AMD Ryzen 9 7945HX3D vs Intel Core i9-13900K Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive overall victory for the Intel Core i9-13900K, which takes 18 of the 23 head-to-head benchmark comparisons. The AMD Ryzen 9 7945HX3D claims the remaining 5 wins, but they are concentrated in specific workload categories that reveal a distinct performance profile.

The largest margin of victory for Intel comes in Geekbench multicore, where the i9-13900K scores 22,820 against the Ryzen's 16,758, a commanding 36.2% advantage. This is not an isolated result; the 3DMark max-threads test shows a 19.9% lead for Intel (15,509 versus 12,936), and the 4-thread test shows an 18.1% edge (4,648 versus 3,937). The pattern suggests that Intel's hybrid architecture scales more effectively across thread counts, particularly in the mid-range of 4 to 8 threads where it posts 16.2% and 18.1% leads respectively.

Cinebench results reinforce this picture. In Cinebench R23 multicore, Intel scores 38,271.5 against AMD's 32,782, a 16.7% advantage. The single-core variant shows a 15.7% lead for Intel (2,238.5 versus 1,935), which is notable given that AMD's Geekbench single-core score actually wins by 5.1% (2,769 versus 2,628). This discrepancy between benchmarks suggests the two processors excel under different single-threaded workloads.

The AMD Ryzen 9 7945HX3D's wins are concentrated in areas that highlight its strengths. The most dramatic is PassMark find prime numbers, where AMD scores 446 versus Intel's 236, a 47.1% advantage. This is a massive victory and points to the 3D V-Cache's impact on certain algorithmic workloads. AMD also wins PassMark extended instructions by 11.2% (52,310 versus 46,477) and PassMark physics by 27.3% (4,321 versus 3,140). The 3DMark 16-thread test goes to AMD by 10.1% (12,459 versus 11,201), further suggesting that AMD's cache strategy provides benefits in specific throughput scenarios.

Intel counters with a 24.6% lead in PassMark floating point math (151,562 versus 121,619), a 13.8% edge in PassMark single thread (4,608 versus 4,050), and a 13.4% win in data compression (793,645 versus 699,988). The data encryption test shows a 10% lead for Intel (46,609 versus 42,367), and integer math is close at 3.3% in Intel's favor (207,792 versus 201,217). PassMark multithread is nearly even, with Intel ahead by just 1.9% (58,589 versus 57,476).

Architecture Differences

The fundamental architectural split between these two processors explains much of the benchmark divergence. The Intel Core i9-13900K uses Raptor Lake architecture on a 10 nm process at Intel's foundry, while the AMD Ryzen 9 7945HX3D uses Zen 4 architecture on a 5 nm process at TSMC. The process node difference is significant, with AMD's smaller node potentially contributing to its efficiency profile.

Core counts differ substantially. Intel packs 24 cores and 32 threads, while AMD provides 16 cores and 32 threads. Both processors support 32 threads, but Intel achieves this through a hybrid arrangement of performance and efficiency cores, whereas AMD uses a more traditional homogeneous core layout. The thread parity means multithreaded workloads see similar scheduling flexibility, but the core composition affects how those threads are distributed.

Cache configuration is where AMD's design philosophy becomes evident. The Ryzen 9 7945HX3D features 128 MB of shared L3 cache, which includes a dedicated 64 MB 3D V-Cache slice. Intel's L3 cache is 36 MB shared. Per-core L1 and L2 caches are also smaller on AMD: 64 KB L1 and 1 MB L2 per core versus Intel's 80 KB L1 and 2 MB L2 per core. This massive L3 advantage for AMD explains its dominance in cache-sensitive workloads like prime number finding and physics simulations.

Clock speeds favor Intel with a base clock of 3.00 GHz and boost of 5.80 GHz, compared to AMD's 2.30 GHz base and 5.40 GHz boost. The TDP figures are dramatically different, with Intel rated at 125 W and AMD at 55 W. This reflects their market positioning, as Intel targets desktop while AMD targets mobile. AMD's transistor count is listed at 17,840 million across a die size of 2x 71 mm², while Intel's die size is 257 mm².

Memory support also differs. Intel supports both DDR4 and DDR5, while AMD supports DDR5 only. Both use dual-channel memory buses, but AMD lists a memory bandwidth of 83.2 GB/s while Intel's figure is not recorded. PCIe lanes favor AMD with Gen 5, 28 lanes versus Intel's Gen 5, 16 lanes. Integrated graphics differ as well: Intel uses UHD Graphics 770, AMD uses Radeon 610M.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i9-13900K has an average benchmark score of 61,766, while the AMD Ryzen 9 7945HX3D has an average of 59,641. Both processors sit at the 92nd percentile among all CPUs.

Q: How do their nearest rivals compare to each processor?

A: The Intel i9-13900K sits within 0.1% of the Intel Core i9-13900T and Intel Core i9-13900KF, and within 0.7% of the Intel Xeon 636. The AMD Ryzen 9 7945HX3D is 0.6% behind the Intel Core i9-14900F, 0.8% behind the AMD Ryzen 9 7945HX, and 1.2% ahead of the AMD Ryzen 5 PRO 9645.

Q: What is the most lopsided benchmark result between these two?

A: The PassMark find prime numbers test is the most lopsided, with AMD scoring 446 versus Intel's 236, a 47.1% advantage for AMD. Conversely, the Geekbench multicore test gives Intel a 36.2% lead (22,820 versus 16,758).

Q: Do both processors support ECC memory?

