AMD EPYC 7303 vs Intel Core Ultra X9 388H Comparison

Head-to-Head Benchmarks

The head-to-head data shows a clear split between two very different workloads. The Intel Core Ultra X9 388H wins 11 of the 17 recorded tests, while the AMD EPYC 7303 takes 6. But the margins tell a more nuanced story than the raw win count.

The Intel part's most dominant result is in PassMark single-thread performance, where it scores 4280 against the EPYC's 1460, a 65.9% advantage. That is the largest delta in the entire comparison. The same pattern appears in PassMark physics, where Intel leads 3226 to 1792, a 44.5% edge, and in floating-point math, where it posts 112550 versus 64940, a 42.3% gap. These are the kinds of workloads that reward high clock speeds and modern single-core efficiency.

The Intel chip also wins the Cinebench R20 multi-core test with 13101 points against 10200, a 22.1% lead, and the R15 multi-core test at 2955 versus 2448, a 17.2% margin. In the PassMark multi-thread test, it extends that lead to 36811 against 28572, a 22.4% advantage. Even in random string sorting, a more niche workload, Intel edges ahead with 44010 versus 42259, a 4% margin. Data encryption also favors Intel, 28490 to 25167, an 11.7% gap.

The AMD EPYC 7303 fights back in the newer Cinebench R23 tests. In R23 multi-core, it scores 24286 against the Intel part's 18911, a 28.4% lead. The single-core R23 result is even more lopsided in AMD's favor: 3428 versus 2200.5, a 55.8% advantage. This is a striking reversal given the Intel part's dominance in other single-threaded metrics.

PassMark integer math heavily favors AMD at 113422 versus 90882, a 24.8% lead, and data compression also goes AMD's way at 428319 versus 361763, an 18.4% margin. The extended instructions test is a narrow AMD win, 31603 to 29943, a 5.5% edge. The R15 single-core test is also an AMD win at 345 versus 309.5, an 11.5% margin.

The overall averages place the AMD part at an average benchmark score of 45960 and the Intel part at 44466. The AMD chip sits at the 89th percentile against all CPUs, while the Intel part is at the 88th percentile. Both are effectively in the same performance tier overall, but their strengths are pointed in entirely different directions.

FAQ

Q: Does the AMD EPYC 7303 have more threads than the Intel Core Ultra X9 388H?

A: Yes. The EPYC 7303 has 32 threads from 16 cores, while the Core Ultra X9 388H has 16 threads from 16 cores. That is a 2:1 thread advantage for AMD.

Q: Which processor has the higher boost clock?

A: The Intel Core Ultra X9 388H boosts to 5.10 GHz, while the AMD EPYC 7303 boosts to 3.40 GHz. Intel's chip also has a lower base clock of 2.10 GHz compared to AMD's 2.40 GHz.

Q: Which processor supports ECC memory?

A: Only the AMD EPYC 7303 supports ECC memory. The Intel Core Ultra X9 388H does not list ECC support in the database.

Q: How do the two compare in memory bandwidth?

A: The AMD EPYC 7303 has an eight-channel DDR4 memory bus with 204.8 GB/s of bandwidth. The Intel Core Ultra X9 388H uses dual-channel LPDDR5X with 153.6 GB/s. AMD's platform offers 51.2 GB/s more memory bandwidth.

Q: Which chip has the larger L3 cache?

A: The AMD EPYC 7303 has 64 MB of shared L3 cache. The Intel Core Ultra X9 388H has 18 MB of shared L3 cache. AMD's L3 is more than 3.5 times larger.

Q: Which processor has integrated graphics?

A: The Intel Core Ultra X9 388H includes Arc B390 integrated graphics. The AMD EPYC 7303 has no integrated graphics listed in the database.

Architecture Differences

The two processors come from fundamentally different design philosophies. The AMD EPYC 7303 is built on the Zen 3 architecture, codenamed Milan, and uses a 7 nm process at TSMC. It is a server and workstation part designed for socketed, high-core-count deployments. The Intel Core Ultra X9 388H uses the Panther Lake architecture, also its codename, built on a 3 nm process at Intel's own foundry. It is a mobile processor on a BGA socket, aimed at laptops and compact systems.

The transistor counts differ dramatically. The EPYC 7303 packs 8,300 million transistors across a die size of 2x 81 mm². The Intel part has no transistor or die size data recorded in the database. The EPYC uses a chiplet design, which is typical for server processors, while the Intel part is a monolithic mobile design.

Cache architecture is another major divergence. The EPYC 7303 provides 64 KB of L1 cache per core and 512 KB of L2 cache per core, with a large 64 MB shared L3 pool. The Intel Core Ultra X9 388H allocates 192 KB of L1 per core and a much larger 3 MB of L2 per core, but only 18 MB of shared L3. Intel's per-core L2 is 6 times larger, which helps with latency-sensitive workloads. AMD's L3 is over 3.5 times larger, which helps with data-heavy server workloads.

