. For a desktop build where power draw is less critical and maximum multi-threaded and single-threaded performance is the goal, the Intel Core i9-13900K is the data-backed choice. For a mobile system where the 55 W TDP and cache-heavy workload strengths matter, the AMD Ryzen 9 7945HX has a defined, if narrower, role. Both sit at the 92nd percentile, but the Intel part's broader benchmark dominance gives it the overall edge in the recorded measurements.