A: Yes, both the Intel Core i9-13900K and the AMD Ryzen 9 7945HX3D support ECC memory. However, Intel supports both DDR4 and DDR5 memory types, while AMD supports DDR5 only.

Q: Are both processors unlocked for overclocking?

A: Yes, both processors have an unlocked multiplier. Intel's part number is SRMBH, and AMD's part number is 100-000001086.

Q: How does the 3D V-Cache affect AMD's performance?

A: The 3D V-Cache is a 64 MB slice that contributes to AMD's 128 MB total L3 cache. The benchmark data shows AMD winning cache-sensitive tests like PassMark find prime numbers by 47.1% and PassMark physics by 27.3%, suggesting the additional cache provides substantial benefits in those workloads.

Specification Differences

The two processors differ across nearly every major specification category. The Intel Core i9-13900K offers 24 cores and 32 threads, while the AMD Ryzen 9 7945HX3D offers 16 cores and 32 threads. Base clocks are 3.00 GHz for Intel versus 2.30 GHz for AMD, and boost clocks are 5.80 GHz versus 5.40 GHz. TDP is 125 W for Intel and 55 W for AMD.

Architecture differs completely: Intel uses Raptor Lake on a 10 nm process at Intel's foundry, while AMD uses Zen 4 on a 5 nm process at TSMC. AMD lists 17,840 million transistors across 2x 71 mm² dies, while Intel's die size is 257 mm². Cache configurations diverge significantly: Intel has 80 KB L1 and 2 MB L2 per core with 36 MB shared L3, while AMD has 64 KB L1 and 1 MB L2 per core with 128 MB shared L3 including a 64 MB 3D V-Cache slice.

Memory support sees Intel accepting both DDR4 and DDR5, while AMD accepts DDR5 only. Both use dual-channel buses, but AMD lists 83.2 GB/s bandwidth while Intel's is not recorded. PCIe lanes favor AMD at Gen 5, 28 lanes versus Intel's Gen 5, 16 lanes. Integrated graphics are UHD Graphics 770 for Intel and Radeon 610M for AMD. Market segments are Desktop for Intel and Mobile for AMD. Release dates are September 26, 2022 for Intel and July 26, 2023 for AMD. Intel has a launch MSRP of $589, while AMD's launch MSRP is not recorded.

The Verdict

The data presents a clear split personality between these two processors. The Intel Core i9-13900K wins 18 of 23 benchmarks and holds a 3.6% average benchmark score advantage (61,766 versus 59,641). Its wins span the breadth of testing: all 3DMark thread tests except 16-thread, all Cinebench tests, Geekbench multicore, and most PassMark workloads. The margins range from narrow (1.9% in PassMark multithread) to decisive (36.2% in Geekbench multicore).

The AMD Ryzen 9 7945HX3D wins 5 benchmarks, and its victories are not marginal. The 47.1% lead in prime number finding and 27.3% lead in physics are among the largest margins in the entire comparison. The 11.2% win in extended instructions and 10.1% win in 3DMark 16-thread show that AMD's cache strategy delivers real benefits in specific scenarios. The 5.1% Geekbench single-core win indicates AMD can also compete in certain single-threaded tasks.

For users prioritizing broad multi-threaded performance, rendering workloads, and general productivity, the Intel Core i9-13900K is the stronger choice based on its Cinebench R23 multicore lead of 16.7% and Geekbench multicore lead of 36.2%. For workloads that stress cache hierarchies, particularly prime number calculations, physics simulations, and extended instruction sets, the AMD Ryzen 9 7945HX3D demonstrates superiority. The 55 W TDP versus 125 W TDP also suggests AMD's mobile-focused design could be more appropriate for constrained power environments, though the database does not record direct performance-per-watt measurements.

Where Each One Wins

The Intel Core i9-13900K dominates in rendering and content creation workloads based on Cinebench results. Its R23 multicore score of 38,271.5 versus AMD's 32,782 represents a 16.7% advantage, and R15 multicore shows a smaller but still positive 3.7% lead. The 24.6% advantage in floating point math (151,562 versus 121,619) further supports Intel's strength in numerically intensive applications. Data compression also favors Intel by 13.4% (793,645 versus 699,988), making it the better option for file archiving and database workloads.

The AMD Ryzen 9 7945HX3D claims its territory in cache-sensitive and specialized workloads. The 47.1% lead in prime number finding (446 versus 236) is the starkest example, indicating that algorithms with repetitive memory access patterns benefit enormously from the 128 MB L3 cache. Physics calculations show a 27.3% advantage (4,321 versus 3,140), and extended instruction processing wins by 11.2% (52,310 versus 46,477). The 3DMark 16-thread win by 10.1% (12,459 versus 11,201) suggests that certain gaming or simulation workloads that use 16 threads may prefer AMD's configuration.

Single-threaded performance is split. Intel wins 3DMark single-thread by 10.8% (1,187 versus 1,071) and PassMark single-thread by 13.8% (4,608 versus 4,050), but AMD wins Geekbench single-core by 5.1% (2,769 versus 2,628). Cinebench R15 single-core is close, with Intel ahead by just 2.3% (318 versus 311). This indicates that the choice depends on the specific single-threaded application, with Intel generally ahead in 3DMark and PassMark workloads while AMD leads in Geekbench-style tasks.

Encryption and integer math are nearly even, with Intel ahead by 10% in data encryption (46,609 versus 42,367) and 3.3% in integer math (207,792 versus 201,217). Random string sorting favors Intel by 4.5% (87,705 versus 83,919). The overall multithread scores are within 1.9% of each other, suggesting that for mixed workloads, the two processors are far more similar than their individual benchmark wins might suggest.