Memory support is completely different. AMD uses DDR4 over an eight-channel bus, while Intel uses LPDDR5X over a dual-channel bus. The EPYC supports ECC memory, Intel does not. PCIe connectivity also differs: AMD offers Gen 4 with 128 lanes from the CPU, while Intel offers Gen 5 with only 4 lanes from the CPU. The Intel part relies on its integrated Arc B390 graphics, whereas the AMD part has none.

The production status for both is listed as Active. The AMD part was released on 2023-09-04, while the Intel part is newer, with a release date of 2026-01-04.

Specification Differences

The core and thread counts are the most obvious difference, though both chips have 16 cores. The EPYC 7303 runs 32 threads, while the Core Ultra X9 388H runs 16 threads. This means the AMD part is using simultaneous multithreading, while the Intel part is not.

Clock speeds differ substantially. The EPYC 7303 has a base clock of 2.40 GHz and a boost clock of 3.40 GHz. The Core Ultra X9 388H has a base clock of 2.10 GHz but boosts to 5.10 GHz. Intel's boost clock is 1.70 GHz higher, while AMD's base clock is 0.30 GHz higher.

Thermal design power is a major differentiator. The EPYC 7303 has a TDP of 130 watts, while the Core Ultra X9 388H has a TDP of 25 watts. That is a 105-watt difference, reflecting the server versus mobile positioning.

The sockets are incompatible: AMD uses Socket SP3, Intel uses BGA 2540. The memory bus widths differ, with AMD at eight channels and Intel at two. Memory bandwidth is 204.8 GB/s for AMD versus 153.6 GB/s for Intel. PCIe generation and lane counts also differ: AMD has Gen 4 with 128 lanes, Intel has Gen 5 with 4 lanes. Only AMD supports ECC memory, and only Intel has integrated graphics.

The AMD part carries a launch MSRP of $604. The Intel part has no launch MSRP recorded in the database. Neither processor has an unlocked multiplier. The process nodes differ as well: 7 nm for AMD, 3 nm for Intel.

Where Each One Wins

The Intel Core Ultra X9 388H wins in scenarios that favor high single-thread performance, floating-point throughput, and power efficiency. Its 65.9% lead in PassMark single-thread performance makes it the clear choice for lightly threaded applications like web browsing, office work, and general desktop responsiveness. The 44.5% lead in PassMark physics and the 42.3% lead in floating-point math point to strengths in simulation, physics-based rendering, and scientific calculations that scale well with fast cores. The multi-thread wins in Cinebench R15 and R20, plus the PassMark multi-thread test, suggest it can handle moderately parallel workloads too, despite having only 16 threads. Its 25-watt TDP makes it suitable for mobile and compact systems where cooling and battery life matter.

The AMD EPYC 7303 wins in workloads that reward massive thread counts, large caches, and high memory bandwidth. Its 55.8% lead in Cinebench R23 single-core is an outlier, but its 28.4% lead in R23 multi-core shows it can sustain heavy all-core loads. The 24.8% lead in PassMark integer math and the 18.4% lead in data compression point to strengths in database workloads, file compression, and general server tasks. The 5.5% edge in extended instructions suggests good performance with SIMD-heavy code. With 32 threads, 64 MB of L3 cache, 128 PCIe Gen 4 lanes, and eight-channel memory, this is a part designed for virtualization, large datasets, and memory-intensive enterprise workloads.

The Verdict

The data supports a straightforward decision based on platform and use case. If the workload is a mobile or compact system with tight power limits, the Intel Core Ultra X9 388H is the stronger pick. Its 5.10 GHz boost clock, 4280 PassMark single-thread score, and 112550 floating-point math score make it excellent at latency-sensitive and numerically intensive tasks, and its 25-watt TDP means it can fit in thin laptops without exotic cooling. The integrated Arc B390 graphics also removes the need for a discrete GPU in many scenarios.

If the workload is a server or workstation where thread count, memory bandwidth, and expansion capacity dominate, the AMD EPYC 7303 is the better choice. Its 32 threads, 64 MB of L3 cache, 204.8 GB/s memory bandwidth, and 128 PCIe Gen 4 lanes are server-class features. The 28.4% lead in Cinebench R23 multi-core and the 24.8% lead in PassMark integer math confirm it can handle heavy parallel and data-processing loads. The 130-watt TDP is a non-issue in a rack or tower chassis.

Both parts sit at essentially the same overall performance tier, with the EPYC at the 89th percentile and the Intel part at the 88th percentile. The average benchmark scores are close, 45960 for AMD versus 44466 for Intel, a difference of about 3.4%. The deciding factor is not raw performance but the shape of the performance. For single-threaded responsiveness, floating-point work, and mobility, choose the Intel Core Ultra X9 388H. For multi-threaded throughput, large cache workloads, and enterprise features like ECC and eight-channel memory, choose the AMD EPYC 7303.